It basically identifies 6 main spaces.
Irc attic bedrooms.
Attics that meet the size and ceiling height criteria of the habitable attic definition in chapter 2 are considered habitable.
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.
The international residential code irc which is updated every three years catalogues the requirements for a bedroom.
Please be aware of the definition and egress requirements of a habitable attic as it relates to dwellings built from the 2012 irc.
First off lets break down section r305 to make it easy to follow.
Pa302 1 ceilings with attic spaces n1102 2 1 r402 2 1.
However there is an exception.
The 2015 irc requires r 49 insulation for ceilings with attic spaces.
It covers such things as square footage ceiling height electrical outlets lighting and ventilation closets and emergency exits.
Lets look at the 2015 international residential code irc to see how these minimum height requirements apply.
Attic area exceeds 30 square feet and.
All things building related are codified and bedrooms are no exception.
The 2009 and 2015 irc verbiage is similar and still applicable.