Attic Insulation R Value Seattle

If your insulation is lower than the joists in your roof then you need more insulation.

Attic insulation r value seattle.

Intermediate framing denotes standard framing 16 inches on center with headers insulated with a minimum of r 10 insulation. Loose fill cellulose is r 3 13 to 3 7 per inch and loose fill. The power of cleanliness often neglected the attic and crawl spaces play a crucial role in maintaining a safe and energy efficient home. K for single rafter or joist vaulted ceilings the insulation may be reduced to r 38.

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. When determining how much insulation you need don t guesstimate calculate. I the second r value applies when more than half the insulation is on the interior of the mass wall. In addition to climate r value also depends on the age of your home.

Vapor retarders shall not be required in roof ceiling assemblies where the ventilation space above the insulation averages 12 inches or greater. 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. Climate zone 2 r 25 minimum rigid board or air impermeable insulation r value. The higher the r value the greater the insulation performance.

Try to achieve an overall r 38 to r 49 rating with additional insulation. Batts are approximately r 3 to r 3 8 per inch of thickness. R value measures how well certain building insulation materials can resist heat. The suggested r value for attic insulation is r38 or about 10 14 inches of insulation.

Does my attic need to be ventilated. Know exactly how much you need with our project calculators. Seattle crawl space and attic services. For homes in the seattle washington area we ve already established that the correct insulation r value climate zone is 4.

If you look at the chart above you can see that the attic should achieve an r value between r 38 and r 60 depending on the current insulation levels. Proper attic ventilation is important to keep your insulation and attic space dry and healthy.