Code Proposals Related to Daylight Zones, Skylights and Replacement Fenestration Approved

On the International Residential Code (IRC), a proposal by Jeff Inks representing the Window and Door Manufacturers Association (WDMA), to add section R308.6.9.1 to Chapter 44 of the code also was approved.

The section, titled “comparative analysis for glass-glazed unit skylights” describes structural wind load design pressure requirements and cites WDMA I.S. 11.

“Comparative analysis based on accepted engineering methods provides a proven, accurate and reliable means for determining design pressures of different sized products within a fenestration product line based on testing of specimen unit/s from the respective line,” wrote Inks in his proposal. “This alleviates the need for costly testing of all sizes within the line saving considerable construction costs and providing greater design flexibility without incurring additional time and costs, especially for specialty/custom products, for testing that isn’t necessary in order to determine the correct [design pressure].

He continued, “Currently the IRC only allows comparative analysis for windows and doors in Section 612.3.1 which has been and continues to be widely utilized for those products for the reasons stated above. Since comparative analysis as noted above is equally applicable to glass-glazed unit skylights, it should also be permitted by the IRC for them.”

The code hearings continue through tomorrow. Stay tuned to for the latest.

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