17
CLEARSPAN
™
MAJESTIC GREENHOUSES
Revision date: 06.21.16
ATTACH THE BOTTOM PURLINS
After installing the upper five (5) purlins, complete these
steps to install the remaining purlins.
Required tools:
• Tape measure
• Permanent marker
ATTENTION:
The bottom purlins run on the inside of the
rafter legs near the bottom of those rafter legs.
1. Begin at one end of the frame assembly and measure
up 13-1/2" from the rafter foot mounting plate on the
end rafter and make a mark on the inside of the rafter
leg.
NOTE:
This mark and the remaining marks identify the
location of the bottom purlin for each side.
The mark
identifies the center of the purlin
.
2. After marking the end rafter, attach a pipe strap to the
inside of the rafter leg so that the strap is positioned
with the mark at its center. Do not tighten the strap Tek
screws at this time.
3. Move to the remaining leg on the same rafter assembly
and mark as instructed in the previous steps.
4. Repeat Steps 1-3 for the remaining end rafter
assembly.
5. On the first inside rafter assembly, measure the same
distance (13-1/2") up the rafter leg from the foot base
and mark the location on the outside of the leg.
13-1/2"
6. After marking the location of the center of the bottom
purlins on the legs, place a cross-connector at the base
of each leg of each inside rafter assembly.
ATTENTION:
Attach pipe straps to the end rafters
only (Fig. 1). Cross-connectors are used to secure the
bottom purlins to the inside rafter assemblies (Fig. 2).
7. Assemble the first two sections of another purlin, insert
through the cross-connector on the inside rafter leg,
and insert the end into the pipe strap attached to the
end rafter (see below).
8. Tighten the Tek screws to secure the pipe strap to the
end rafter leg as described for the other purlins.
Figure 1
Figure 2
Tek Screw
9. Install a Tek screw (FA4484) through the pipe strap and
into the purlin to anchor the purlin in place.
