Composite Shake Shingles Offered in New Colors

Aged Cedar

DaVinci Roofscapes launches the Nature Crafted Collection of composite shake shingles, which includes three realistic, nature-inspired colors: Aged Cedar, Mossy Cedar and Black Oak. According to the manufacturer, each new color reflects different progressive aging processes found on real shake shingles. The Nature Crafted Collection is designed to capture the look of a moment and retain it for decades. The Nature Crafted Collection is available on all DaVinci Multi-Width and Single-Width Shake composite roofing tiles.

“The DaVinci Nature Crafted Collection is our most ambitious foray into color development in our company’s history,” said Ray Rosewall, president and CEO of DaVinci Roofscapes. “Our proprietary process technology enables us to recreate the natural warmth and softness of a patina previously only created by time and exposure to the elements.”

Black Oak

The realistic-looking colors on the composite shake tiles provide homeowners with the ability to gain the specific natural color

they desire for roofing tiles without the hassles of dealing with real wood. The DaVinci shake products have a lifetime limited warranty and will not split, crack, curl or fade, according to the company. Each tile has been crafted to resist fire and impact, along with high winds, mold, algae, fungus and insects. The composite tiles come in both wavy and straight grains throughout each shake tile to achieve an authentic wood look.

Research, time and attention have been dedicated to the development of the Nature Crafted Collection to assure a unique variety of colors appealing to homeowners nationwide. “We had our teams scanning the country to identify any colors that may be missing from our current selections,” said Rosewall. “This allowed us to identify three distinct ‘aged’ cedar palettes with different tones. In most cases when real wood has aged to the point where these beautiful patinas appear, the cedar itself begins to deteriorate as a roofing material. We have captured those

Mossy Cedar

natural colors and married them up with our composite shakes to offer long-term performance without the worry of failing roof materials.”

“People who truly appreciate the natural aesthetic that comes with the aging of a cedar shake tile will find the new colors in the Nature Crafted Collection very realistic,” Rosewall said. “The hues and tones replicated on these tiles are ‘consistently inconsistent’ … much like Mother Nature makes them. The colors in the collection allow people to have the look and character of naturally aged cedar roofs but with the performance features that are missing in the real cedar product.”

LEARN MORE
Visit: www.davinciroofscapes.com
Call: (800) 328-4624

The “Roofers’ Choice” winner is determined by the product that receives the most reader inquiries from the “Materials & Gadgets” section in a previous issue. This product received the most inquiries from our March/April 2018 issue.

Three Polyiso Roof Insulation Options to Simplify Your Next Job

Pre-fabricated roof sumps direct water to a center drain point, helping to ensure proper drainage and minimizing installation time. Photos: Hunter Panels

As a roofing professional, you undoubtedly are familiar with polyiso insulation, as it is used in 70 percent or more of the commercial roofs in North America. Polyiso is popular with roofing professionals because it offers a high R-value per inch, is affordable, readily available, compatible with many roofing systems and meets both FM 4450 and UL 1256.

While you likely have specified or installed flat stock polyiso products, you might be less familiar with specialized product make-ups, which can help you simplify roof insulation jobs. Three options to be aware of are:

  1. Tapered systems
  2. Pre-cut hips and valleys
  3. Pre-fabricated sumps

Tapered Systems

As roofing professionals know, water is the enemy of the roof assembly. To prevent ponding and provide a positive slope to drain, polyiso insulation manufacturers offer sloped panels. Tapered polyiso typically comes in 4-foot-by-4-foot or 4-foot-by- 8-foot panel sizes, and in various compressive strengths. Commonly available slopes (per foot) include 1⁄16 inch, 1⁄8 inch, 3⁄16 inch, 1⁄4 inch, 3⁄8 inch and 1⁄2 inch. Tapered systems range from two-panel to eight-panel repeats, with such systems including varying thicknesses of flat polyiso insulation to complete the taper profile.

Photos: Hunter Panels

Tapered polyiso insulation installs similar to flat stock polyiso insulation, using adhesives or fasteners. As with multi-layer flat stock installations, when installing tapered products, crews should stagger the joints between layers to reduce potential pathways for airflow and condensation within the insulation layers.

Full-service polyiso manufacturers can design a tapered insulation layout based on the roof plan and specified R-value. They then will provide shop drawings showing where to place each tapered and flat stock panel to ensure positive slope and effective drainage across the entire roof.

Pre-Cut Hips and Valleys

In addition to the one-way sloped tapered panels discussed above, roofing professionals have access to pre-cut hips and valleys made of polyiso insulation. The hips and valleys help direct water on more complex roof designs. Well-equipped manufacturers will custom design and fabricate pre-cut, one-piece polyiso hips and valleys to meet your jobsite requirements including slope, and minimum and maximum thicknesses.

While crews can form hips and valleys by field-cutting tapered panels, ordering the pre-cut, one-piece panels reduces labor time and costs, as well as dumpster fees. It also prevents material waste caused by cutting errors.

Pre-Fabricated Sumps

Going a step farther in slope complexity, and further reducing ponding water, some polyiso insulation manufacturers offer pre-fabricated roof sumps. Commonly available as 4-foot-by-4 foot panels that ship flat, pre-fabricated sumps direct water from four directions to a center drain point. Some manufacturers also offer 8-foot-by-8-foot hinged sumps for greater design flexibility. All of these sumps offer a variety of starting thicknesses at the drain from 1/2 inch to 2 inches.

Choosing a Polyiso Supplier

Roofing professionals can obtain polyiso roof insulation from several suppliers. Which one is right for you? Following are a few factors to consider to help simplify your next roofing job.

  • Access to technical support: Some polyiso manufacturers provide customers with a variety of technical services. Having access to designers and estimators who work every day with specialized polyiso products takes the guesswork out of the process for you, saving time and money while helping ensure a high-quality roof.
  • Ready availability: Choosing a supplier with facilities throughout the country helps ensure timely access to specialty polyiso insulations when you need them.
  • Training support: To help your crews get up to speed faster on working with specialized polyiso roof insulation systems, look for a manufacturer that offers training support — whether via online videos, in person or on the jobsite.

Spring Forward, Fall Protect

Spring arrived late here in Michigan, and before the weather — and construction — began to heat up, I saw a press release from MIOSHA indicating the second year of its “Stop Falls. Save Lives.” safety awareness campaign would focus on the roofing industry. I called Nella Davis-Ray, Director of MIOSHA Consultation Education and Training (CET) Division in Lansing, to ask her why.

“Nationally and at the state level, we are pleased to see that overall, when you look at general industry and construction, there is a downward trend in work-related fatalities and injuries, and we like to think we play a part in that downward trend,” she said. “Even though we are seeing this downward trend, when you look at roofers’ fall-related incidents, and particularly when you look at roof-related fatalities, their rate is 10 times higher than the rate for construction workers as a whole. So, if there is any trade we can talk to about falls, the data shows the one group we should be focusing on is the roofers.”

The statistics were sobering, but the overall message was hopeful. “Our message is that all falls are preventable,” Davis-Ray said. “We really do believe that in MIOSHA.”

The key is making sure every employee is properly trained, has the proper safety equipment — and knows how to use it — and follows the jobsite-specific safety plan. According to Davis-Ray, the MIOSHA can help with all of those things — and the services are free.

The CET Division works independently of the Enforcement Division. It provides guidance to employers and employees through a variety of methods, including classroom training and educational materials including literature, videos, and a fall protection website, www.michigan.gov/stopfalls. The greatest tool of all, noted Davis-Ray, is a staff of consultants who can provide individualized training.

“I’m surprised how many employers, particularly contractors, are not aware that all they have to do is pick up the phone and call us,” she said. “At their request, we can schedule a time and location for one of our construction safety consultants to come out and work with them directly on safety and health issues.”

Consultants can review written requirements, explain interpretations of the standard, and answer specific questions about a project and whether or not a contractor might be in compliance. They can also help in crafting a comprehensive safety program. “We always try to look at the big picture,” Davis-Ray says. “The overarching issue is to have an effective system in place so that you ensure that safety is considered as a part of every contract.”

Davis urges contractors in every state to explore the free educational resources OSHA can provide. Michigan contractors can call 800-866-4674 or visit www.michigan.gov/miosha to learn more.

 

National Women in Roofing Taps Into a Powerful Force

Photos: National Women in Roofing

In 2014, an organization devoted to helping advance the careers of women in the roofing industry was just an idea. Since then, the idea has become a movement. National Women in Roofing (NWIR) was officially launched at the International Roofing Expo (IRE) in 2016. The volunteer-based organization focuses on connecting and empowering women, and it has the support of more than 1,000 members — many of them men — and nearly two dozen sponsors. They all share the goal of working together to raise the professionalism of the roofing industry, bring more people into the field, and provide the education and training necessary to ensure its future success.

This February, Heidi Ellsworth handed over the position of NWIR chair to Shari Carlozzi. The two women shared their insights on the founding of NWIR with Roofing, detailing its current initiatives and plans for the future.

A Movement Is Born

Carlozzi and Ellsworth first discussed the idea of an organization to support women during a break at a meeting of the Midwest Roofing Contractors Association in 2014. As they shared their thoughts about working in a male-dominated industry,

Officers and directors of National Women in Roofing include (from left) Jennifer Stone, vice chair, executive committee; Jennifer Ford-Smith, secretary; Ellen Thorp, executive director; Shari Carlozzi, chair, executive committee; and Heidi Ellsworth, past chair, executive committee. Photos: National Women in Roofing

a light bulb went on. “We started talking, and we realized there are a lot more women in this industry than people give it credit for,” Carlozzi says. “There’s a lot of women! And we said, ‘We should start an organization where women can gather to network, to learn from each other, to mentor one another, and to help empower each other’ — because we are in an industry that we love.”

Ellsworth and Carlozzi shared the concept with Steve Little of Dallas-based KPost, who was then MRCA president. “He said, ‘That’s a great idea! We’ll help incubate you.’ And that’s how we got started,” Carlozzi remembers. “It went viral.”

As they traveled the country in their respective work roles — Ellsworth as a partner in RoofersCoffeeShop.com and Carlozzi as national sales manager for HAPCO Inc. — they soon realized that a lot of other women had the same needs. Many were even exploring the same idea. “At every trade show we went to, both of us would hear this from so many women,” Ellsworth says. “They would say, ‘We need to spend time together. We need to network.’ And networking is a big one because it’s sometimes a lot easier for guys to get together to network and women are left out. It was something that a lot of women truly believed in.”

Shari Carlozzi thanks the founding sponsors of the organization at NWIR Day. Photos: National Women in Roofing

After talking to others in the industry, it became clear the organization had to have a national presence. “We looked ahead to the IRE in New Orleans in 2015 and decided to have a little get-together and see if people are truly interested,” Ellsworth recalls. “We had 75 women show up. It just grew from there.”

The group formed a leadership committee and held meetings at industry trade shows throughout 2015. “It was at IRE in 2016 that we officially launched National Women in Roofing,” Ellsworth says. “We realized very quickly that there was a tidal wave — a tsunami — of women behind us who really needed this. We realized we had to take this to a national level, and we did.”

The Four Pillars

Overarching goals of the organization are exemplified by its four pillars: networking, mentoring, education and recruitment.

Heidi Ellsworth welcomes attendees to the inaugural NWIR Day, held February 4, 2018. Photos: National Women in Roofing

“Our four pillars we started with — networking, mentoring, education and recruitment — have been the focus of what we’ve wanted to do from the start,” Carlozzi says. “Some people are a little bit more involved in education, some people are a little bit more involved in networking — it all depends on what works for you. We’ve stayed true to our four pillars, and that has been extremely helpful in giving women opportunities to engage in what’s most important to them.”

Ellsworth agrees, pointing out that networking events and mentoring initiatives developed hand in hand. “Our first events were networking events,” she says. “One of our themes is ‘from the rooftop to the boardroom,’ and we had top leaders at companies including GAF, ABC, Owens Corning, Johns Manville — all of these ladies showed up early and then stayed on and helped to drive this. We partnered with 28 founding sponsors that first year.”

Mentoring relationships seemed to blossom. “I wish we could all take credit for it, but it just happened so naturally,” Ellsworth says.

Kelly Wade, CEO of North American Roofing, gives the keynote address at the National Women in Roofing’s Mentor Reception during the 2018 International Roofing Expo. Photos: National Women in Roofing

NWIR is launching a mentoring program this year, under the leadership of Mallory Payne and Melissa Walker, who head up the mentoring committee. “Mentoring has always been a big part of what we do,” Carlozzi says. “Men have more mentors than women do, and we want to change that.”

The education committee, led by Shelly Duhaime and Jennifer Keegan, is working on a full slate of educational sessions at industry events, as well as a series of webinars on topics such as networking, safety and business management. “Our education committee is on fire this year,” says Carlozzi. “People crave information. The only way we can excel in what we do is to keep learning.”

Carlozzi points to the NRCA’s ProCertification program as a model for educating the industry’s workforce and boosting professionalism. “We have to elevate the perception of the roofing industry,” she says. “We share the same values as the NRCA, and we want to speak with one voice to get the message across to people that this is a viable career option for you, whether you are a man or a woman in the trade, or whether you are looking for a career as a chemist, or an engineer, or a salesperson, or in data entry. It is a solid, reputable industry.”

It’s also an industry facing a worker shortage, so recruiting a new generation of workers is essential. The recruitment committee, led by Michelle Boykin and Chelsea Welsh, is active at employment fairs and career days, and NWIR is reaching out to other trade groups across the country to increase the visibility of the industry.

Part of the recruitment effort includes a commitment to helping women in crisis find employment and pursue a true career path.

Memberships and Sponsorships

The organization might be national, but it is also active at the local level. NWIR is developing councils across the country to cater to local educational needs and reach out to area community service opportunities. There are 29 local councils now, with a goal of reaching 50 by the end of 2018.

NWIR members participate in a breakout session at a mentoring workshop. Photos: National Women in Roofing

“It’s the best of both worlds for everybody because they get that national input through our epicenter — our newsletter and our website — and they can apply the information to what they are doing locally,” Carlozzi says. “We give local councils a lot of latitude to put together what works for them as long as they stay true to our four pillars and our national outreach program with women in crisis.”

Carlozzi and Ellsworth encourage all women and men to join the association. The membership fee is $60 per year. Half of the membership fee goes to develop and support local councils. “We made a very conscious decision to keep our membership dues very reasonable, and they are owned by the member,” Ellsworth notes. “If your career path takes you to another company, the membership goes along with you.”

Companies can help NWIR as sponsors. There are four levels of sponsorships. “We are also in the middle of our sponsorship drive, and that is a great way to get involved as a company,” Ellsworth says. “The value to the company — and its employees — is incredible.”

A Bright Future

Looking back at her tenure as the first chair of the organization, Ellsworth is proud of the group’s achievements and thankful for the friendships she’s made along the way. “It’s one of the greatest experiences I’ve had in my life,” she says. “The women I have met and the experiences we’ve had have been so empowering.”

Networking and mentoring have always been key areas of focus for NWIR members. Photos: National Women in Roofing

As Carlozzi takes the helm, she plans to lean on the talented team of women ready to take the organization into the future. “It’s a little overwhelming when you look at it at first because we came so far, so fast, and we have to keep that momentum going,” says Carlozzi. “In the process, we’ve had some exceptional, outstanding women who have stepped up and taken on the leadership roles that are needed to develop and maintain a national organization like this.”

When the industry taps into everyone’s talents, everyone wins. Carlozzi sees that spirit every day at NWIR. “Everyone comes up with new ideas of how to make things better,” she says. “Everyone is open to new ideas and assistance, and everyone is freely offering it. No one feels threatened — we’re all empowered. That’s the beauty of it.”

For more information about NWIR, visit www.nationalwomeninroofing.com.

Ponding Water Basics: Proper Drainage Design and Low-Slope Roofs

Roofing professionals install a new asphalt roof on the Broward County Stephen Booher Building in Coral Springs, Florida. Photo: Advanced Roofing Inc.

A low-slope asphalt roofing system is cost effective, durable and reliable. Multiple layers of weatherproof membranes protect a building, its residents and the property it houses. There are a few design elements that will help building owners get the most from their roofing system. Managing ponding water is essential to properly maintaining a roof.

Ponding water is defined as the water which remains on a roof 48 hours or longer. Water may accumulate on a low-slope roof due to rain, snow or runoff from rooftop equipment. Ponding water can have major negative consequences, regardless of the type of roofing system. Proper design, installation and maintenance of roofing structures can prevent this condition and its associated problems.

The adverse effects of ponding water on roofs can include:

  • Deformation of the deck structure:Ponding water can substantially increase the load on roof decks. As water accumulates, deck deflections can increase, thereby resulting in additional ponding water, which could compromise the structural integrity of the deck.
  • Damage to the roof surface:Ice formations develop and move constantly with changes in temperature. This movement can “scrub” the roof membrane to such an extent that considerable physical damage to the membrane can occur.
  • Growth of algae and vegetation:When water stands for long periods of time, algae and vegetation growth will likely occur, and may cause damage to the roof membrane. Additionally, vegetation can clog drains and cause additional ponding.
  • Accumulation of dirt and debris in the ponding area:Dirt, debris, and other contaminants can affect and damage the membrane surface. The can also lead to clogged drains.

Proper design and installation are crucial factors in roof system performance. This photo shows an Atactic Polypropylene (APP) modified bitumen membrane being applied by torch to a low-slope roof. Photo: ARMA

Ponding water may lead to accelerated erosion and deterioration of the membrane surface that can result in failure of the roof system. Allowing even relatively small amounts of moisture beneath the roof membrane may reduce the thermal efficiency of the insulation. More importantly, moisture intrusion can cause serious damage to the deck, insulation, and membrane as well as the building’s interior.

The Asphalt Roofing Manufacturers Association (ARMA) recommends that roof designs provide adequate slope (minimum of ¼ inch per foot) to ensure that the roof drains freely throughout the life of the building and to thereby avoid the effects of ponding water. Model building codes also require a minimum ¼ inch per foot slope for new construction projects, and require positive drainage for re-roofing projects. These requirements are intended to prevent water from ponding on roof surfaces.

Managing Ponding Water

Here are a few best practices to manage ponding water:

  • Adequate sloping should be taken into account during the design process. A roof’s structural frame or deck should be sloped, and drainage components like roof drains and scuppers should be included in the design.
  • In addition, secondary (or emergency) drains may be required by local plumbing codes to help reduce the risk of a structural failure due to clogged drainage systems. Talk to your roof membrane manufacturer and/or roof system designer to determine the proper location of these components.
  • If a deck does not provide the necessary slope to drain, a tapered insulation system can be used. A combination of different approaches — single slope, two-way slope, and four-way slope — is often used to achieve the necessary slope and to allow for moisture drainage.
  • Additionally, crickets installed upslope of rooftop equipment and saddles positioned along a low-point between drains, can help prevent localized ponding in conjunction with a tapered insulation system.
  • Building designers and owners should work with contractors and roof manufacturers to determine which methods are best and appropriate for a roof assembly’s long-term performance, whether it’s a new construction or re-roof project.

The NRCA Roofing Manual: Membrane Roof Systems—2015, states the following: “NRCA recommends that designers make provisions in their roof designs for positive slope.”

The manual spells out that slope generally is provided by:

  • Sloping the structural framing or roof deck
  • Designing a tapered insulation system
  • Proper location of roof drains, scuppers and gutters
  • A combination of the above

By following the proper drainage practices detailed above, building owners can positively impact their low-slope roofing system and help to ensure it will remain durable and reliable throughout its service life.

To obtain specific information about ponding water on particular products and systems, contact your roof material manufacturer. For more information about low-slope asphalt roofing systems, visit www.asphaltroofing.org.

Proper Storage and Handling of Polyiso Insulation

Photo: SOPREMA

Punxsutawney Phil certainly got it right this year; we have had six more weeks of winter — and then some — particularly in the Northeast. As winter turns to spring, building and repair projects which frequently involve the roof get underway. As you commence these new and re-roofing initiatives, here are a few key considerations about the storage and handling of polyiso roof insulation on a jobsite.

Storage

Polyiso insulation is typically shipped protected by a plastic wrap, plastic bag or both. This factory packaging is intended for handling the polyiso in the manufacturing plant and during transit; it should not be relied upon as protection at jobsites or other outdoor storage locations unless specified otherwise by the manufacturer.

Material delivery should be carefully coordinated with the roof application schedule to minimize outdoor storage. When short-term outdoor storage is necessary, whether at grade or on the roof deck, the following precautions should be observed:

  • Bundles should be stored flat above the ground utilizing included feet or on raised pallets. If possible, the bundles should be placed on a finished surface such as gravel, pavement, or concrete rather than on dirt or grass.
  • Unless specified otherwise by the manufacturer, cover the package and pallet with a waterproof cover, and secure to prevent wind displacement.

Note: Polyiso insulation is fully cured and fit for installation upon delivery. No additional storage time is required.

Handling

Photo: Johns Manville

Exercise care during handling of polyiso insulation to prevent breaking or crushing of the square edges and surfaces. Remove the polyiso bundles from trucks with proper equipment. Other means of mishandling, such as pushing pallets off the edge of the truck or “rolling” the pallet across the roof deck, must be avoided.

Product Application

Polyiso should always be installed on dry, clean roof decks in dry conditions. Follow the manufacturer’s recommendations regarding product application to ensure performance to the intended design life of the roofing system. Apply only as much polyiso roof insulation as can be covered by completed roofing the same day.

Construction Traffic

Avoid excessive traffic during roof construction of or on a completed roof surface. Although polyiso has been designed to withstand limited foot traffic, protection from damage by construction traffic and/or abuse is extremely important. Roof surface protection such as plywood should be used in areas where storage and staging are planned and heavy or repeated traffic is anticipated during or after installation.

Photo: Johns Manville

Some designers and membrane manufacturers specify the use of cover boards as a means of protecting the insulation. If specified, installers should ensure the cover board used is compatible with all components of the roofing system, is acceptable to the membrane manufacturer, and meets specified fire, wind, and code requirements.

Polyiso roof insulation, like other roofing materials, requires a proper understanding of storage, handling, and application to result in a properly constructed roof system. To find additional information about the proper storage and handling of polyiso insulation and for more technical information on polyiso roof and wall insulation, please visit www.polyiso.org.

Custom-Engineered Accessories Available for KnuckleHead Rooftop Supports

Green Link introduces a family of custom-engineered, molded straps and caps for securing pipes and struts for its KnuckleHead rooftop support product line. Straps have been designed for both Heavy Pipe and Strut Support KnuckleHeads, while a cap design was developed for Lite Pipe Supports. All are molded from tough, weatherproof urethane and feature a striking “safety yellow” color.

The Heavy Pipe KnuckleHead strap secures a 3-inch outside diameter pipe, while the Strut Support strap fits steel or aluminum Unistrut-type channel. The Lite Pipe Support cap is designed to secure a single 1-inch nominal pipe or two 1/2-inch nominal pipes. Pipe supports are attached with standard stainless-steel sheet metal screws, which are supplied with the heads. The Strut Support straps are available in nominal pipe sizes ranging from 1/4 inch to 6 inches. Custom straps are available by special order. These elastomeric straps slide into the strut channel and snap in place, eliminating the need for screws.

“We custom engineered these products to fit the unique shape of our head designs,” said Ondrej Pekarovic, Green Link design engineer. “There is growing interest in securing rooftop mechanical installations in the face of high wind conditions and seismic events. These straps will greatly increase the stability of pipes, conduit, channel and related mechanical equipment. Additionally, they satisfy local code requirements.”

LEARN MORE

Visit: www.greenlinkengineering.com
Call: (888) 672-9897
Email: sales@greenlinkengineering.com

IRE and R&D

The conventional wisdom is that when the overall economy is strong, manufacturers feel more comfortable investing their resources in research and development of new products. I don’t have hard numbers to back that assertion up, but in my experience, at least anecdotally, it seems to be borne out. During the Great Recession years of the last decade, the number of new products coming to market seemed to decline. If the array of new products I saw at this year’s International Roofing Expo (IRE) in New Orleans is any indication, we could be in for a banner year.

The IRE makes it easy to keep tabs on new developments with its New Product Pavilion. The depth and breadth of offerings in that area was impressive, but I saw products being unveiled all over the show floor. Time will tell if they will turn out be a flash in the pan, a category-changing development, or something in between — but for the Roofing team, it was a very interesting show to cover, as there were a lot of excited responses when we asked, “What’s new?”

Innovative products on display included a pre-weathered fastener from Lakeside Construction Fasteners that matches aged Corten panels, so installation and repairs don’t leave bright silver dots on the rust-colored surface.

Carlisle showcased its Rapid Lock Technology, which uses a Velcro attachment system to secure the company’s EPDM and TPO membranes without using a bonding adhesive, doing away with temperature restrictions.

OMG Roofing Products unveiled its RhinoBond Hand Welder, which can be used to install the company’s induction welding fastening system in hard-to-reach areas, such as spaces below signs, pipes and rooftop equipment.

Georgia-Pacific showed off enhancements to DensDeck Prime that make the cover boards more resistant to water and increase their vertical pull strength.

Roof Sentry announced the launch of a solar-powered roof vent that provides moisture detection and data monitoring services. It can also remove moisture from low-slope roof systems.

On the residential side, new developments included GAF’s shingles with StainGuard Plus, which uses copper granules with time-release technology to fight algae growth.

Tie Down Engineering offered the Ergo Stripper, an ergonomically designed tool for removing shingles that improves leverage and eases strain on the back.

The Roof Umbrella rooftop canopy system is designed to be installed in less than 30 minutes on jobsites to prevent weather delays. It can be customized with the contractor’s logo.

These are just a few of the items that caught our eye at the IRE. We will be showcasing them in this issue and future issues of the magazine as part of our editorial mission to keep readers up to date on new products hitting the market. If you saw a new product you’d like us to be aware of, just email me at chris@roofingmagazine.com.

New Commercial Insulation Board Designed for High Load-Bearing Applications

Kingspan Insulation has expanded its commercial product offering by introducing GreenGuard Type VII XPS Insulation Board. The product is designed for high load-bearing engineered applications requiring insulation with a minimum compressive strength of 60 psi. According to the manufacturer, Type VII XPS is primarily used in commercial roofing applications, such as protected membrane and pedestal paver systems.

According to the manufacturer, the insulation board offers an R-value of 5.0 per inch of thickness and meets ASTM C578 Type VII requirements. The product retains its insulating properties over time, has high water resistance and is HCFC-free. In addition to commercial roofing applications, it also is suitable for low-temperature freezer floors, cold-storage facility floors, ice rinks and parking decks.

“Kingspan continues to be committed to our customers and expanding our product offerings to the North American market,” said Ryan Sullivan, managing director, Kingspan Insulation North America. “Our recent investment into a new, state-of-the-art XPS insulation manufacturing line is allowing us to increase capacity and expand our GreenGuard XPS product portfolio to include insulation board with higher compressive strengths.”

Kingspan Insulation has expanded its commercial product offering by introducing GreenGuard Type VII XPS Insulation Board. The product is designed for high load-bearing engineered applications requiring insulation with a minimum compressive strength of 60 psi. According to the manufacturer, Type VII XPS is primarily used in commercial roofing applications, such as protected membrane and pedestal paver systems.

According to the manufacturer, the insulation board offers an R-value of 5.0 per inch of thickness and meets ASTM C578 Type VII requirements. The product retains its insulating properties over time, has high water resistance and is HCFC-free. In addition to commercial roofing applications, it also is suitable for low-temperature freezer floors, cold-storage facility floors, ice rinks and parking decks.

“Kingspan continues to be committed to our customers and expanding our product offerings to the North American market,” said Ryan Sullivan, managing director, Kingspan Insulation North America. “Our recent investment into a new, state-of-the-art XPS insulation manufacturing line is allowing us to increase capacity and expand our GreenGuard XPS product portfolio to include insulation board with higher compressive strengths.”

LEARN MORE

Visit: www.kingspaninsulation.us
Call: (678) 589-7320
Email: info@kingspaninsulation.us

Building to Last With Asphalt-Based Roofing

The property owner of this building opted for a BUR/modified-bitumen hybrid system with reflective white coating. Photos: Johns Manville

The advantages of a built-up roofing (BUR), modified bitumen, or hybrid roofing assembly include long life, a variety of maintenance options, and outstanding puncture resistance. This durability means property owners will spend less time worrying about fixing leaking roofs and the associated hassles — lost productivity, disruption in operations, slips and falls, repair bills, and other liabilities.

Recommending clients install a roof system that gives them the best chance of eliminating unproductive distractions is a good business decision for design/construction professionals. A more durable roof will enable property owners to focus on making profits instead of dealing with the aftermath of a roof leak.

“I have no problem endorsing asphalt-based roofing,” says Luther Mock, RRC, FRCI and founder of building envelope consultants Foursquare Solutions Inc. “The redundancy created by multiple plies of roofing is really what sets systems like BUR and modified bitumen apart.”

One can argue BUR’s closest cousin — the modified bitumen (mod bit) assembly — is actually a built-up roof made on a manufacturing line. The reality is the plies of a BUR create a redundancy that can help mitigate any potential oversights in rooftop workmanship.

BUR systems are offered in a variety of attractive and reflective options with a proven track record of performance. Photos: Johns Manville

“I’ve replaced BURs for clients I worked with 30 years ago,” says Mock. “We recently replaced [a BUR] specified in the early 1980s. And the only reason was because some of the tectum deck panels had fallen out of the assembly. Meanwhile, the roof was still performing well after 30 years.”

According to the Quality Commercial Asphalt Roofing Council of the Asphalt Roofing Manufacturers Association (ARMA), one of the main drivers of the demand for BUR systems is the desire of building owners for long life cycles for their roofs.

“A solid core of building owners and roofing professionals in North America continue to advocate asphalt-based roofing systems because of their long lives,” says Reed Hitchcock, ARMA’s executive director.

Benefits of Asphalt-Based Roofing

Over the years, asphalt-based roofing assemblies have earned a reputation for reliability with building owners, roofing consultants, architects, engineers, and commercial roofing contractors. The original price tag tends to be greater than other low-slope roofing options, but these assemblies offer competitive life-cycle costs. BUR enjoys a track record spanning more than 150 years; it provides a thick, durable roof covering and can be used in a broad range of building waterproofing applications.

An aerial view of a reflective roof membrane. Photos: Johns Manville

Available as part of fire-, wind-, and/or hail-rated systems, BUR and modified bitumen assemblies offer proven waterproofing capabilities, high tensile strength, long-term warranties, and a wide choice of top surfacings (including ‘cool’ options). Their components include the deck, vapor retarder, insulation, membrane, flashings, and surfacing material. The roofing membrane can be made up of a variety of components, including up to four high-strength roofing felts, modified bitumen membranes (hybrid systems) and standard or modified asphalt. Hot-applied asphalt typically serves as the waterproofing agent and adhesive for the system.

The roofing membrane is protected from the elements by a surfacing layer — either a cap sheet, gravel embedded in bitumen, or a coating material. Surfacings can also enhance the roofing system’s fire performance and reflectivity ratings.

Another surfacing option is gravel, commonly used in Canadian applications where the existing roof structure can handle the extra weight. There are also several smooth-surface coating options, the most popular of which are aluminum or clay emulsion products offering greater reflectivity than a smooth, black, non-gravel-surfaced roof. These reflective roof coating options are typically used in warmer regions when required by code. Reflective white roof coatings are also becoming more popular.

Cold-Process BUR

Cold application of BUR has provided an alternative to traditional hot-applied systems for more than 48 years. The term ‘cold-applied’ means the BUR roofing system is assembled using multiple plies of reinforcement applied with a liquid adhesive instead of hot asphalt. These cold adhesives are used between reinforced base/ply sheets to provide a weatherproof membrane.

The owner of this shopping mall chose BUR primarily due to its redundancy. Multiple plies of roofing can provide extra insurance against water intrusion. Photos: Johns Manville

In BUR cold-process roof systems, manufacturers typically require that only fully coated, non-porous felts (such as standard base sheets) are used as base and ply sheets. Generally, an aggregate surfacing or a coating is then applied over the completed membrane to provide surface protection and a fire rating for the roof system.

“In the re-roofing market, we’re definitely seeing more cold-applied systems being specified, particularly with modified bitumen,” says Mock. “It’s a natural alternative when a building may be occupied during the reroofing process and hot asphalt is not an option.”

Adhesives can be manually applied with a squeegee, brush, or spray application equipment. When numerous roof penetrations or rooftop access become issues, manual application of adhesives is usually the best option. Proper coverage rates are vital to a successful, long-term, cold-applied roof system. Both spray and manual application methods require the proper amount of adhesive material be installed. If too little adhesive is applied, there is a potential for an improper bond to be formed between the felts. If too much is applied, then the potential for longer setup times and membrane slippage is increased. Additionally, ambient temperatures must be 40 degrees Fahrenheit (5°C) and rising before installation. This limits, but does not preclude, use of cold-process BUR in much of the northern United States and Canada.

“I’m also comfortable specifying BUR, because I’m confident I will have a seasoned contractor on the job,” says Mock. “The commitment in terms of skilled labor and equipment is simply too great for these contractors to be first-timers.”

Flashings are another critical component of every roofing system, particularly in cold-weather applications. Four-ply BURs use modified bitumen flashings almost exclusively. These membranes are predominantly styrene butadiene styrene (SBS)-modified and offer greater elongation in frigid climates where it counts most — at the interface of the roof system with other building components.

Use of a modified-bitumen base ply is one way of handling general flashing requirements, although modified bitumen cap sheets are more common.

BUR Repair and Maintenance

Like all roof systems to some extent, the life expectancy of a BUR system depends on the property owner’s commitment to routine maintenance. All roof systems can benefit from an owner willing to undertake a proactive management plan. BUR installed over an insulation package lends itself well to non-destructive testing in the future (e.g., infrared) as a means to maximize service life.

“Asphalt roofing systems have the potential for a very long life, and preventive maintenance is the key to realizing that potential,” says Hitchcock.

Non-gravel BUR surfacing options include aggregate, a mineral surface cap sheet, or a smooth, surface-coated membrane. Photos: Johns Manville

The goal is for problem areas to be detected and fixed before they develop into leaks. Inspections can reveal potentially troublesome situations, such as a loss of gravel surfacing, which could lead to felt erosion or brittleness. Less commonly, punctures and cuts to the membrane can occur, so it is wise to remove sharp objects and debris from the roof. Clogged drains or poorly sealed flashings also present problems that are repaired easily. The effects of chemical exhausts on roofing materials should also be monitored.

Preventive maintenance actions can help catch problems before they damage larger areas of the roof system. Inspections should be performed not only on aging roofs, but also on newly-installed roofs to guard against errors in installation, design, or specifications.

BUR and modified bitumen also have a long history of proven performance in the northern United States and Canada, where snow and ice buildup are common. Perhaps more than any other roof membrane, the BUR system shrugs off minor abuse.

BUR has proven to be a low-maintenance roofing system, and it can also be effectively repaired when needed. This means property owners can usually get more life out of a BUR. The ability to enhance the performance of existing BUR membranes with coatings, mod bit cap sheets, or flood coats of asphalt explain the long service lives of these systems in demanding applications.

“Property owners rarely have to replace a four-ply BUR until it is absolutely, positively worn out,” says one roofing contractor who asked to remain anonymous. “Based on experience, these asphalt-based systems ‘hang in there’ longer than less-robust roof options.”

When BUR Is Not the Best Option

There is no roofing product solution that will fit every building specification, and that certainly holds true for BUR. Probably more than any other roofing system (except spray polyurethane foam), the built-up roofing application is more of a skill than a science. As alternative systems have been introduced into the market, the job of finding experienced BUR contractors has become more difficult. This is especially true for the hot mopping of multi-ply BUR systems.

BURs are labor intensive and their installed cost will fluctuate with crude oil prices. However, as oil prices have continued to fall, BUR manufacturers have enjoyed the lowest asphalt pricing since the 2008-09 recession. (The price of oil peaked at about $117 a barrel in September 2012 and is $50 a barrel at this writing.) Typically BUR manufacturers will pass on a portion of these savings to their customers.

BUR has always held up well in life-cycle cost analyses. However, if a roof is not expected to last 20 years or more, it usually does not make sense to specify a premium four-ply BUR.

On larger projects, gravel-surfaced BURs are typically not practical from a cost standpoint unless a source of gravel is available locally. Projects where roof access is difficult often present challenges when roofing kettles are used. And despite the preponderance of low-fuming asphalts and kettles, re-roofing occupied buildings is often unacceptable to neighbors and/or the property owner.

Built-up roofing systems have sufficient strength to resist normal expansion and contraction forces that are exerted on a roof; however, they typically have a low ability to accommodate excessive building or substrate movement. Rephrased, if the roof must be used to “hold the walls” together or if the use of “loose-laid insulation” has a benefit, then a traditional three- or four-ply built-up roofing system is not a good choice.

A built-up roof typically provides high tensile strength with low elongation. Guidelines about where expansion joints should be installed in the roofing system should not be ignored by the designer. These guidelines include installing expansion joints where the deck changes direction, approximately every 200 feet (61 meters), although many consider that this dimension can be expanded for single-ply roofing membranes; where there is a change in deck material; and, anywhere there is a structural expansion joint, etc. Based on these requirements, on some projects it simply isn’t practical to use a BUR.

BUR materials must be kept dry before and during installation to prevent blistering in the roof system. Proper storage is the key: Do not overstock the roof; use breathable tarps to cover material on the roof; store material on pallets to minimize the possibility of material sitting in water; and store rolls on-end to prevent crushing. In general, polymeric single-ply membranes like TPO (thermoplastic polyolefin) are less susceptible to storage issues.

Many roof consultants and product manufacturers clearly state that there should be no phased construction of a built-up roof. If phasing is required, then a BUR should not be specified. This is a clean and simple rule to understand; if the roof being constructed is a four-ply BUR, then only as much insulation should be installed as can be covered the same day with all four of the plies in the built-up roofing membrane. Phased construction of a built-up roof greatly increases the potential for blistering of the membrane and does not allow for the total number of plies to be installed in a shingled fashion. Phased application contains other perils, such as roofing over a small amount of overnight precipitation or dew that, even with the best of intentions, can cause harm.

As stated above, costlier modified bitumen materials should be specified for flashings and to strip in metal. Stripping in two plies of felt will most likely result in splitting at the joints in a gravel stop because the two-ply application cannot accommodate the movement in the edge metal. On new or existing buildings where significant expansion/contraction is expected, a TPO, PVC or EPDM roof membrane can save the property owners money and eliminate premature roof failure due to roof splitting.

Conclusion

Manufacturers across North America are making asphalt roofing systems like BUR better and more versatile for architects, builders, contractors, roofing consultants, and building owner/managers. Thanks especially to the addition of polymers that add stretch and strength, architects can now specify a commercial, low-slope roof as part of a multi-ply BUR system any way they want it — hot, cold, torch, or self-adhered (hybrid BUR) — to meet the individual low-slope roofing project’s needs.

Most importantly, asphalt-based roofing products offer exceptional life-cycle cost performance. They have proven to be reliable, easy to maintain, and are trusted to perform exceptionally well in extreme weather conditions.