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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.
Ceiling r value recommendation. These recommended levels have been determined to be cost effective for most homes. The table below shows u s. The amount of insulation recommended for your home will vary depending on a number of factors.
R 3 windows r 5 under slabs and for any below grade foundation walls r 10 for above grade foundation walls and slab perimeter full foundations are rare in these climates r 20 for above ground walls and r 60 for attics. Foam insulation r values range from r 4 to r 6 5 per inch of thickness 2 54 cm which is up to 2 times greater than most other insulating materials of the same thickness. Existing 3 4 inches of insulation.
Foam in place insulation can be injected into walls to reduce air leakage and improve r value. Exterior walls if your exterior walls are constructed from 2 by 4 inch studs the most insulation that can go into the wall while retaining its r value is r 13 or r 15 as these are both made to fit a cavity 3 1 2 inches deep. Add insulation to attic.
Where you live different climates require different insulation r values. Recommended insulation levels for retrofitting existing wood framed buildings. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3.
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. Department of energy recommendations for attic ceiling r values based on climate. Which areas of my home should i insu late to be eligible for the tax credit.
These levels should meet the criteria for the federal tax credit. Insulate the garage s ceiling by using the recommended r value for your area as advised by the department of energy s oak ridge laboratory. See the map for state by state r value recommendations.
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