In addition to climate r value also depends on the age of your home.
Attic insulation r value seattle.
If your insulation is lower than the joists in your roof then you need more insulation.
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Try to achieve an overall r 38 to r 49 rating with additional insulation.
The power of cleanliness often neglected the attic and crawl spaces play a crucial role in maintaining a safe and energy efficient home.
The easiest way to determine if you need more insulation in your attic is to poke your head in and take a look.
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.
Know exactly how much you need with our project calculators.
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.
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.
Intermediate framing denotes standard framing 16 inches on center with headers insulated with a minimum of r 10 insulation.
K for single rafter or joist vaulted ceilings the insulation may be reduced to r 38.
Vapor retarders shall not be required in roof ceiling assemblies where the ventilation space above the insulation averages 12 inches or greater.
Climate zone 2 r 25 minimum rigid board or air impermeable insulation r value.
Seattle crawl space and attic services.
The suggested r value for attic insulation is r38 or about 10 14 inches of insulation.
I the second r value applies when more than half the insulation is on the interior of the mass wall.
The higher the r value the greater the insulating effectiveness.
Batts are approximately r 3 to r 3 8 per inch of thickness.
The higher the r value the greater the insulation performance.
For homes in the seattle washington area we ve already established that the correct insulation r value climate zone is 4.
Does my attic need to be ventilated.
