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Under house crawl space

Should under the house be insulated?

Re: Under house crawl space

Well, yes.
Most State Codes require it now. Fiberglass in the joists is better than nothing.
If it's not a vented crawl space, insulating the walls with a rigid foam board or a 'curtain wall' (fiberglass insulation wrapped in a thick poly) are good options.
Spray foam is available, i'm just not a fan.

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