Section 202 - GENERAL DEFINITIONSCODE OFFICIAL.See 780 CMR 2.00, building official.
COMPLIANCE ALTERNATIVE. An alternative life-safety construction feature which meets or exceeds the requirements or intent of a specific provision of 780 CMR. The building official is authorized to approve or disapprove compliance alternatives. Compliance alternatives are allowed only for existing buildings.
REGISTERED DESIGN PROFESSIONAL IN RESPONSIBLE CHARGE. See 780 CMR 2.00, registered design professional
ROOF RECOVER. The process of installing an additional roof covering over a prepared existing roof covering.
301.1Applicability. Add the following sentence to end of section. Automatic sprinkler systems may be required by M.G.L. c. 148, §§ 26A, 26A1/2, 26G, 26G1/2, 26H, or 26I; or by M.G.L. c. 272, §§ 86 through 86D. See sections 101.4.5 and 903.2 of 780 CMR for additional guidance.
302.3Existing materials. Add the following section and table. 302.3.1 The values contained in Table 302 shall be used as material property values of the existing material listed therein, unless values are obtained from tests, specified by other provisions in this chapter, or values are used, based on available historical information for a particular type of masonry construction, prevailing codes and standards, and assessment of existing conditions. TABLE 302 MATERIALPROPERTY VALUES
Symbol/Notation | Description | MaximumValue | Notes |
f'm | See Section A104 | 300 psi | Per section A108.3 |
Em | Elastic Modulus in Compression | 550,000 psi | Based on f'm = 1,000 psi |
f'sp | See Section A104 | 0 psi | - |
vm | Masonry with running bond lay-up | 20 psi | - |
vm | Masonry, fully grouted, with a lay-up other than running bond | 20 psi | - |
vm | Masonry, partially grouted or ungrouted, with a lay-up other than running bond | 10 psi | - |
Add the following sections.
302.6Masonry Parapets. The following exception applies to requirements in 780 CMR 34.00 for masonry parapets: EXCEPTION: 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.
302.7 Structural Requirements Pertaining to Roofing Work.1. Structural requirements of parapets of unreinforced masonry required by sections 503.6 and 706.3.1 of 780 CMR 34.00 shall only apply when the intended alteration requires a permit for reroofing and when roof covering is removed from the entire roof diaphragm and not by the 25% roof area trigger found in these sections.2. Structural requirements of roof diaphragms resisting wind loads in high-wind regions required by sections 503.12 and 706.3.2 of 780 CMR 34.00 when the intended alteration requires a permit for reroofing shall only apply when roof covering is removed from the entire roof diaphragm and the building is located where the ultimate design wind speed is greater than 145 mph and the building is Risk Category IV in accordance with Table 1604.5 of 780 CMR. EXCEPTION: Buildings that have been demonstrated to comply with the wind load provisions in ASCE 7-88 or later editions.
302.8Structural Requirements Pertaining to Major Alterations.1. Structural requirements required by sections 503.8 and 906.5 of 780 CMR 34.00 for unreinforced masonry walls shall apply to buildings in seismic design category B in addition to categories C, D, E, and F found in these sections and shall require roof and floor levels to be anchored to the walls.2. Structural requirements required by sections 503.6 and 906.6 of 780 CMR 34.00 for unreinforced masonry parapets shall apply to buildings in seismic design category B in addition to categories C, D, E, and F found in these sections.3. Structural requirements required by sections 503.10 and 906.7 for unreinforced masonry partitions shall apply to buildings in seismic design category B in addition to categories C, D, E, and F found in these sections. [BS] 304.3.2Compliance with Reduced Seismic Forces. Add the following exceptions. EXCEPTIONS:
1. 780 CMR using 50% of prescribed forces when directed here by section 503.4 and 805.3, provided there is no substantial structural alteration.2. 780 CMR using either: a. 50% of prescribed forces when directed here by section 1103.3.1 and when the vertical addition increases the building area less than or equal to 30%; or,b. 75% of prescribed forces when directed here by section 1103.3.1 and when the vertical addition increases the building area more than 30% but less than 50%.780 CMR, § ch. 34, pt. 1, § 202
Amended by Mass Register Issue 1532, eff. 10/11/2024.