Blown In Insulation Over Batts

Batt or rolled insulation or blown loose fill insulation fiberglass or cellulose can be installed on top of old insulation. The r value can be reduced if the insulation is squashed or flattened. Blown in varieties however typically reach a peak of around a 2 8 r factor.

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Loosely blown fiberglass alone carries an r value of about 22 to 27 per square foot.

Blown in insulation over batts.

There are three types of blown in insulation. Find out how to install unfaced insulation correctly over blown in insulation. Blown in insulation thickness can vary in an attic space. The insulation usually is blended and provides an r value ranging from around 32 to 38 per square foot.

This will lead to non uniform r values. The r factor of blown in fiberglass is usually 2 3 to 2 8 per inch of material. The maximum rating of batt insulation is around 4 2. Learn how one caller made an installation mistake and increased his chances of mold and condensation when he tried to add unfaced insulation over his blown in attic insulation.

For eco minded homeowners cellulose is often the insulation of choice because it s made from finely. Disadvantages of batt insulation. Insulation should be rolled out perpendicular to the joists and unfaced rolls should be used. The depth and thickness of the blown insulation affect the r value.

Blown in insulation often is a combination of loose fiberglass and treated cellulose fibers. This light as air insulation is manufactured from glass that is heated to a liquid and then spun. Once installed and expanded to the uniform manufactured thickness batts offer a known r factor. Rolled insulation should not be tacked down.

Compared to blown in insulation batts can reach a resistance rating r factor of over 3 1.

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