780 CMR, ch. 34, pt. 1, 307, [BS] 906.6

Current through Register 1538, January 3, 2025

Subsection [BS] 906.6 - Bracing for unreinforced masonry parapets, chimneys and appendage

Parapets constructed of unreinforced masonry, unreinforced masonry chimneys and exterior wall appendages in buildings assigned to Seismic Design Category B, C, D, E or F shall be removed, have bracing installed, as needed to resist the reduced International Building Code-level seismic forces in accordance with Section 304.3, unless an evaluation demonstrates compliance of such items. Use of reduced seismic forces shall be permitted.

EXCEPTIONS:

1. If the height-to-thickness ratio of an unbraced unreinforced masonry parapet does not exceed 2.5, then bracing is not required. For the purpose of this exception the height shall be measured from either the level of tension anchors or the roof sheathing, whichever is lower.

2. Chimneys braced by or anchored to the roof structure and extending less than 4 feet above it.

780 CMR, ch. 34, pt. 1, 307, [BS] 906.6

Amended by Mass Register Issue 1532, eff. 10/11/2024.