R Value For Cathedral Ceiling Insulation

In most cases however insulation will not help prevent moisture.

R value for cathedral ceiling insulation. Existing 3 4 inches of insulation. Where the design of the roof ceiling assembly does not allow sufficient space for the required insulation such as cathedral ceilings the minimum required insulation for such roof ceiling assemblies shall be r 30. Cathedral ceilings should achieve an r value of 30 or 38 to meet the energy efficiency requirements of the international energy conservation code and many state codes in a large portion of the united states.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Foam board insulation would be a more economical especially if you are supplying the labor see photo. Rafter vent with built in baffle 10 ctn.

Add insulation to attic. For blown in or sprayed insulation the installer shall also provide the initial installed thickness the settl ed thi ckness the cover age area and the number of bags installed. Recommended insulation levels for retrofitting existing wood framed buildings.

Foil faced iso board can be cost effective insulation for finished attics and cathedral ceilings. Owens corning r 21 kraft faced fiberglass insulation batt 15 in. R 38 ecotouch pink cathedral ceiling kraft faced fiberglass insulation batt 23 3 4 in.

For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. Cathedral ceiling r value help if you re building in any kind of serious heating climate then an r 19 actually r 16 17 when framing is factored in with cold lines under the rafters is irresponsible. Pa302 2 ceilings without attic spaces n1102 2 2 r402 2 2.

Ado products durovent 23 1 2 in.