This Side Up: Installing Insulation Correctly – On the House

This Side Up: Installing Insulation Correctly

By on March 25, 2014

Picking the right face is essential with fiberglass insulation that has a vapor barrier (meaning with Kraft paper or foil attached on one side).

It should always face the warm-in-winter side. Thus, in cold climates, it should face the interior; in hot humid climates, it should face the exterior.

If a vapor barrier is installed on the wrong side, it can trap moisture inside wall cavities causing condensation to accumulate. This results in a musty smell, and eventually will cause wood to rot; it could even promote a serious mold problem.

Got insulation installed wrong side up? If so, remove it immediately, and inspect the subsurface for moisture or mold before reinstalling or replacing.

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