R Factor For Live In Attic

Therefore at least 11 inches of fiberglass or 9 inches of. In most climate zones of the country an attic r value of at least 35 is considered the minimum to meet today s energy conservation goals. Add insulation to attic.

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Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces.

R factor for live in attic.

Loose fill insulation usually made of fiberglass rock wool or cellulose comes in shreds granules or nodules. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. The amount of insulation recommended for your home is dependent on where you live but here are some general guidelines. Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.

Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation. 2x6 walls can have r 19 or r 21 products. They are available in widths suited to standard spacings of wall studs and attic or floor joists. 2x4 walls can hold r 13 or r 15 batts.

Existing 3 4 inches of insulation. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Warmer climates only require an r 38 or higher or about 12 or more. Recommended insulation levels for retrofitting existing wood framed buildings.

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