Recommended insulation levels for retrofitting existing wood framed buildings.
R factor for live in attic.
The amount of insulation recommended for your home is dependent on where you live but here are some general guidelines.
Loose fill insulation usually made of fiberglass rock wool or cellulose comes in shreds granules or nodules.
Warmer climates only require an r 38 or higher or about 12 or more.
Existing 3 4 inches of insulation.
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.
Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.
Therefore at least 11 inches of fiberglass or 9 inches of.
Add insulation to attic.
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.
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.
2x6 walls can have r 19 or r 21 products.