Wood Frame Walls

Fiberglass insulation is available as blanket batts, rolls or as loose-fill and is the most ubiquitous insulation material
used in home construction, the Department of Energy reports. This type of insulation is easy to install and well suited
as a do-it-yourself project. Resistance to conductive heat flow provided by insulation is measured in terms of its thermal
resistance or R-value. The higher the R-value, the greater the insulating effectiveness. An R-value of R15 for wall
insulation would be appropriate for locations that experience cool summers and mild winters.

High Moisture

When a home is built on a steep incline, one or more of its walls may be built into the earth, providing direct contact
with moisture-causing elements. Moisture can be detrimental to insulation by promoting the growth of mold or mildew.
Closed-cell spray foam insulation will provide a moisture barrier and can be easily installed into walls with plumbing,
wiring or other utilities. Foam board insulation can offer many of the same benefits of spray foam at a lower cost.
Installation of spray foam insulation requires special equipment, while foam board is easily installed by hand.

Existing Walls

While insulation can be easily installed during new construction, insulating existing walls can be more difficult.
Spray foam or blown-in insulation may be the best option for installation into hollow spaces via a drilled hole or
existing opening. This option eliminates the need for wall demolition. Some spray foam products also offer a
fire-retardant feature in addition to thermal insulation features. Because installing spray foam or blown-in
insulation requires special equipment, installation is generally best suited to professionals.


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