[Amy Chambers]

Also worth considering: locking in material orders when prices dip. We bought a 6-month supply last spring when prices were lower. Saved us considerably.

[Amy Chambers]

Washington state has adopted specific amendments to the IECC. Most of WA west of the Cascades is zone 4C or 4A. Worth a call to the building department before the job.

[Amy Chambers]

In practice a lot of attics have foam sprayed around existing wiring and nothing bad happens. But from a code standpoint foamologist_rex is right. Check with your inspector first if permits are involved.

[Amy Chambers]

Open cell is around R-3.7 per inch, closed cell runs R-6 to R-7 per inch. For a 2×6 wall (5.5 inches), open cell gives you around R-20, closed cell gets you R-33 if you fill it completely.

[Amy Chambers]

55F is borderline. Ideally substrate should be above 60F. Run a space heater in there for a few hours before you start. The tanks should also be 70-80F for proper mixing.

[Amy Chambers]

Froth-Pak is solid for DIY. For a crawl space that size get the 650 board foot kit, maybe two. Do not forget safety gear – respirator, safety glasses, and gloves are non-negotiable.

[Amy Chambers]

For an accessible attic you may want to check your local code. Some jurisdictions require a thermal barrier over exposed foam. It is a fire code requirement not just about color.

[Amy Chambers]

For an accessible attic you may want to check your local code. Some jurisdictions require a thermal barrier over exposed foam. It is a fire code requirement not just about color.

[Amy Chambers]

Very normal! Closed cell foam yellows and darkens over time when exposed to UV light and air. It is purely cosmetic and does not affect performance at all.

[Amy Chambers]

Very normal! Closed cell foam yellows and darkens over time when exposed to UV light and air. It is purely cosmetic and does not affect performance at all.

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