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.

Vaulted ceiling insulation code.

But codes rarely make the distinction between attics and cathedral ceilings in the minimum insulation requirements. Pa302 1 ceilings with attic spaces n1102 2 1 r402 2 1. 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. Unvented cathedral ceiling code local codes based on irc 2009.

The 2015 irc requires r 49 insulation for ceilings with attic spaces. Section r806 5 vented cathedral ceiling code local codes based on irc 2009. Retrofit or add on cathedral ceiling insulation questions answers set 2. Building codes require a minimum amount of insulation in ceilings and exterior walls to help a house maintain consistent temperature.

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. When designing and building a cathedral ceiling using spray foam insulation you need to take into account code related to. Section r806 4 local codes based on irc 2012. However there is an exception.

This article series gives suggestions for insulating cathedral ceilings on older homes providing under roof ventilation for cathedral ceilings while obtaining higher insulation values or r values for these areas. How to install fiberglass insulation in vaulted ceilings.