16 Inch Dense Pack Cellulose Roof

Flat roof being dense packed the roof is opened up and cellulose is being blown into the roof cavity dense packing it.

16 inch dense pack cellulose roof.

Flat roof there are a gazillion of these roofs that are uninsulated and need to be addressed. What is the r value of nu wool premium cellulose insulation. Consumer protection safety commission 16 cfr parts 1209 and 1404. I am thinking about this and my assembly would look like.

Because the space between the inner and outer walls creates a thermal break that reduces heat loss through the framing members the actual r value will. The insulation installer is recommending opening the soffits and ridge. The house is a cape with a shed dormer roof with front pitch 6 12 and shed pitch 2 1 2 12. This is a technique that dense packs 3 7 lb of cellulose per cubic feet into existing wall and roof cavities.

Greenfiber the fiberized cellulose introduced in 1990 has about the same r value per inch. Fiberglass batts and cellulose used in walls earn similar conductive ratings between r 3 and r 4 per inch depending on density. And while the low density fiberglass insulation used in attics rates a much lower r 2 0 per inch there is typically very little space restriction in attics. There are continuous soffit vents.

When you dense pack an unvented roof here are factors to control for quality and performance. Section r 302 10 of the 2012 irc requires cellulose insulation to pass the following tests. Do not install cellulose below active roof leaks. The guy in the middle is jim fitzerald the absolute best guy in the world and he could not make it.

Pull out any existing fiberglass or make sure that you can dense pack the cellulose to the outside. However according to bohdan boyko a technical rep from u s. A properly applied dense packing of cellulose provides excellent r value to the home at 3 5 and 4 0 per inch dense packing cellulose helps stop air flow and improves home comfort. According to one source loose fill cellulose has an r value of r 3 8 per inch while dense packed cellulose at 3 5 pounds per cubic foot has a slightly lower r value of r 3 65 per inch.

For instance a 2 1 2 inch gap between the inner and outer frames creates a total 10 inch cavity that when filled with dense pack cellulose achieves a nominal insulating value of around r 31. What requirements are there for thermal insulation. Address wet basements or crawlspaces before insulating your roof.