Seattle Attic Insulation R Value

Seattle crawl space and attic services.

Seattle attic insulation r value.

The manufacturer s settled r value shall be used for blown insulation. Insulation material used in layers such as framing cavity insulation or continuous insulation shall be summed to compute the corresponding component r value. 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. Insulation levels are measured by r value which indicates the resistance to heat flow of the insulation.

Batts are approximately r 3 to r 3 8 per inch of thickness. Recommended insulation levels for retrofitting existing wood framed buildings. This can happen over time or by pests getting into your home and tearing it up. Seattle attic insulation installation if your home has been especially cold in the winter and your heater is constantly working to keep your house warm it s likely your insulation is worn down or damaged.

The easiest way to determine if you need more insulation in your attic is to poke your head in and take a look. Computed r values shall not include an r value for other building materials or air films. 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. 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. Know exactly how much you need with our project calculators. The suggested r value for attic insulation is r38 or about 10 14 inches of insulation. When determining how much insulation you need don t guesstimate calculate.

The higher the r value the greater the insulation performance. Add insulation to attic. 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.

In addition to climate r value also depends on the age of your home. The higher the r value the greater the insulating effectiveness. Existing 3 4 inches of insulation. 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.

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.