Vaulted Ceiling Insulation Code

R 38 shall be deemed to satisfy the requirement for r 49 wherever the full height of uncompressed r 38 insulation extends over the wall top plate at the eaves.

Vaulted ceiling insulation code.

Bernice from midland ontario wants to know how to get more insulation into her vaulted or cathedral ceiling the common problem with structures like this that we call compact roofs is that there is not usually enough space for a lot of insulation and a lot of ventilation. Section r806 1 spray foam. Section r806 5 vented cathedral ceiling code local codes based on irc 2009. In fact when the only space you have is that left by a 2x8 or even a 2x10 you really can t do a perfect job of both.

The 2015 irc requires r 49 insulation for ceilings with attic spaces. Building codes require a minimum amount of insulation in ceilings and exterior walls to help a house maintain consistent temperature. So some people go to crazy lengths trying to reach r 40 or r 50 in their cathedral ceiling while their money would have been better spent on better air sealing better windows more efficient heating system or increased wall. When designing and building a cathedral ceiling using spray foam insulation you need to take into account code related to.

Pa302 1 ceilings with attic spaces n1102 2 1 r402 2 1. Section r806 4 local codes based on irc 2012. Retrofit or add on cathedral ceiling insulation questions answers set 2. However there is an exception.

How to install fiberglass insulation in vaulted ceilings. But codes rarely make the distinction between attics and cathedral ceilings in the minimum insulation requirements.