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Re: Chimney flue firestopping
From the 2006 IRC. (underlining is mine)
- R602.8 Fireblocking required. Fireblocking shall be provided to cut off all concealed draft openings (both vertical and horizontal) and to form an effective fire barrier between stories, and between a top story and the roof space. Fireblocking shall be provided in wood-frame construction in the following locations.
- - 1. In concealed spaces of stud walls and partitions, including furred spaces and parallel rows of studs or staggered studs; as follows:
- - - 1.1. Vertically at the ceiling and floor levels.
- - - 1.2. Horizontally at intervals not exceeding 10 feet (3048 mm).
- - 2. At all interconnections between concealed vertical and horizontal spaces such as occur at soffits, drop ceilings and cove ceilings.
- - 3. In concealed spaces between stair stringers at the top and bottom of the run. Enclosed spaces under stairs shall comply with Section R311.2.2.
- - 4. At openings around vents, pipes, ducts, cables and wires at ceiling and floor level, with an approved material to resist the free passage of flame and products of combustion.
- - 5. For the fireblocking of chimneys and fireplaces, see Section R1003.19. (Jerry's note: see below.)
- - 6. Fireblocking of cornices of a two-family dwelling is required at the line of dwelling unit separation.
- SECTION R1003
- - MASONRY CHIMNEYS
- - - R1003.19 Chimney fireblocking.
- - - - (Section 1003 is not applicable as that is not a masonry chimney, thus 1003.19 is not applicable)
Fireblocking is to be at all ceiling and floor levels *and* every 10 feet horizontally (such as for parallel row or staggered stud walls).
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