Does my attic need to be ventilated.
Attic insulation r value seattle.
Know exactly how much you need with our project calculators.
The easiest way to determine if you need more insulation in your attic is to poke your head in and take a look.
Climate zone 2 r 25 minimum rigid board or air impermeable insulation r value.
The power of cleanliness often neglected the attic and crawl spaces play a crucial role in maintaining a safe and energy efficient home.
When determining how much insulation you need don t guesstimate calculate.
For homes in the seattle washington area we ve already established that the correct insulation r value climate zone is 4.
K for single rafter or joist vaulted ceilings the insulation may be reduced to r 38.
R value measures how well certain building insulation materials can resist heat.
Proper attic ventilation is important to keep your insulation and attic space dry and healthy.
Seattle crawl space and attic services.
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.
In addition to climate r value also depends on the age of your home.
The higher the r value the greater the insulating effectiveness.
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The suggested r value for attic insulation is r38 or about 10 14 inches of 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.
Vapor retarders shall not be required in roof ceiling assemblies where the ventilation space above the insulation averages 12 inches or greater.
Loose fill cellulose is r 3 13 to 3 7 per inch and loose fill.
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.
The higher the r value the greater the insulation performance.
