Marking the Purlin Pipe (3’ and 4' Rafter Spacing)
Required 1.315” x 75” Swaged and 73.5” Plain pipe for the following lengths:
Building Length
75” Swaged Pipe
73.5” Plain pipe
48’
63
9
60’
81
9
72’
99
9
1. Beginning with a swaged pipe, assemble the first purlin by inserting the swaged end into the plain end of the next
swaged pipe.
2. Continue this pattern until all swaged pipes are connected and end with the plain pipe.
NOTE:
At this time, do not fasten the pipes together. After marking, each purlin will be disassembled and added to the
building in sections as the rafters are set in place.
3. Verify that all pipes are seated at the joints before marking the rafter spacing.
4. If your building is on 3’ Rafter Spacing, skip to and continue with Step 7.
If your building is on a 4’ Rafter Spacing, continue with Steps 5 and 6. After completing Step 6, skip to and continue
with Step 9.
5. (4' Rafter Spacing) With the purlin on the ground, measure 4' 0-3/4" from the end and make the first mark on the
purlin.
6. From this mark, layout the rafter spacing in 4' intervals. After the purlin is marked, continue with Step 9.
7. (3' Rafter Spacing) With the purlin on the ground, measure 3' 0-3/4" from the end and make the first mark on the
purlin.
8. From this mark, layout the rafter spacing in 3' intervals.
9. Repeat the above procedure until all purlins have been assembled and marked.
10. After assembling and marking all purlins, keep the pipes together and in an accessible place near the rafter assembly.
As rafters are added, each purlin will be used (pulled apart) and attached to the rafter assembly for support.
11. Continue by assembling the frame.
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