Base Cap Load Chart Polycarbonate Over Purlins

Base Cap Load Chart Polycarbonate Over Purlins and Wall Girts

Next See Base & Cap Install Details and do material take off

Recommended Loading lbs./sq. ft. 48″ wide Sheet – Also see Position & Attach Guidelines.

See Structural Load Page for further info on Snow and Wind Load.        Back To Base & Cap Page

Purlin Spacing
48″
45″
42″
36″
30″
28″
Bending Radius
8mm
NA
NA
NA
20 lbs.
35 lbs.
40 lbs.
8 Feet
10mm
NA
NA
20 lbs.
35 lbs.
50 lbs.
60 lbs.
8 Feet
16mm 3-Wall
20 lbs.
30 lbs.
35 lbs.
60 lbs.
75 lbs.
95 lbs.
9 Feet
Purlin Spacing
90″
75″
63″
54″
48″
36″
Bending Radius
16mm X-Wall
NA
NA
20 lbs.
35 lbs.
45 lbs.
80 lbs.
10 Feet
25mm X-Wall
20 lbs.
35 lbs.
50 lbs.
60 lbs.
80 lbs.
105 lbs.
No Bending

Sheet must be supported on all 4 edges, minimum of 1/2″ of sheet bearing on Base or frame. When using sheets cut along width, and no longer have rib at edge, position so first rib supported by minimum of 1/2″.

See 8-25mm Polycarb, some 20 year Warranty

Polycarbonate Greenhouse and Sunroom Building Supplies