Building owners and Building Teams seeking sustainable, aesthetically pleasing roofing solutions are turning to metal for its favorable life cycle benefits, longevity, and resistance to wind uplift, fire, and physical impact.
While metal is typically specified for new construction, it has significant potential for growth in retrofits. “Metal adds insulation, a ventilated cavity, and a reflective coating that makes the [old] roof several hundred percent more energy efficient,” says Chuck Howard, PE, of Metal Roof Consultants, Cary, N.C. “And the roof panels can last well over 60 years.”
Moreover, the installation cost of a metal roof is estimated to be comparable to tearing off and replacing the existing flat roof, says Ken Buchinger, vice president of R&D and business development for Houston-based manufacturer MBCI.
Metal roofing is unquestionably more design-friendly than it was 25 years ago. While steel remains the dominant material, metal roofing can also be fabricated from aluminum, copper, and zinc. Building Teams can dress it up with such features as dormers, Dutch hips, and offset ridges with clerestories. Many panel profiles and paint colors are available, as well as finishes that emulate copper, aluminum, stone, brick, and glass.
Thanks to more advanced manufacturing equipment, metal can be curved, tapered, and perforated in a variety of ways, says Dave Brown, director of new product development for Euramax International’s North American Commercial Division, Lancaster, Pa. Euramax is the parent company of Fabral Metal Roof and Wall Systems.
Brown urges designers to review drawings and specifications with the roofing manufacturer early on in the process. According to architect Mickey Conrad, AIA, “Metal roofs are great, but you can design yourself into a flashing and waterproofing jam if you’re not careful about how different roof forms intersect.”
Six things you should know about using metal roofing
1. If the roof geometry of your project is complicated, request a weather-tightness warranty from the manufacturer. Such warranties call for multiple roof inspections throughout the installation process.
2. Metal roofing is an especially good substrate for solar installations because it requires no roof penetrations. With proper maintenance, the roof should outlast the solar array.
3. Insulated metal roof panels eliminate the need for highly skilled labor on site and can be installed quickly.
4. In retrofits, if a metal roof is installed over the existing roof, the new framing will create a ventilated cavity that can be insulated to reduce the building’s energy consumption.
5. Architects can get the maximum creativity out of their roof design by working with the manufacturer in the early stages of a project.
6. Consult with the manufacturer for a recommendation on the right installer for the job.
Conrad, principal-in-charge of OCO Architects, San Antonio, Texas, prefers vertical standing-seam metal roofs with concealed fasteners: “They’re going to give our clients the best performance over many years.”
Insulated metal roof panels could become more widespread as Building Teams strive for LEED points. Doug Pickens, vice president of marketing for IMP roofing manufacturer Metl-Span, Lewisville, Texas, says the volume of IMPs sold in the U.S. and Canada has doubled in the last three years, even though IMP systems cost twice as much as single-ply or standing-seam metal roofing.
Because they have insulating foam sandwiched between two layers of metal, he says, IMPs provide an air and vapor barrier with no thermal bridging. “The insulation is continuous across the entire roof,” says Pickens. “The panels go down incredibly fast. A contractor who has a little bit of experience can put down as much as 10,000 sf a day with a five-man crew and a crane.”
Let’s take a look at how metal systems have been used in three different kinds of applications.
1. METAL ROOF MAKES A SPLASH
The new water park at Hope Lake Lodge in Virgil, N.Y., has transformed the resort into a year-round destination. By installing a metal roof, the owners of the water park have been able to maintain its interior temperature at 80-84°F, even during the coldest months.
VIP Structures, Syracuse, N.Y., erected the building and installed 60,000 sf of Metl-Span insulated roof and wall panels. The steep roof, with its 100-foot-long skylight at the ridge line, was something of a challenge, but the crew successfully managed the hips, valleys, and trim, according to Leonard Pogroski, project manager for VIP Structures.
The LEED Silver project was designed by RBA Group, Charlotte, N.C. “By using a steel superstructure with insulated panels, we were able to create the large clear spans necessary for housing the water-park features and provide high thermal efficiency,” says architect Steven E. Finch, LEED AP, Assoc. AIA, RBA’s director of hospitality. IMPs were also chosen because they permitted multiple punched openings where the waterslide chutes exit and reenter the building, according to Finch.
2. RETROFIT HELPS DRY OUT SCHOOL ROOF
During its 42 years of service, the BUR roof of Winchester High School in Richmond, Ind., had been patched numerous times, but continued to leak. Students and teachers regularly complained about the wet, humid environment and unpleasant odor.
The school board considered a flat-roof retrofit, but parents and students protested so vehemently that the board called in Metal Roof Consultants. MRC proposed installing a sloped metal roof over the existing flat roof. This meant that there would be no interruption of school activities.
Six inches of unfaced fiberglass insulation were installed directly over the existing roof, raising insulating value from R-3.5 to R-22.5. The existing roof was able to release its moisture through the insulation into the new roof cavity, where it was expelled through side vents. “The classroom wing was the wettest, so we worked on that first,” says MRC’s Howard. “It dried out in less than a year.”
Energy Star paint additives create a cool roof that reflects approximately 80% of the solar heat back into the atmosphere. Howard says the roof system is warranted against leaking for 20 years but should provide 50-60 years of service, with no maintenance other than periodic checks for external damage.
Smarrelli General Contractor, Richmond, Ind., used MBCI’s NuRoof system, in which light-gauge steel framing is installed over existing framing members to create a sloped plane. BattenLok HS standing-seam panels were installed over the framing. Steve Shute, Smarrelli’s general manager, says the manufacturer made the project, even with its high load conditions and roof curbs, “work very well.” Most important, there haven’t been any leaks.
3. ROOFTOP SOLAR ADDS TO SUSTAINABILITY
When the city of Allegan, Mich., had to upgrade its water-treatment plant, it rejected a costly retrofit and decided instead to build a new reverse-osmosis facility. The $10 million project, funded by federal grants and a low-interest loan from the state, includes a half-million-gallon ground storage tank, an on-site mixed-oxidant generation system, and a rooftop solar system.
Architect/engineer Prein & Newhof, Grand Rapids, Mich., specified Fabral’s Solar SSR, which integrates flexible thin-film solar laminates with a standing-seam metal roof. Once the wood-truss framing and sheathing were in place, Erhardt Construction, Ada, Mich., installed the roof and solar array, which generates 29.38 kW of electricity.
Dave Brown of Euramax, Fabral’s parent company, says thin-film laminates are lightweight and flexible and achieve high relative efficiency under high temperatures and low light. “No roof penetrations or additional structural support are needed, and you can walk on the laminates,” says Brown. He says the panel/laminate bond has been proven to withstand 160 mph winds. +
Related Stories
| Dec 29, 2014
14 great solutions for the commercial construction market
Ideas are cheap. Solutions are what count. The latest installment in BD+C's Great Solutions series presents 14 ways AEC professionals, entrepreneurs, and other clever folk have overcome what seemed to be insoluble problems—from how to make bricks out of agricultural waste, to a new way to keep hospitals running clean during construction.
| Dec 29, 2014
HealthSpot station merges personalized healthcare with videoconferencing [BD+C's 2014 Great Solutions Report]
The HealthSpot station is an 8x5-foot, ADA-compliant mobile kiosk that lets patients access a network of board-certified physicians through interactive videoconferencing and medical devices. It was named a 2014 Great Solution by the editors of Building Design+Construction.
| Dec 28, 2014
Robots, drones, and printed buildings: The promise of automated construction
Building Teams across the globe are employing advanced robotics to simplify what is inherently a complex, messy process—construction.
BIM and Information Technology | Dec 28, 2014
The Big Data revolution: How data-driven design is transforming project planning
There are literally hundreds of applications for deep analytics in planning and design projects, not to mention the many benefits for construction teams, building owners, and facility managers. We profile some early successful applications.
| Dec 28, 2014
AIA course: Enhancing interior comfort while improving overall building efficacy
Providing more comfortable conditions to building occupants has become a top priority in today’s interior designs. This course is worth 1.0 AIA LU/HSW.
| Dec 28, 2014
6 trends steering today's college residence halls
University students want more in a residence hall than just a place to sleep. They want a space that reflects their style of living and learning.
| Dec 28, 2014
Using energy modeling to increase project value [AIA course]
This course, worth 1.0 AIA LU/HSW, explores how to increase project value through energy modeling, as well as how to conduct quick payback and net present value studies to identify which energy strategies are most viable for the project.
| Dec 28, 2014
The lowdown on LODs: Bringing clarity to BIM
These days, BIM is par for the course across most facets of design. But a lot of the conversation surrounding BIM still lacks clarity due to ambiguous terminology, a lack of clear-cut guiding illustrations, and widely varying implementation, writes GS&P's John Scannell.
| Dec 28, 2014
The future of airport terminal design: destination status, five-star amenities, stress-free travel
Taking a cue from the hospitality industry, airport executives are seeking to make their facilities feel more like destinations, writes HOK's Richard Gammon.
| Dec 28, 2014
10 key design interventions for a healthier, happier, and more productive workplace
Numerous studies and mountains of evidence confirm what common sense has long suggested: healthy, happier workers are more productive, more likely to collaborate with colleagues, and more likely to innovate in ways that benefit the bottom line, writes Gensler's Kirsten Ritchie.