For attic walls, the recommended R-value varies based on climate zones. Each type has pros and cons. For example, fiberglass insulation is cost-effective but less airtight, while spray foam ...

Closed-cell polyurethane spray ... wall cavity filled with five inches of foam will achieve an impressive R-34, almost double ...

Yes, you can use blown-in insulation or injection foam for your wall joist space or spray foam insulation for ... is installing rigid foam boards on the interior surface of walls, which can ...