Climate zone 2 r 25 minimum rigid board or air impermeable insulation r value.
Attic insulation r value seattle.
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.
Seattle crawl space and attic services.
The higher the r value the greater the insulation performance.
Vapor retarders shall not be required in roof ceiling assemblies where the ventilation space above the insulation averages 12 inches or greater.
In addition to climate r value also depends on the age of your home.
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.
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.
I the second r value applies when more than half the insulation is on the interior of the mass wall.
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.
For homes in the seattle washington area we ve already established that the correct insulation r value climate zone is 4.
Know exactly how much you need with our project calculators.
Intermediate framing denotes standard framing 16 inches on center with headers insulated with a minimum of r 10 insulation.
Proper attic ventilation is important to keep your insulation and attic space dry and healthy.
Batts are approximately r 3 to r 3 8 per inch of thickness.
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.
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.
K for single rafter or joist vaulted ceilings the insulation may be reduced to r 38.
When determining how much insulation you need don t guesstimate calculate.
Loose fill cellulose is r 3 13 to 3 7 per inch and loose fill.
If your insulation is lower than the joists in your roof then you need more insulation.