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C R O S S C O U N T R Y F I V E - W A L L S E R I E S S T R A I G H T L E A N T O • 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 perlins to increase strenght
in roof structures. A perlin 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 perlin
(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 perlin is a simple matter of sliding
the bolts into the roof bars and feastening the perlin
(see photos).
Bolt Perlin 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”
Perlin Support
NOTE:
1-1/2 x 1/2”
Tube Steel on
Models over
14 Feet
Appendix E – Perlin Installation
