Inspecting Basements and Crawlspaces

Many homeowners ask me all the time, “Do basements and crawlspaces need to be insulated?” No part of the house needs to be insulated. Insulating the basement and crawlspace will help to reduce heating costs and may improve comfort. Adding basement or crawlspace insulation is an improvement, rather than a repair, like any other insulation upgrade.
Where no basement wall insulation has been provided, we do not describe the house as having a defect. Basement wall insulation is an improvement, not a necessity.
If the crawlspace is not to be heated, insulation is usually provided on the underside of the floor. Insulation is typically tucked up between floor joists. The subfloor and flooring material above are usually relied on as the air/vapor barrier.

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