#Codewatcher twitter install#
Install whole-house mechanical ventilation that’s not exhaust-only.Increase airtightness from To do so, they’ve got an amendment up for adoption that would automatically allow R-20 impermeable insulation ( i.e., spray foam) if they meet three other stipulations:Ĭan Atmospheric Combustion Work in a Spray-Foam-Insulated Attic? Georgia’s R-20 spray foam amendmentįast-forward a couple of years, and now builders want to go back to the simpler days of getting R-20 spray foam−insulated rooflines to pass automatically.
In other words, they could get a lower insulation level for the attic to comply by using better-than-code windows, which builders were doing already anyway. They had been getting this lower level of attic insulation approved with a simpler method called the total UA alternative. Further, because the code also requires better windows, home builders can’t get homes to meet the code with R-20 spray foam insulation on the roof deck without demonstrating compliance through what’s called the performance path (section 405 in the IECC). The new state energy code requires R-38 attic insulation statewide. We did improve the attic insulation, though. Yes, we still allow R-13 2×4 walls in new homes. When we did, we increased the airtightness requirement, but not as much as the International Energy Conservation Code (IECC), and we opted out of better insulated walls.
It took us seven years to update the energy code. Unfortunately, Georgia has fallen behind. Now most states require blower-door tests and the threshold is generally in the 3 to 5 ACH50 range. Perhaps the biggest advance was that it required all new homes to meet a threshold for airtightness (7 ACH50). Ten years ago, Georgia led the United States in adopting a new energy code.
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