15
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. Loosen the pivot bolt nut and adjustment nuts and plumb the
mast in two perpendicular directions (see Figure 16). If you
successfully plumb the mast, tighten the nuts and 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 appropriate
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 accurately to
keep the mast plumb. 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 hole 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 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. Replumb 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 screw snugly so that the base plate cannot move.
13. Tighten the adjustment nuts.
14. Replumb the mast. (Tightening the nuts can move the mast
off plumb.) Note: the mast must be plumb before proceed-
ing.
15. Repeat step 6 and step 7 to drill holes for the bottom center
hole.
Note: the base plate must not move when you drill the hole.
16. Fill the hole with silicone sealant.
Figure 15
Figure 16
Corner holes
Corner holes
Top center hole
Bottom center hole
Centerline
Rafter or truss
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
Mast
Plumb vial
Adjustment nut
(2 places)
Pivot bolt
Bubble must
be centered
between
marks
Carpenter's level
Bubble
T0053043
Summary of Contents for DiRECWAY DW4000
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