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Installing the .98 m mount
on a wood-framed roof:
Chapter 4 • Installing mounts
38
1035678-0001 DRAFT Revision 1.04
If specified in the customer-specific installation specification, you
can install the satellite dish onto a wooden roof. The minimum
size for roof truss members is 2 inches x 4 inches. Roof rafters
discussion
must be nominal 2x material (2x4, 2x6, etc.) Either size roof
rafters or trusses must be 16 to 24 inches on center. The roof
surface must consist of relatively thin, resilient materials, such as
asphalt or composite shingles, sheet metal, or similar materials,
over wood sheathing with a thickness of 3/4 inch or less. Satellite
dishes cannot be installed on slate roofs or Spanish tile roofing
made of clay or other brittle materials. The roof pitch (or slope)
must be between 3:12 and 12:12.
All center hole lag screws must be centered in the rafter or truss
to which they are attached. For this reason, you must be able to
locate rafters and trusses and the center of rafters and trusses with
a high degree of accuracy, which can be difficult to do. Home
construction varies a lot. Construction styles, materials, and
dimensions can all vary widely. In addition, stud finders give false
readings on a multi-layered surface, such as a roof. Also, you
need experience in home construction to be able to determine the
exact location of rafters and trusses and their centers. The satellite
dish should not be installed on a wood framed roof unless the
interior of the roof is unfinished so that placement of lag screws
can be verified and the rafters or trusses reinforced if necessary.
Large timber roofs with frequent spacing of members are also
permitted. These are constructed of wood members larger than
the nominal 2x sizes, and include post and beam structures with
members from 4 inches x 4 inches and larger. The members
cannot be spaced more than 24 inches on center. Their physical
properties must match or exceed those of Spruce-Pine-Fir #2.
Figure 9 shows a sample illustration of a mount on a wood
framed roof.
CAUTION
• These types of wooden roof installs typically DO NOT
restrict access via a door or attached ladder.
• Ensure the tenants and owners of the building
understand they MUST detach the indoor unit (IDU)
power cord from the power source before going on the
roof.
• Glue or securely tape the Radiation Caution Hazard Sign
to the back of the antenna.
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