16 Inch Dense Pack Cellulose Roof

The house is a cape with a shed dormer roof with front pitch 6 12 and shed pitch 2 1 2 12.

16 inch dense pack cellulose roof.

The 475 blog has a new post about unvented dense pack cellulose cathedral ceiling flat roof systems using intello membrane on the inside to allow the assembly to dry to the inside. What requirements are there for thermal insulation. Consumer protection safety commission 16 cfr parts 1209 and 1404. However according to bohdan boyko a technical rep from u s.

Do not install cellulose below active roof leaks. Flat roof being dense packed the roof is opened up and cellulose is being blown into the roof cavity dense packing it. Fiberglass batts and cellulose used in walls earn similar conductive ratings between r 3 and r 4 per inch depending on density. When you dense pack an unvented roof here are factors to control for quality and performance.

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. Pull out any existing fiberglass or make sure that you can dense pack the cellulose to the outside. Shingles roof felt ice guard osb taped seams dense pack cellulose intello drywall paint. Pull out the fiberglass and install r 20 dense pack cellulose by national fiber for the rafter bays at the cathedral and r 40 for the attic floor.

Section r 302 10 of the 2012 irc requires cellulose insulation to pass the following tests. 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. Greenfiber the fiberized cellulose introduced in 1990 has about the same r value per inch. What is the r value of nu wool premium cellulose insulation.

The insulation installer is recommending opening the soffits and ridge. This is a technique that dense packs 3 7 lb of cellulose per cubic feet into existing wall and roof cavities. 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. The guy in the middle is jim fitzerald the absolute best guy in the world and he could not make it.

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. I am thinking about this and my assembly would look like. There are continuous soffit vents.