R Factor For Live In Attic
2x4 walls can hold r 13 or r 15 batts.
R factor for live in attic. Add insulation to attic. Therefore at least 11 inches of fiberglass or 9 inches of. Existing 3 4 inches of insulation. 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.
The amount of insulation recommended for your home is dependent on where you live but here are some general guidelines. Warmer climates only require an r 38 or higher or about 12 or more. Recommended insulation levels for retrofitting existing wood framed buildings. 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.
Loose fill insulation usually made of fiberglass rock wool or cellulose comes in shreds granules or nodules. 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. They are available in widths suited to standard spacings of wall studs and attic or floor joists. 2x6 walls can have r 19 or r 21 products.