Code Change Proposal Tightens Window Efficiency; Allows Flexibility
if Combined with Other Efficient Features
October 27, 2009
The International Code Council's Code Development Hearings are
currently underway in Baltimore. A number of code change proposals
for the International Residential Code (IRC), building/energy, were
presented before the IRC committee earlier today.
The National Association of Home Builders EC16 (part 2) was one
proposal that was approved. This will reformat the prescriptive
table to include various alternative prescriptive "packages"
with different combination of envelope values, home air leakage,
duct leakage, and equipment efficiency. It tightens the efficiency
of window requirements across the board, but also provides flexibility
to use different window values if a homeowner has efficient HVAC
equipment, home air leakage, etc.
In addition, proposal EC36 was also approved. This will add a new
column with separate and higher solar heat gain coefficient requirements
for skylights, as they are different from [vertical] windows.
Proposal EC74 was also approved, which allows a trade-off for SHGC
in zones 1-3 based on the amount of shading provided by overhangs.
Some of the disapproved proposals included attempts to remove the
allowance footnote for hurricane products (EC35), and limitations
on overall glazing area to less than 20 percent (EC31).
Stay tuned to USGNN.com for more code hearing updates as they
are made available.
Need more info and analysis about the issues?
HERE to subscribe to USGlass magazine.