An interior wall is any wall that does not face outside. You may think that such walls do not require insulation. However, interior wall insulation adds significantly to the enjoyment of peace, privacy and comfort in your home by keeping sound from migrating from one room to another. Interior wall insulation also contributes to your home's overall energy efficiency.

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Basement walls and walls in unvented crawl spaces should be insulated to help prevent substantial heat loss. (A crawl space is an unfinished, accessible area below the first floor of a building. An unvented crawl space is part of the basement while a vented crawl space opens to the outside.) Remember, an uninsulated basement alone can account for 25% or more of a home's total heat loss.

Unframed, exterior basement walls should be insulated with blanket insulation, which can be installed horizontally or vertically. Typically, the blanket is held against the sill plate at the top of the basement wall with furring strips. In addition to the furring strips, you will need patch tape, and depending on the installation method you choose, possibly a Hilti-type gun and special fasteners for driving into concrete or cinder blocks.

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Sloped, vaulted, and cathedral ceilings are different names for essentially the same ceiling configuration. These ceilings are very popular in newer homes and remodeled homes, and they certainly add dramatic visual interest to a room. But because there is little or no attic space separating inside and outside air, proper insulation is especially important.

Many cathedral ceilings will require that insulation be installed around recessed light fixtures. There are some important safety measures you should be aware of when working with insulation around light fixtures. Be sure to review the Special Considerations for the information you need to complete the installation without creating potential fire hazards.

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Knee walls are side walls that back up to an unconditioned space such as an attic or garage. These walls should be insulated in the same way as any exterior wall using Kraft-faced insulation or unfaced insulation with a separate vapor retarder.

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