Building Officials Association of Florida
Protecting Lives and Property since 1953

Interpretation #9574

Published August 14, 2026

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Original Request

Code Version
2023
Code
RESIDENT
Code Description
Chapter
3
Section
R302.11
Topic
Fireblocking Requirements – concealed attic space

Question

Does Section R302.11 of the Florida Building Code-Residential require fireblocking at the location where an attic space opens into a tub cavity or interstitial floor cavity, when that cavity is not accessible from the occupied side of the dwelling and therefore functions as a concealed space?

Answer Published 08/11/2026 at 4:01 PM

If the space qualifies as combustible construction, fireblocking must be provided which cuts off both vertical and horizontal draft openings that are concealed such that an effective fire barrier is created. This is true for areas between stories and between a top story and roof space.

Commentary

None.