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Installation, Operation & Maintenance
Roof hatch products may be installed on a flat or sloping roof with up to a 7:12 pitch. When installed on a
slope, the hinge side should run parallel with the slope.
1. Place the roof hatch over the existing opening in the roof. The roof rough opening dimensions are
equal to hatch dimensions as measured from the inside curb to inside curb. For example, a 36 inch by
30-inch fixed ladder access hatch will have a rough opening of 36 inches by 30 inches.
2. The roof hatch curb flange comes with two (2) types of mounting holes to accommodate multiple
fastening methods practiced and accepted at a local level.
a. Mark the pre-drilled 5/8-inch diameter holes from the mounting flange through the roof deck
or a concrete curb. Drill roof deck or concrete curb for installation of anchors or other fasteners
(provided by others). Bolt or otherwise fasten roof hatch curb flange to roof deck using 3/8 inch
or 1/2-inch bolts with washers.
b. Mark the pre-drilled 3/16-inch diameter holes from the mounting flange through to the roof
deck, typically into a built-up wood frame curb. Fasten roof hatch curb flange to framing using
roofing nailers and/or screws, recommended size #10.
3. Mark the pre-drilled 5/8-inch diameter holes from the mounting flange through to the roof deck or a
concrete curb. Drill roof deck or concrete curb for installation of anchors or other fasteners, provided
by others. Bolt or otherwise fasten roof hatch curb flange to roof deck using 3/8-inch or 1/2-inch bolts
with washers.
4. Install roofing material up to and surrounding the roof curb, and under the
counterflashing at the top of the curb. Use the EZ tab feature, figure 1, to provide
additional mechanical support to hold and secure roofing membrane. Lap and seal all
joints in roofing material to provide a weather-tight seal.
OPERATION
Single Point Latch (figure 2)
Open
1. Rotate latch handle Ž to open the cover.
2. Using the grab handle , push cover fully open until hold-open arm locks.
Close
1. Pull red handle Πto disengage hold-open arm.
2. Descend the ladder. Grasp the grab handle to slam door shut
BD_RH_BU_IOM.pdf
Personnel II Roof Hatch
Model(s): BRHU/BA3630/BA3636/BA4848/
BA3054/BG3630/BG3636/BG4848/BG3054
©2020 Babcock-Davis
Figure 1
Figure 2
2
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