Blown In Insulation Over Batts

This will lead to non uniform r values. Loosely blown fiberglass alone carries an r value of about 22 to 27 per square foot. Once installed and expanded to the uniform manufactured thickness batts offer a known r factor.

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For eco minded homeowners cellulose is often the insulation of choice because it s made from finely.

Blown in insulation over batts.

The r factor of blown in fiberglass is usually 2 3 to 2 8 per inch of material. This light as air insulation is manufactured from glass that is heated to a liquid and then spun. There are three types of blown in insulation. Batt or rolled insulation or blown loose fill insulation fiberglass or cellulose can be installed on top of old insulation.

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. Disadvantages of batt insulation. Blown in insulation thickness can vary in an attic space.

Find out how to install unfaced insulation correctly over blown in insulation. 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. Insulation should be rolled out perpendicular to the joists and unfaced rolls should be used.

Blown in varieties however typically reach a peak of around a 2 8 r factor. The insulation usually is blended and provides an r value ranging from around 32 to 38 per square foot. The r value can be reduced if the insulation is squashed or flattened. 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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