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What Are the Different Types of Attic Wall Insulation?

Spray foam insulation on a house.
A roll of mineral wool insulation.
Spray foam insulation increases energy efficiency.
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  • Written By: Christina Edwards
  • Edited By: W. Everett
  • Last Modified Date: 29 August 2014
  • Copyright Protected:
    2003-2014
    Conjecture Corporation
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Blanket insulation is one of the most popular types of attic wall insulation. It comes in either very long rolls, or pre-cut strips. Rigid insulation comes in the form of large, stiff sheets, which can be cut to fit between joists or studs. Spray insulation, on the other hand, is a liquid insulation that is sprayed into the spaces in the wall, and it expands to fill the crevices before it dries. Loose insulation is also available, and this is usually forcefully blown into the spaces between walls.

Since it is typically one of the least expensive options, blanket insulation is often used as attic wall insulation. As its name suggests, this type of insulation is made from a blanket of flexible fibers. Fiberglass is the most common type of insulation used to make this type of insulation, but wool and other natural fibers may also be used. It also often has some type of backing, such as a paper backing.

Blanket insulation typically comes in a couple widths, which makes it easier to fit between the standard space between typical wall studs. Batt insulation is usually cut to specific standard lengths as well. Rolled insulation, on the other hand, comes in large rolls, and it must be measured and cut to fit in the spaces between wall studs.

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Rigid insulation is made of a variety of insulation materials, including fiberglass and foam, pressed into a rigid board. It can be easily cut with a knife, in order to fill gaps between wall studs. This type of insulation is often used either on exterior walls or unfinished interior walls. Some homeowners use rigid insulation as attic wall insulation in an unfinished attic. It can also be used in conjunction with other kinds of insulation for extra protection against the elements.

Spray foam insulation is a type of insulation that starts out as a type of liquid foam. After it is sprayed onto a wall, it rapidly expands to several times its original size. It then dries, forming a hard barrier filled with tiny air pockets. Spray foam insulation can be used as attic wall insulation, and small aerosol cans of this insulation can be purchased for small spaces. For large attics, however, hiring a professional is usually recommended.

Loose insulation can also be used as attic wall insulation, and it usually consists of small pellets of insulating material. This type of insulation is usually used to insulate walls that are already finished, but without existing insulation. Holes are drilled through the finished wall between the studs. The loose insulation is then usually blown into the spaces between the walls.

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