Compressed Insulation Attic

Most manufacturers use 40 to 60 recycled glass content.

Compressed insulation attic.

This lowers the insulation s r value. When compressed to less than its labeled thickness glass fi ber insulation will experience a reduction in r value. Grab a tape measure and a flashlight to see what kind of insulation you already have in the attic and how deep it is. Then use the numbers in the chart at right to estimate its r value.

Loose fill blown in insulation is best for tight spaces or if your attic already has a layer of insulation. Insulation loses its effectiveness when it is constantly being compressed by being walked on or having boxes stored on it loses its insulation ability. I have a question for you regarding what you wrote. For every x the insulation material is compressed the r value decreases by approximately one half of that percentage or x compressed.

What is attic insulation. Yes the compressed r value can be estimated using the following method. Pull up and dispose of any material that s compressed water stained or moldy it s useless. When it s time to re roof adding 2 of roofing polyiso or a 2 5 polyiso nailbase panel would be sufficient to beat code minimum performance on a u factor basis due to the r11 thermal break over the rafters.

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. There are two main types of insulation. 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. Subtract the cavity depth from the thickness of the batt in inches.

These thermal defects undermine the r value of your attic insulation. See install batt and roll insulation for details. Over the years fiberglass batt insulation gradually collapses and deteriorates. Batt and roll insulation and loose fill sometimes known as blown in insulation.

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. R value simply means resistance to heat flow. The floor insulation can simply be left in place if you re now heating the attic. Learn more about where to insulate.

Let s look at an r 19 batt in a 2x6 cavity step 1. To make a niche i want to compress the insulation quite a bit down to only 1 5 or 1 75 inches.