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The higher the r value the greater the insulation performance.
Attic insulation r value seattle. Know exactly how much you need with our project calculators. Try to achieve an overall r 38 to r 49 rating with additional insulation. In addition to climate r value also depends on the age of your home. I the second r value applies when more than half the insulation is on the interior of the mass wall.
The suggested r value for attic insulation is r38 or about 10 14 inches of insulation. Climate zone 2 r 25 minimum rigid board or air impermeable insulation r value. R value measures how well certain building insulation materials can resist heat. When determining how much insulation you need don t guesstimate calculate.
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. We are the number one service provider for attic and crawl space cleaning insulation installation and removal and animal proofing in the seattle and surrounding areas. 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.
Batts are approximately r 3 to r 3 8 per inch of thickness. For homes in the seattle washington area we ve already established that the correct insulation r value climate zone is 4. Intermediate framing denotes standard framing 16 inches on center with headers insulated with a minimum of r 10 insulation. The higher the r value the greater the insulating effectiveness.
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. Seattle crawl space and attic services. Does my attic need to be ventilated. The easiest way to determine if you need more insulation in your attic is to poke your head in and take a look.
If your insulation is lower than the joists in your roof then you need more insulation. K for single rafter or joist vaulted ceilings the insulation may be reduced to r 38.
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