Page
4
Installation Manual 201.1
SolarMount
®
Top Mounting
Laying out standoffs
Standoffs (Fig. 8) are used for fl ashed installations, such as those with
tile and shake shingles.
Use Figure 9 or Figure 10 to locate and mark the standoff lag bolt
holes within the installation area.
Consult UniRac’s
SolarMount Code-Compliant Planning
and Assembly
to determine foot spacing that will meet code.
Download the version for the applicable building code at
www.unirac.com.
Remove the tile or shake underneath each standoff location, exposing
the roofi ng underlayment. Ensure that the standoff base lies fl at on
the underlayment, but remove no more material than required for the
fl ashings to be installed properly.
Use the standoff base as a template to mark lag bolt hole locations on
underlayment above the center of the rafters (Fig. 9 or Fig. 10).
In low-profi le layouts, stagger standoffs on rafters (Fig. 9) to distrib-
ute the load.
When determining the distance between the rails in high-profi le
mode, keep in mind that the center of each rail will be offset from the
standoff lag bolt holes by
7
⁄
16
of an inch.
If multiple high-profi le rows are to be installed adjacent to each other,
it will not be possible for each row to be centered above the rafters.
Adjust as needed following the guidelines in Figure 10 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. Securely fas-
ten
each
standoff to the rafters
with the
two
5
/
16
" x 3
1
/
2
" lag
bolts provided with it.
Verify that the lag bolts you use
are adequate for your installa-
tion by following procedural
steps 4A or 4B (pp. 5, 8) in
SolarMount Code-Compliant
Planning and Assembly
.
If you are using raised-fl ange
standoffs, ensure that they face
as shown in Figure 9 or Figure
10. Steel fl attop standoffs
should also be lagged at oppo-
site corners.
SolarMount steel standoffs are
designed for in stal la tion with
collared fl ashings available from
UniRac. Aluminum fl ashings
take all metal fl ashings, also
available from UniRac.
Install and seal fl ashings and
standoffs using standard build-
ing practices.
Figure 8. SolarMount standoff choices: alumi-
num 2-piece (left), steel fl at-top (center), and
steel raised fl ange. Two-piece standoffs allow
fl ashings to be precisely placed over bases pri-
or to installation of the standoff itself. Raised
fl ange standoffs do not require L-feet.
Figure 9. Low-profi le layout
Figure 10. High-profi le layout
Overhang
Foot
spacing
Stagger standoffs on rafters
25% typical each end
50% typical
Lower roof edge
1
3
/
4
″
7
/
16
″
50% typical
25% typical
each end
Foot
spacing
Overhang
Lower roof edge
Rafters
7
/
16
″
