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IRC Section R606 — Interior Wall and Ceiling Finishes

Updated Apr 3, 2026

Establishes flame-spread requirements for interior finishes in residential buildings.

Section R606 of the IRC addresses interior finishes. Gypsum board is the standard wall and ceiling finish, with Class A flame-spread rating. Paint and wall coverings must have flame-spread Class A ratings in certain locations. Fabric wall coverings must meet flame-spread requirements. Foam plastics must have fire barriers protecting them unless they meet specific fire performance. Spray-applied insulation foam must be covered with gypsum board or other fire barrier material.

TAGS

irc interior-finishes drywall

DETAILS

section

R606

category

Interior Finishes

code body

IRC

code year

2021

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