Header:
CODE OF MARYLAND REGULATIONS
TITLE 05. DEPARTMENT OF HOUSING AND COMMUNITY DEVELOPMENT
SUBTITLE 16. MARYLAND BUILDING REHABILITATION CODE
CHAPTER 06. CHANGE OF USE AND OCCUPANCY--REPEALED
Date:
08/31/2009
Document:
.17 Structural Safety.
A. Live Loads.
(1) Requirements. An existing structure in which the proposed new occupancy requires floor live loads equal to or less than required for the existing occupancy is permitted to be continued in use for the originally approved live loads, if the structure is not dangerous and is adequate for the proposed occupancy. If the approved floor live load is less than required by § 1607 of the Building Code, the areas designed for the reduced live load shall be posted with the approved load or shall be structurally strengthened to support the new load. Placards shall be of an approved design.
(2) Exception. An exception to the requirement of § A(1) of this regulation is that methods specified in the code under which the building was constructed, the current Building Code, or other standards as approved by the authority having jurisdiction may be used for analysis and test methods for evaluation of existing materials.
B. Vertical Loads on Roofs.
(1) Requirement. Buildings and structures shall be in compliance with the roof load requirements of § 1607.11 of the Building Code for roof live load.
(2) Exception. An exception to the requirement of § B(1) of this regulation is that existing roofs may be retained, if any unsafe or overloaded conditions are corrected and when the roof dead load is not increased by use, reroofing, or added equipment.
C. Wind and Snow Loads. When a change of occupancy results in an existing building being assigned a higher wind load or snow load importance factor in accordance with Table 1604.5 of the Building Code, the building shall be strengthened to meet the wind load or snow load requirements of §§ 1609 and 1608, respectively, of the Building Code.
D. Earthquake Loads.
(1) Requirement. When a change of occupancy results in an existing building being reclassified to a higher hazard category as shown in Table D, the building shall be strengthened to meet the earthquake requirements of §§ 1613--1623 of the Building Code.
(2) Exceptions. The following is an exception to the requirement of § D(1) of this regulation: For buildings located in seismic map areas having an effective peak velocity-related acceleration (Av) value of less than 0.15 (applicable throughout the State), strengthening the building to meet the seismic requirements for new buildings is required only when the change of occupancy results in a building being reclassified to hazard category 1 (highest). All other buildings so located are not required to be strengthened.
E. Table D
Table D
SEISMIC HAZARD CATEGORIES
RELATIVE HAZARD OCCUPANCY--REPEALED CLASSIFICATION
1 H-1, H-4 and H-5 with highly toxic
(Highest Hazard) materials I-2 (hospitals) B (fire, rescue,
and police stations) B (emergency
preparedness centers) B (primary
communication facilities) S (post-
earthquake recovery vehicle garages) F
(power-generating stations and other
utility facilities required for emergency
backup)
2 A, E, I-1, I-2 (all others), I-3, H-2,
H-3, H-5 F (power-generating stations and
other public utilities not listed in
Relative Hazard 1) B (used for adult
education with an occupant load 500) Any
building with an occupant load 5000
3 I-4, R-1, R-2, R-4
4 F-1, S-1, H-4
5 B (all others), F-2, M (all others), S-2
6 (Lowest Hazard) R-3, U
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