Compressed Insulation Attic

Then use the numbers in the chart at right to estimate its r value.

Compressed insulation attic.

Pull up and dispose of any material that s compressed water stained or moldy it s useless. I have a question for you regarding what you wrote. Insulation loses its effectiveness when it is constantly being compressed by being walked on or having boxes stored on it loses its insulation ability. What is attic insulation.

This lowers the insulation s r value. There are two main types of insulation. Batt and roll insulation and loose fill sometimes known as blown in insulation. When compressed to less than its labeled thickness glass fi ber insulation will experience a reduction in r value.

Let s look at an r 19 batt in a 2x6 cavity step 1. Loose fill blown in insulation is best for tight spaces or if your attic already has a layer of insulation. These thermal defects undermine the r value of your attic insulation. R value simply means resistance to heat flow.

Over the years fiberglass batt insulation gradually collapses and deteriorates. Simple thermal analysis reveals that if you have 5 missing insulation in an attic bare sheetrock you ll have a slightly more than a 54 drop in r value. To make a niche i want to compress the insulation quite a bit down to only 1 5 or 1 75 inches. I believe it is r 19.

Loose fill insulation must be applied using an insulation blowing machine in either open blow applications such as attic spaces or closed cavity applications such as those found inside existing walls or covered attic floors. Most manufacturers use 40 to 60 recycled glass content. Subtract the cavity depth from the thickness of the batt in inches. Yes the compressed r value can be estimated using the following method.

You can compress fiberglass insulation as much as you want i am trying to make a shower niche on a 2x6 exterior wall in which fiberglass insulation already exists. For every x the insulation material is compressed the r value decreases by approximately one half of that percentage or x compressed. Grab a tape measure and a flashlight to see what kind of insulation you already have in the attic and how deep it is. The chart below indicates the compressed r value of standard building insulation products when installed in framing cavities with a depth that is less than the labeled thickness of the insulation.

Learn more about where to insulate. See install batt and roll insulation for details.