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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.
Attic insulation r value seattle. 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. Batts are approximately r 3 to r 3 8 per inch of thickness. The easiest way to determine if you need more insulation in your attic is to poke your head in and take a look.
The higher the r value the greater the insulating effectiveness. 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. 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.
Loose fill cellulose is r 3 13 to 3 7 per inch and loose fill. Know exactly how much you need with our project calculators. I the second r value applies when more than half the insulation is on the interior of the mass wall. If your insulation is lower than the joists in your roof then you need more insulation.
Seattle crawl space and attic services. When determining how much insulation you need don t guesstimate calculate. 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.
Proper attic ventilation is important to keep your insulation and attic space dry and healthy. Climate zone 2 r 25 minimum rigid board or air impermeable insulation r value. Does my attic need to be ventilated. Intermediate framing denotes standard framing 16 inches on center with headers insulated with a minimum of r 10 insulation.
Try to achieve an overall r 38 to r 49 rating with additional insulation. For homes in the seattle washington area we ve already established that the correct insulation r value climate zone is 4.
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