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Unformatted text preview: ldings may be changed subject to the approval of the Building Official and the building may
be occupied for purposes set forth in other Groups: Provided the new purposed use is less hazardous,
based on life and fire risk, than the existing use.
SECTION 703. Mixed Occupancy
When a building is of mixed occupancy or used for more than one occupancy, the whole building
shall be subject to the most restrictive requirement pertaining to any of the type of occupancy found
therein except in the following:
(1) When a one-storey building houses more than one occupancy, each portion of the
building shall conform to the requirement of the particular occupancy housed therein and;
(2) Where minor accessory uses do not occupy more than ten percent of the area of any floor
or a building, nor more than ten percent of the basic area permitted in the occupancy requirements, in
which case, the major use of the building shall determine the occupancy classification.
(b) Forms of Occupancy Separation
Occupancy separations shall be vertical or horizontal or both, or when necessary, of such other
forms as may be required to afford a complete separation between the various occupancy divisions in the
(c) Types of Occupancy Separation
Occupancy separation shall be classified as “One-Hour Fire Resistive”, “Two-Hour FireResistive”, “Three-Hour Fire-Resistive” and “Four-Hour Fire-Resistive.”
(1) A “One-Hour Fire Resistive Occupancy Separation” shall be of not less than three-hour
fire-resistive construction. All openings in such separation shall be protected by a fire-assembly having
a one-hour fire-resistive rating.
(2) A “Two-Hour Fire Resistive Occupancy Separation” shall be of not less than two-hour
fire-resistive construction. All openings in such separation shall be protected by a fire assembly having a
two-hourfire-resistive rating. (3) A “Three-Hour Fire-Resistive Occupancy Separation” shall be of not less than three-hour
fire-resistive construction. All openings walls forming such separation shall be protected by a fire
assembly having a three-hour fire-resistive rating. The total width of all openings in any three-hour fireresistive occupancy separation wall in any one-storey shall not exceed 25 percent of the length of the
wall in that storey and no single opening shall have an area greater than 10.00 square meters.
all openings in floors forming a “Three-Hour Fire-Resistive Occupancy Separation” shall be protected
by vertical enclosures extending above and below such openings. The walls of such vertical enclosures
shall be of not less than two-hour fire-resistive construction, and all openings therein shall be protected
by a fire assembly having a three hour fire-resistive rating.
(4) A “Four-Hour Fire-Resistive Occupancy Separation” shall have no openings therein and
shall be of not less than four-hour fire-resistive construction.
(d) Fire Rating for Occupancy Separation
Occupancy Separations shall be pr...
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This note was uploaded on 09/22/2013 for the course ARIDBE AR taught by Professor Any during the Fall '12 term at Mapúa Institute of Technology.
- Fall '12