[3.2.3] Laying out Standoffs
Standoffs (
Figure 9
) are used to increase the height of the
array above the surface of the roof. Pair each standoff with a
flashing to seal the lag bolt penetrations to the roof.
Use
Figure 10 or 11
to locate and mark the location of the
standoff lag screw holes within the installation area. Remove
the tile or shake underneath each standoff location, exposing
the roofing underlayment. Ensure that the standoff base lies
flat on the underlayment, but remove no more material than
required for the flashings to be installed properly. The
standoffs must be firmly attached to the building structure.
If multiple high-profile rows are to be
installed adjacent to each other, it may
not be possible for each row to be
centered above the rafters. Adjust as
needed, following the guidelines of
Fig. 11
as closely as possible.
Installing Standoffs:
Drill 3/16 inch pilot holes through the
underlayment into the center of the
rafters at each standoff location. Apply
sealant to the hole. Securely fasten
5/16” lag screw with thread top.
SWH aluminum standoffs ( 1” O.D.)
are designed for collared flashings.
Install and seal flashings and standoffs
using standard building practices or
as the company providing roofing
warranty directs.
Figure 9. Standoff in
conjunction with an L-Bracket.
Figure 10. Layout with rails perpendicular to rafters
Note: Modules must be centered symmetrically on the rails
(+/- 2”) or accoring to manufacturer specifications.
25% of module
width
50% of module
width (TYP)
Overhang 25% L max
25% module
width each end
Foot Spacing /
Rail Span “L”
Rafters
(Building structure)
Lower roof edge
Figure 11. Layout with rails parallel to rafters.
Note: Modules must be centered symmetrically on the rails
(+/- 2”) or accoring to manufacturer specifications.
Overhang 25% L max
50% of module width
Rafters (Building structure)
Foot Spacing /
Rail Span “L”
Overhang 25% L max
Lower roof edge
9628 Valley Blvd. Rosemead, CA 91770 | Phone 626-579-3288 | [email protected]
SWH Solar Racking Installation Guide | Version 12.10.v2
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