Building Code Questions
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Minisplit code requirements
Minisplits installs are rarely inspected and there seem to be many variations on how people do things. im trying to find some definitive answers to some code related questions. 1. Condensate…
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2024 IRC Diffusion port area for unvented attic using air permeable insulation, 1:600 or 1:150?
The 2021 IRC states diffusion port area requirement as 1:600 (i.e. 1 square foot of diffusion port for every 600 square feet of ceiling) in subsection 5.2.2:https://codes.iccsafe.org/s/IRC2021P2/part-iii-building-planning-and-construction/IRC2021P2-Pt03-Ch08-SecR806.5Did the 2024 IRC…
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Screw piles instead of concrete foundation for two story addition
Hello we’re building a two story addition to our home and have decided to use helical piles instead of concrete slab on grade foundation. Each unit is around 950sq. Now…
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Sub Slab Vapor Retarder: Is two layers of 6 mil poly acceptable alternate to one layer of 10 mil poly?
The 2021 IRC requires sub slab vapor retarder to be 10 mil poly. I am told by masons this is very expensive product, and does not come in convenient sizes, …
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Roof venting and soffits in fire-rated roof overhangs
Hi, I'm working on a 2-story, small single family residential design (climate zone 5) as a builder-owner, and we're considering whether to pursue a 1h fire rated roof overhang to…
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Capillary Break at Footer
Hi,Hope somebody can help me out. I would like to use ice and water shield as a capillary break between the footer and the CMUs. I am in the western…
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Venting roof with open cover patio
New addition on my house - how do I vent the new roof directly behind the open covered patio? Do I need to drill holes in the rafter that touches…
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Using Roof EPS as Backfill for Above Ground Pool
Hi,I am planning to insulate & back fill a meteor crater like cavity along with a rectangular cavity on my back yard with EPS foam to be used as a…
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Electrical run in strapped cavity vs attic cavity
I have 2 questions: 1. I don't understand how strapping works for the electrical wires that go the opposite way of the strapping. It looks like in the photo the…
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Insulating fireplace foundation walls in a basement
I will be insulating the concrete foundation walls of a home with a 3" thickness of polyiso with an approved covering, 3/4" plywood specifically. There are two fireplaces in the…