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15
b. Attach the end of a long tape measure to the end of
the ridge pole with a clamp, etc. and run the tape
measure reel to the opposite end of the tunnel.
Center it laterally and leave it hanging off the
opposite end wall bow so that its own weight is
keeping the tape taught.
c. Adjust the position of the peak of the next bow so
that it is 4
’ from the previous bow and secure the
ridge pole to that bow with a cross-connector.
d. Slide the non-swaged end of a piece of top-rail over
the swaged end of the ridge pole. Secure together
from beneath
with a #10 x 3/4" hex-head self-drilling
tek screw.
e. Using the tape measure as a guide, continue adding
top-rail and securing with cross-connectors as above
for the remaining length of the tunnel. When you
reach the opposite endwall, the top-rail will likely be
protruding past it. If this end will have scissor doors,
leave 6” protruding and cut off the rest. Otherwise cut
the pipe flush to the outside of the end wall and duct
tape over the end.
f.
Further secure all cross-connectors installed above
from inside the tunnel with #10 x 3/4" hex-head self-
drilling tek screws by screwing through the side of the
cross-connector and into the bow and also through
the side of the cross-connector and into the ridge
pole. This will prevent any slippage later on.
2.b.
2.c.
2.d.
2.e.
7617.999 Rev 06/21/2021 | AL, JG, ms
