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Recent Q&A
Insulating Walls Without Sheathing from Interior
I am renovating a 100-year old house near Seattle (climate zone 4 Marine). The house has wood siding nailed directly to 2x4 stud walls (no sheathing, no insulation, no tarpaper…
Flash-and-Batt Roof Insulation as Ignition Barrier
Do ordinary fiberglass batts in a flash-and-batt roof qualify as an ignition barrier? More specifically: Building a new house in WA state, outside Seattle. I have a limited-access unvented attic…
attic venting – oft-missed code requirement?
This question is regarding ventilated attics. Assume you’re calculating the required NFVA using the 1:300 ratio. Both IRC and IBC limit upper ventilation to 40–50% of the total required NFVA.…