Cathedral Ceiling Insulation R Value

Did they tell you what effective r value they might achieve. I failed the insulation inspection because the inspector claims that i need a minimum of r 30 in cathedral ceiling. Energy efcient cathedral ceilings despite their popularity vaulted or cathedral ceilings are more dif ficult to insulate to today.

Compare insulation r values before you buy.

Cathedral ceiling insulation r value. It might work well if the slopes are dense packed and you. In the examples of a bonus room where a portion of the ceiling is cathedral or a tray ceiling incorporates rafters to form portions of the tray i am allowing a furr out of a 2x6 rafter with a 2x4 to achieve the 85 cavity. Cathedral ceiling insulation when building a cathedral ceiling as a room renovation project or as the ceiling for an entire new home or cottage it makes sense to start with the best solution possible if starting from scratch. I have r 19 for 2x6.

The r 21 high performance batt offers the high est r value in a 5 12 wall cavity. Frank in some situations we do cathedral ceilings with no venting. Also your fuel savings from insulation will depend upon the climate the type and size of your house the amount of insulation already in your house and your fuel use patterns and family. I am in the habit of requiring a minimum 85 insulation cavity for portions of rafter cavities formed where the rafter acts as the ceiling joist cathedral ceilings.

There are other factors to consider. This reduces its value to r 18. How am i supposed to get r 30 in 2x6 existing structure if that is the case. In order for this to work though you need enough insulation to keep the roof from getting warm from the heated room below.

Its called a hot roof. I am remodeling a house that has an existing cathedral ceiling with 2x6 rafters. I thought r 30 was only for new construction not remodel. All am i doing is adding insulation and drywall.

The amount of insulation you need depends mainly on the climate you live in. When standard r 19 insulation is used to ll 5 12 cavities it must be compressed to t.

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