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Last Updated
16th of July, 2010
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Clearance on Rooftop Equipment
SECTION 1522
HIGH-VELOCITY HURRICANE ZONES—
ROOFTOP STRUCTURES AND COMPONENTS
1522.1 Rooftop structures. Rooftop structures shall be
designed and constructed in accordance with the Florida
Building Code.
1522.2 Rooftop mounted equipment. All rooftop equipment
and supports shall be secured to the structure in compliance
with the loading requirements of Chapter 16 (High-Velocity
Hurricane Zones). The use of wood “sleepers” shall not be permitted.
Where equipment and appliances requiring access are
installed on roofs or elevated structures at a height exceeding
16 feet (4877 mm), such access shall be provided by a permanent
approved means of access, the extent of which shall be
from grade or floor level to the equipment and appliances’level
service space. Such access shall not require climbing over
obstructions greater than 30 inches (762 mm) high or walking
on roofs having a slope greater than 4 units vertical in 12 units
horizontal (33-percent slope).
Permanent ladders installed to provide the required access
shall comply with the following minimum design criteria:
1. The side railing shall extend above the parapet or roof
edge not less than 30 inches (762 mm).
2. Ladders shall have rung spacing not to exceed 14 inches
(356 mm) on center.
3. Ladders shall have a toe spacing not less than 6 inches
(152 mm) deep.
4. There shall be a minimum of 18 inches (457 mm)
between rails.
5. Rungs shall have a minimum 0.75-inch (19 mm) diameter
and be capable of withstanding a 300-pound (136.1
kg) load.
6. Ladders over 30 feet (9144 mm) in height shall be provided
with offset sections and landings capable of withstanding
100 pounds (488.2 kg/m
2
) per square foot.
7. Ladders shall be protected against corrosion by
approved means.
Catwalks installed to provide the required access shall be not
less than 24 inches (610 mm) wide and shall have railings as
required for service platforms.
Exception: This section shall not apply to Group R-3 occupancies.
Minimum clearances below roof-mounted
mechanical units shall be in accordance with Section
1509.7, Florida Building Code, Building.
1522.3 Machinery, piping, conduit, ductwork, signs and similar
equipment may be mounted on roofs in compliance with the
following:
1522.3.1 Permanently mounted rooftop equipment shall be
installed to provide clearances, in accordance with Table
1522.3, to permit repairs, replacement and/or maintenance of
the roofing system or any of its components.
TABLE 1522.3
ROOF MOUNTED EQUIPMENT HEIGHT REQUIREMENTS
WIDTH OF EQUIPMENT (in.) || HEIGHT OF LEGS (in.)
Up to 24 ||14
25 to 36 ||18
37 to 48 || 24
49 to 60 ||30
61 and wider ||48
For SI: 1 inch = 25.4 mm.
1522.3.2 When reroofing, recovering, performing repair or
roof maintenance, and where the roof top equipment is
moved to properly execute such work, the minimum clearances
of the said equipment support shall be in accordance
with Table 1522.3.
1522.3.3 In buildings where the existing rooftop equipment,
in the opinion of the building official, provides sufficient
clearance to repair, recover, replace and/or maintain
the roofing system or any of its components, such existing
equipment need not comply with Table 1522.3.
1522.3.4 Electrical conduit, mechanical piping or any other
service lines running on the roof shall be raised not less than
8 inches (203 mm) above the finished roof surface.
1522.3.5 Condensate lines shall not drain on the roofing
system or any of its components. Condensate lines need not
comply with the minimum clearance requirements.
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