Technical > Home Improvement > Crawl Space Insulation

Crawl Space Insulation

I would use fiberglass insulation between the floor joists. You could use the foamboard on the foundation walls.
If you have pipes or air ducts, just insulate the walls.

reply to Erietech
In 3 different jurisdictions, here in the PNW a vapor barrier laid on top of ground is required. Usually 6 mil black plastic.

Insulation batting was placed between the floor joists, 1 time on new construction and another on 2 renovations.

Something like this was used to keep it in place:
»www.homedepot.com/p/t/100375163/···00375163

Sorry after I re-read my post I see where the confusion is coming from, in our we have sloped roofs, so I'm referring to the crawl space being in the attic.
I've attached a picture:
»imgur.com/w6dA9dS

Ok another question our house does not have soffits, how far do I put the insulation near the overhang?
»imgur.com/GYRY5g5

In the soffit areas go below the existing insulation. Above the bedroom area would ideally be insulated as well. Be a difficult area to put batts in, perhaps blown in cellulose.

reply to Erietech

reply to Erietech

That's the way I read into it as well, no vents.

reply to VioletVenom

Reference Erietech's last illustration where he denotes "crawl space insulation". The two lines he drew for that insulation and rafter insulation bisect in a soffit area. I suggested taking his rafter insulation below the top of the crawl space insulation into the soffit area.

If he had soffit vents he would want to install insulation channels first before insulating. No vents so moot point, filling in any infiltration area with insulation is ideal.