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d. Pre-cut and place a 2
’ piece of patch board
inside the seam created by the two
hipboards. Center and clamp in place.
e. With a 5/16" bit, pre-drill four holes as
shown through the patch board and the two
hipboards. Fasten with four 5/16"-18 x 3"
carriage bolts inserted from the outside and
secured with flat washers and 5/16" hex
nuts.
f.
Repeat step 5.b. for each of the remaining
bows the boards are attached to.
g. Continue on down the tunnel, repeating steps 5.c. through 5.f. until the last hipboard is in place and a
section of hipboard is protruding outward past the opposite end wall.
h. Cut the hipboard off flush with the outside of the end of the opposite end wall bow.
i.
Repeat steps 4.a. through 4.h. for the opposite side of the tunnel.
6.
Baseboards:
These are installed the same
way as the hipboards except for the
fasteners used to secure them and the need
to align them, since they lay flat against the
ground.
a. Measure and cut a 10
’ length of board to
be used as the first section of baseboard.
Clamp it to the ground posts on one side
of the tunnel. Similar to the first hipboard,
this 10
’ length will allow the baseboards
to be joined in between the bows, where
there is room to do so.
b. With a 5/16" drill bit, drill through the
ground post first, then through the
baseboard. Fasten the end of the
baseboard to the end wall ground post
with a 5/16"-18 x 7" J- bolt inserted from
the outside and secured with a flat
washer and two 5/16" hex nuts.
c. Clamp the next section of baseboard to
the tunnel ground posts so that it butts up
to previous one.
5.d., e.
6.a.
6.b.
7617.999 Rev 06/21/2021 | AL, JG, ms