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Walls, ceilings or floors common to separate conditioned tenancies shall be insulated to a minimum R-11, space permitting.
Exception: Mass common walls shall be insulated to a minimum of R-6.

Related Code Sections

1207.1 Interior Environment, Scope
This section shall apply to common interior walls, partitions and floor/ceiling assemblies between adjacent dwelling units or between dwelling units ...
1207.1 Interior Environment, Scope
This section shall apply to common interior walls, partitions and floor/ceiling assemblies between adjacent dwelling units and sleeping units ...