Minimum R Value For Attic Insulation

You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

Minimum r value for attic insulation.

Your home s age if your home is more than 10 year old you likely need more insulation. Recycled glass or sand that s melted and spun into fibers. Most homes in the united states are not well insulated. Does your home have enough r value.

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 average recommended level is 17 inches of r60. Pa302 1 ceilings with attic spaces n1102 2 1 r402 2 1. Existing 3 4 inches of insulation.

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. Meet minimum r values given in table 402 1 1 frame walls r 13 block walls interior insulation r 7 8 exterior insulation r 6 ceilings. In zone 4 the average minimum requirement for attic insulation is 11 inches of r38 fill. In zone 3 the average minimum requirement for attic insulation is 9 inches of r30 fill.

Warmer climates only require an r 38 or higher or about 12 or more. R value measures how well certain building insulation materials can resist heat. R 38 shall be deemed to satisfy the requirement for r 49 wherever the full height of uncompressed r 38 insulation extends over the wall top plate at the eaves. The 2015 irc requires r 49 insulation for ceilings with attic spaces.

Maximum 20 of conditioned floor area. Add insulation to attic. Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation. The higher the r value the greater the insulation performance.

There are many ways to retrofit a home with fiberglass and. When determining how much insulation you need don t guesstimate calculate. Recommended insulation levels for retrofitting existing wood framed buildings. Raised r 13 sog r 0 windows.

Must be inside conditioned space. Where you live different climates require different insulation r values. Know exactly how much you need with our project calculators. However there is an exception.

However there is an exception.