780 CMR, ch. 34, pt. 1, 307, [BS] 503.3

Current through Register 1538, January 3, 2025

Subsection [BS] 503.3 - Existing structural elements carrying gravity load

Any existing gravity load-carrying structural element for which an alteration causes an increase in design gravity load shall be replaced or altered as needed to carry the gravity loads required by the International Building Code for new structures. Any existing gravity load-carrying structural element whose gravity load-carrying capacity is decreased as part of the alteration shall be shown to have the capacity to resist the applicable design required by the International Building Code for new structures. The increase in gravity loads or decrease in capacity shall account for the cumulative effects of additions and or alterations since original construction.

Exceptions:

Add the words Insulation shall not be added such that it increases the thermal factor Ct in accordance with ASCE 7-16 Table 7.3-2 to the end of exception number 2 and add exception number 3.

3. Structural elements whose demand capacity ratio is not increased by more than 5%.

780 CMR, ch. 34, pt. 1, 307, [BS] 503.3

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