Cellulose Or Fiberglass Blown In Insulation Attic

You can get to the same place with either material.

Cellulose or fiberglass blown in insulation attic.

Blown fiberglass on the other hand is made up of very fine strands of glass and these tiny fibers are a carcinogen that can easily be inhaled into your lungs. Loose fill or blown cellulose insulation is manufactured primarily from recycled newspapers a very benign product so it poses virtually no ongoing health risk. Blown in insulation may be used in attics with ample room for an installer. The situation was made much worse by the attic s blown in cellulose insulation.

Typically attics with a pitch of 3 12 or greater will provide enough room for an installer to crawl through the trusses. Installation costs for blown in insulation costs around 2 a square foot where installation costs for batts is around 1 a square foot. Once the material becomes wet it s very difficult to clean up. Making cellulose a better choice for homes in northern climates.

It can be used by itself to fill in joist cavities that have no insulation or laid as a thick layer over the top of existing batts of fiberglass insulation. The installation process for dry cellulose insulation looks like this. Attic blown cellulose is typically the preferred choice of insulation for attics. Blown in cellulose and fiberglass are excellent products for new construction.

At 3 5 per inch of material the r value of blown in cellulose is 23 better per inch than fiberglass batts. Rather than trying to meticulously lay fiberglass insulation over the attic homeowners and builders can simply blow cellulose insulation throughout the attic. Fiberglass batts however are less expensive costing on average 0 30 to 0 40 a square foot for 6 inches of insulation. Assuming your current attic insulation is made from fiberglass and has a value of r 13 you d have to add roughly 10 inches of additional fiberglass to hit r 38.

When comparing blown in insulation both fiberglass and cellulose are nearly identical in price both costing around 0 70 to 0 80 per square foot for 6 inches of insulation. Or 7 inches of cellulose. This is the most common type of blown in. Advantages and disadvantages of fiberglass.

However that service does add to the cost of restoration. According to research done at the oak ridge national lab fiberglass loses up to 50 of its r value in very cold conditions. Often fiberglass batts are used in areas with limited access. In this case we worked with the insurance company and took care of packing out belongings in the attic.

Dry blown cellulose will characteristically settle and sag in place reducing its r value. Wet blown cellulose is also subject to similar contamination too.