780 CMR, ch. 34, pt. 1, 307, [BS] 805.2
Revise section as follows.
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 gravity load required by the International Building Code for new structures.
Exceptions: Retain exception number 1 revise number 2 and add number 3 as follows.
Buildings in which the increased dead load is attributable to the addition of a second layer of roof covering weighing 3 pounds per square foot (0.1437 kN/m2) or less. Insulation shall not be added such that it increases the thermal factor Ct in accordance with ASCE 7-16 Table 7.3-2 without checking capacity of existing structure.
Structural elements whose demand capacity ratio is not increased by more than 5%.
Revise section as follows.
780 CMR, ch. 34, pt. 1, 307, [BS] 805.2