Minimum R Value Attic Insulation

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. Ceiling insulation must be much higher at r 30 and a raised floor must be at least r 13.

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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.

Minimum r value attic insulation.

2015 code requires walls to be insulated with a minimum of r 20 or r 13 5 13 5 means r 13 cavity insulation plus r 5 insulated sheathing. Recommended home insulation r values. The table below shows what levels of insulation are cost effective for different climates and. Insulation level are specified by r value.

Our r value cognitive dissonance. Your home s age if your home is more than 10 year old you likely need more insulation. In general to optimally isolate an attic on average an r value of the insulation is required ranging from r 50 to r 60. Performance compliance walls ceilings floors.

The higher the r value the greater the insulation performance. Prescriptive compliance form 405. How much insulation in attic for zones 1 4. The higher the r value the better the thermal performance of the insulation.

Know exactly how much you need with our project calculators. If we put ducts in unconditioned space. The average recommended level is 17 inches of r60. Maximum 20 of conditioned floor area.

For block walls interior insulation must meet or exceed r 7 8 and exterior insulation must be r 6. In zone 2 the average minimum requirement for attic insulation is 9 inches of r30 fill. R value is a measure of insulation s ability to resist heat traveling through it. R value measures how well certain building insulation materials can resist heat.

The insulation levels of an attic or of any part of a house are understood through the r value that is the value with which the insulating material is resistant to heat flow. Where you live different climates require different insulation r values. Raised r 13 sog r 0 windows. If structural sheathing covers 40 or less of the exterior continuous insulation r value shall be permitted to be reduced by no more than r 3 in the locations where structural sheathing is used.

The average recommended level is 14 inches of r49. What i m talking about is a house with ducts in unconditioned space especially an unconditioned attic. When determining how much insulation you need don t guesstimate calculate. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

I m in georgia iecc climate zone 3 where our current state code requires r 13 in exterior walls r 18 in attic kneewalls r 19 in floors and r 30 in ceilings. In zone 1 the average minimum requirement for attic insulation is 9 inches of r30 fill. Insulating power or r value is only one factor to consider when building or improving a home to keep it comfortable. There are many ways to retrofit a home with fiberglass and.

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