Today’s DIY Question

Faced or un-faced fiberglass Insulation?

by | DIY Questions

John asked


Which type of insulation is used in walls? Faced or unfaced?

DIY Answer Guy


Hi John,

Un-faced insulation is usually used in interior walls for sound reduction, in floor joist, over a crawl space and in-between the attic joist. Whereas faced insulation is used on exterior walls. The faced side of the insulation faces the inside of the building and acts as a moisture barrier, in conjunction with a sealed plastic vapor barrier.

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