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p r i d e o f t h e p a c i f i c S e r i e S c U r V e d M o d e L • G r e e n h o U S e i n S t r U c t i o n S
Larger greenhouses have purlins to increase strenght
in roof structures. A purlin can be a heavy or light
channel. It usually sits on top of a truss and is
bolted to the roofbars in the centre of he roof.
Heavy purlin
(at least 1/4” thick)
requires 1/4” x
3/4” bolts. Smaller greenhouses use a light channel
– bolts used are the same as the greenhouse bolts,
1/4” x 1/2.”
Installation of a purlin is a simple matter of sliding
the bolts into the roof bars and feastening the purlin
(see photos).
Bolt Purlin with the open side facing up if you wish
to use it for hanging baskets.
Poly Bar
1/2” x 1/4”
SS Bolt & Nut
Truss if
Required
1-1/2” x 3” x 3/16”
Purlin Support
NOTE:
1-1/2 x 1/2”
Tube Steel on
Models over
14 Feet
Appendix G – Purlin Installation