Tag Archives: metal construction

MCA Releases New White Paper Series on Metal Roofing and PV Solar Systems

White papers are part of MCA’s Metal University Online Learning

Last month, the Metal Construction Association (MCA) released a three-part white paper series on Metal Roofing & PV Solar Systems Parts 1, 2 & 3. Part one had been published earlier this year; parts two and three were recently added to expand on the original paper and supply additional technical guidance for optimal installation and mounting of photovoltaic (PV) solar systems on metal roofing.

“For residential and commercial rooftop electric power, PV systems are environmentally friendly and a sound economic investment,” says Andy Williams, MCA’s director of codes and standards. “These white papers go beyond the advantages of these systems and look at the durability of the roof, along with mounting and installation practices that provide the optimal foundation for these advanced systems.”

Part one details the benefits of metal roofing as a solar mounting platform. Included are important but frequently overlooked topics, such as service life and durability comparisons for metal roofing and PV systems. For instance, solar PV has a service life of more than 30 years. Metal is one of the only roofing materials that outlives the PV system.

Part two discusses how to mount solar PV to metal rooftops to provide the most benefit for building owners and solar contractors. This information is integral to lower installation costs and lengthen the product life cycle for the greatest return on investment. Topics include preserving the integrity of the roof and PV system, and code compliance.

Part three calls attention to the mounting system that marries the expensive PV array to the host roof and how metal roofs enable solar PV systems to perform at their best. The roles of careful planning, high-quality materials, design, and installation are highlighted.

The white papers are part of MCA Metal University and can be downloaded here: https://www.metalconstruction.org/index.php/online-education/metal-roofing–pv-systems-1-2-3

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Athena Institute changes service life of metal roofing to 60 years!

A recent MCA study of the service life of unpainted 55%Al-Zn low slope standing seam roofing has had an impact on the Athena Sustainable Materials Institute.  The report served as the technical substantiation for Athena to change the useful service life of this type of roofing product to 60 years!  Athena’s software allows for whole building LCA assessment, taking into account all materials, systems, assemblies and components used in a given type of building.

WHAT’S HOT FROM THE SUMMER MEETING: International Zinc Association Advocacy Effort

MCA is part of a Zinc Coalition that was formed by IZA in the aftermath of the Washington Department of Ecology rainwater runoff project that was concluded in 2014. Misuse of the information related to zinc from the runoff report is influencing the Governor’s office and the legislative bodies.

Letter-writing advocacy, with guidance from IZA, is showing positive impacts. Several meetings have been scheduled with IZA and Coalition members to discuss the shortcomings in the runoff report and the outdated clean water regulations. MCA members that have facilities in Washington were asked to get involved in the effort. Similar issues are being seen in California, the Great Lakes region and in Canada.

WHAT’S HOT FROM THE SUMMER MEETING: Edge Metal Test Standard

The investigation of roof damage from high-wind events has shown that failure often initiates at the corners and/or edges of metal roofing. To address this situation, MCA has embarked on developing a test method standard that could be used to test the pullout strength of variations to edge perimeter details. A task group has developed a draft of the test method, which has been reviewed by several testing laboratories.

The next steps will be to test edge metal at different laboratories to determine if the test method is sound and repeatable among the laboratories. After testing and validation has been completed, the task group will create an industry guide and bring it to market. MCA will then pursue the ANSI standard process to create an industry standard. This is similar to the track that SPRI took for the development of their ANSI/SPRI ES-1 Standard.

WHAT’S HOT FROM THE SUMMER MEETING: Cool Wall Research

Lawrence Berkeley National Laboratory was awarded a grant to conduct a research project on cool walls. This is important for California cities to find ways to reduce building energy usage and to help with the urban heat island effect.  California already has a project investigating the impact of cool pavement.  This wall project will evaluate the types of wall materials that are now in the marketplace. The performance of those products will be analyzed using outdoor exposure in three climates in California.  In addition, the dirt-shedding capability and durability of these wall systems will be evaluated. New technologies for ultra-cool pigmentation are also part of the research, in the field of product development.  The project begins in July with the product characterization on exposure racks.  The entire project will take 3 years to complete.  Several MCA member manufacturers are providing samples of their metal wall systems in this R&D program.  MCA is also participating in the project in their seat at the Industry Advisory Committee.

WHAT’S HOT FROM THE SUMMER MEETING: Spray Foam on Metal Panels

The use of spray polyurethane foam insulation on single skin metal panels is being studied for wall and roof assemblies.  A research project to evaluate the detrimental effects on metal was proposed with the Spray Polyurethane Foam Alliance (SPFA) and with the Metal Building Manufacturers Association (MBMA).  Issues such as oil canning from the exothermic curing of the foam and related elevated temperatures is one such item to evaluate. Other concerns are centered around potential damage to paint films. As a collaboration among MCA, MBMA and SPFA, preliminary research has already been done to evaluate the exothermic curing on metal.  The next phase will include the use of full size wall and roof assemblies with foam sprayed in different ways.  Results of the project will be used to generate a “Do’s and Don’ts” guideline for using spray foam insulation with metal wall and roof assemblies.

WHAT’S HOT THIS SUMMER: National Fire Protection Association 285

As with all test standards, NFPA 285 is reviewed on a regular basis to address inconsistencies and technical issues within the standard.  In March, an NFPA committee met and proposed changes to the wall construction for this test that will render many past tests invalid.  The proposed modification specifically locates panel joints where they were previously required to be “representative of standard construction practices”.  This modification will not only affect combustible exterior cladding, it will affect any wall assembly that contains combustible elements including insulation and barrier materials.  The NFPA proposed modifications are currently open for public comment until November.  During that time, MCA will work with NFPA to understand the reasoning behind this proposal and better define the level of impact.

NEW TECHNICAL BULLETIN JUST RELEASED!

Fastener Compatibility with Profiled Metal Roof and Wall Panels

Profiled metal roof or wall panels rely upon mechanical fasteners to secure the components to a structure. It is very important to select the correct type of fastener for metal construction in order to ensure a strong and weather-tight attachment. This Technical Bulletin serves as a guide for the selection of exposed fasteners used with metal roof and wall panels.

Download The Tech Bulletin > http://www.metalconstruction.org/download.php/education/user_file_2