21
GROWSPAN
™
ROLLING PREMIUM HIGH TUNNELS
Revision date: 01.01.16
12. Continue adding rafters, castor assemblies, and purlin pipe until the frame is assembled.
Remember to secure
each purlin splice using a Tek screw.
Complete the frame assembly using the final end rafter. Review Step 1 to
properly set the end rafter.
FRAME ASSEMBLY (continued)
NOTE:
Finish each purlin run using a plain 131P0735 pipe.
Consult the Side Profile diagram in the Quick Start if
needed.
If, after installation, the last end rafter is plumb and the purlins extend beyond the end of the rafter, cut the
last section of purlin pipe to the required length.
Typically purlin pipes do not require cutting.
Verify that you have the correct plain pipes to complete the purlin
runs before you decide to cut any pipe.
If the purlin is too short to fit into the rafter end clamps without pulling the end rafter out of plumb, first verify you have
the correct pipe. Also, check that the end clamps are properly installed—see View 6 detail on page 48. If so, loosen a
purlin splice and slide the pipes apart. At least half of the tapered end must remain inside the adjacent pipe. Drive the
Tek screw back into the pipe to secure the purlin joint.
13. Install the cross beam purlin as described in the following procedure.
