The Fenestration and Glazing Industry Alliance (FGIA) updated a mulled assemblies document: AAMA 450-20, Performance Rating Method for Mulled Combination Assemblies, Composite Units, and Other Mulled Fenestration Systems.
The document was last updated in 2010. The performance rating method describes procedures and requirements for determining the air leakage, water resistance, and structural performance of mulled fenestration systems.
The document includes test procedures and calculation procedures for determining the performance of mulled fenestration systems. Mulled fenestration systems may be factory assembled or assembled onsite with parts and instructions supplied by the product manufacturer.
“The North American Fenestration Standard says that ‘mullion ratings shall be determined according to the requirements and procedures of AAMA 450 for both composite units and mulled combination assemblies.’ However, until now, AAMA 450 provided no guidance for composite units,” said Dave Goldsmith (PlyGem), co-chair of the FGIA Requirements for Mulled and Combination Window Assembly Update Task Group. “This document will put powerful new tools into the hands of engineers to assist them in determining how to construct structurally sound and weatherproof fenestration products in the most economical ways, and should also drastically reduce the amount of testing required to validate a large variety of composite unit configurations,” Goldsmith said.
Related Stories
Codes and Standards | Dec 19, 2018
Guidance for water utilities on indoor recycled water use released
Provides recommended ranges on 13 different parameters of water quality.
Codes and Standards | Dec 18, 2018
Development in Africa, Asia, and uptake in air conditioning will require more efficient buildings
Dramatic action will be needed for global building sector to cut carbon in line with international agreements.
Codes and Standards | Dec 14, 2018
Emissions for buildings and construction have peaked, UN says
Greener buildings have led to leveling off of GHGs.
Codes and Standards | Dec 13, 2018
Urban flooding causing economic loss, social disruption, and housing inequality
Extensive suburban development, aging and poorly maintained infrastructure, and more intense rainfall mean more flooding.
Codes and Standards | Dec 12, 2018
California’s transportation problems could prevent state from reaching carbon reduction goals
Governor’s carbon neutral-by-2045 ambitions at odds with car culture.
Codes and Standards | Dec 11, 2018
Strict seismic building codes credited with minimizing damage in Alaskan earthquake
Magnitude 7.0 temblor cracked roads and collapsed road ramps, but buildings held up well.
Codes and Standards | Dec 7, 2018
Florida tops ABC’s 2018 Merit Shop Scorecard rankings
Michigan rose fastest after passing prevailing wage law.
Codes and Standards | Dec 6, 2018
North American steel yields lower GHG emissions than Chinese steel
North American construction steel saves about half of GHG emissions on building project.
Codes and Standards | Dec 5, 2018
Canadian retailer builds net-zero stores
Other chains also boost green efforts with PVs, EV charging stations.
Codes and Standards | Dec 4, 2018
Action on building codes would spur low-carbon cities
Faster retrofit cycles, increased energy-efficiency requirements for existing buildings needed.
