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INSTALLING THE MAST ON A WOOD FRAMED ROOF
4. With an assistant place the base plate on the centerline at the
spot you plan to install it (see Figure 15).
5. Plumb the mast in two perpendicular directions (Figure 16).
If you successfully plumb the mast proceed to step 6. If you
cannot plumb the mast find another location to install the
satellite dish. Note: it is essential that the mast be plumb. If
you cannot make the mast plumb at this point, find another
installation site.
6. Mark the center of the base plate's top center hole
(Figure 15).
7. Drill a hole on the center mark in the manner described
below.
Note: to avoid drilling too deeply, wrap a piece of masking tape
around the drill bit shank at the proper depth so that you can see
when you should stop drilling.
Drill a 1/8-inch pilot hole 2 inches deep.
Going into the pilot hole, drill a 1/4-inch hole 4 inches deep.
Going into the 1/4-inch hole, drill a 3/8-inch hole to a depth
equal to the unthreaded portion of the 3/8-inch x 4-inch lag
screw.
Note: You must mark the center of all screw holes accu-
rately. A Stanley Jumbo Self Centering Nail Set or similar
product will produce the best results. A #6 washer can also
be used to guide your pencil as it marks the hole center.
8. Apply silicone sealant in the holes and to the entire back
side of the base plate. Apply enough so that it will press out
around the edges when the plate is fastened down.
9. Install a 3/8-inch washer on a 3/8-inch x 4-inch lag screw.
10. Use a 9/16-inch socket wrench to screw the lag screw into
the top center hole of the base plate (see Figure 15). You
may need to swing the mast out of the way temporarily.
Tighten the screw snugly so that the base plate can barely
move.
Note: Do not pound the lag screws into the rafter or truss with a ham-
mer or mallet. Doing so may split the wood and render the rafter or
truss unusable.
11. Re-plumb the mast in two perpendicular directions as you
did in step 5. You may need to make adjustments to the mast
and/or the base plate. If you adjust the base plate, do not
move the center of the bottom center hole off the centerline
more than 1/16-inch.
12. Tighten the lag screw snugly so the base plate cannot move.
13. Use a 1/2-inch socket wrench to tighten the adjustment nuts.
14. Re-plumb the mast. (Tightening the nuts can move the mast
off plumb.) Note: the mast must be plumb before proceed-
ing.
15. Adjusting the drilling depth for the 3/8-inch by 2-inch lag
screws, repeat steps 6 and 7 to drill holes for the four corner
holes. See Figure 15.
Note: the base plate must not move when you drill the holes.
Centerline
Corner holes
Top center hole
Rafter or truss
Bottom center hole
Corner holes
Figure 15
Carpenter's level
Plumb vial
Bubble
Bubble must
be centered
between
marks
Mast
Pivot bolt
Adjustment nut
(2 places)
Figure 16
Center hole lag
screws are 3/8 inches
by 4 inches
Corner lag screws
are 3/8 inches
by 2 inches
Mast
(top view)
Level
T00530
17
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