- Base & Cap Load Chart
and Bending Radius for Roof Purlin & Wall Girt
Framing
- ( Bending Radius for both polycarbonate and Base & Cap )
-
- Recommended Loading
lbs./sq. ft. 48" wide Sheet -
Also see
Position
& Attach Guidelines.
- See Structural
Load Page
for further explanation of snow and wind
load Also see Lexan Tech Data.
-
-
|
Purlin
Spacing
|
48"
|
45"
|
42"
|
36"
|
30"
|
28"
|
Bending
Radius
|
|
8mm
Poly
|
15
lbs.
|
20
lbs.
|
25
lbs.
|
30
lbs.
|
35
lbs.
|
40
lbs.
|
8
Feet
|
|
10mm
Poly
|
20
lbs.
|
25
lbs.
|
30
lbs.
|
35
lbs.
|
50
lbs.
|
60
lbs.
|
8
Feet
|
|
16mm
Poly
|
30
lbs.
|
35
lbs.
|
40
lbs.
|
50
lbs.
|
65
lbs.
|
75
lbs.
|
9
Feet
|
|
25mm
Poly
|
45
lbs.
|
52
lbs.
|
60
lbs.
|
70
lbs.
|
80
lbs.
|
90
lbs.
|
15
Feet
|
- 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".
- -
- Chart is poly. mfg.
specs for selecting sheet thickness, rafter spacing and
blocking placement to support loads on
poly. Chart
may be used for roof or wall design.
- -
- Local bldg. dept. provides
snow & wind load for your area. Ability to support
load factor of frame strength and poly. sheet rigidity. Follow
chart above and poly. sheet will support load.
- -
- Bending Base & Cap for
arched roofs and quonsets. Limit length of arched roof to 24
ft. or use 2 sheets as shown in Arch-Quonset
Ridge. Bending
polycarbonate increases snow load, so purlin spacing can be
further apart. Note that strong winds can lift sheets off so do
not deviate to far from spacing in chart above.
- -
- • Cost
& Tech--• Trim
& Hdwr---• Read Frame
& Install
pdf Guides-• Poly
Select
-
- See
Install
Details &
Photos
& Plans -----
Cost
& Tech Info
- System
Specified over steel truss frame
• Estimated
materials to cover 28' x 48'
frame
-
-
- -Samples
& Guide
--Questions
-
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Terms
-
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& Order