- Load
Support-Blocking
Placement for Base & Cap When
setting poly on vertically running menbers
- Structural
Load, more on snow
& wind load.&&Also see Layout & Lexan Tech Data
- Also Poly
Position & Attach for mid-sheet attachment of roof & wall
sheets.
- Outside of structure to
center of first or last framing member & Base is 48-1/2".
- Dimension between
Intermediate framing members & Base is 48-3/4-49". 25mm
for 80-100 lb. load
-
|
Sheet
Thickness
|
Rafter
Spacing
|
35 lb.
load
|
45 lb.
load
|
60 lb.
load
|
|
8mm
|
48-3/4" to
49"
|
every 2.5
ft.
|
every 2
ft.
|
do not
use
|
|
10mm
|
48-3/4" to
49"
|
every 3
ft.
|
every 2.5
ft.
|
do not
use
|
|
16mm
|
48-3/4" to
49"
|
every 4
ft.
|
every 3
ft.
|
every 2.5
ft.
|
|
25mm
|
48-3/4" to
49"
|
every 5
ft.
|
every 4.5
ft.
|
every 3.5
ft.
|
Outside of
structure to center of first or last Base is 48-1/2".
- Dimension between
Intermediate framing members is 24-3/8" to 24-1/2".
- No spacers needed on
blocking, but hold back 1/4" from surface of poly. 25mm
for 80-100 lb. load
-
|
Sheet
Thickness
|
Rafter
Spacing
|
35 lb.
load
|
45 lb.
load
|
60 lb.
load
|
|
8mm
|
24-3/8" to
24-1/2"
|
not
needed
|
every 8
ft.
|
every 6
ft.
|
|
10mm
|
24-3/8" to
24-1/2"
|
not
needed
|
every 10
ft.
|
every 8
ft.
|
|
16mm
|
24-3/8" to
24-1/2"
|
not
needed
|
not
needed
|
not
needed
|
|
25mm
|
24-3/8" to
24-1/2"
|
not
needed
|
not
needed
|
not
needed
|
Load
in lbs./sq. ft. On roof slope over 7/12 snow tends to slide off.
Spacing may be relaxed. No specs available.
-
- • Blocking
required to support sheet. For condensation movement past blocking
set it 1/4" back from the outer surface of frame. For 48-3/4" to
49" on-center rafter spacing, place neoprene spacer at center of
blocking.
- • Sheet must be
supported on all 4 edges, minimum1/2" of sheet bearing on Base or
frame. If using sheets cut along width, and no longer have a rib
at edge, position so first rib supported by a minimum of
1/2".
- -
- Chart is mfg. specs to
select thickness, rafter or stud spacing & blocking placement
to support load on poly.
- Bldg. dept. has snow
& wind load. Ability to support load factor of frame strength
& poly. sheet rigidity. Follow chart and poly. will support
load. For wood frame member size see Spans
for Rafters. Get bldg.
dept. approval.
- -
- Cost
& Tech Info
-----Trim
& Hardware
-----Install
Details
-----Quote
& Order
-----Discounts
- -
- Framing & Install Guides in pdf. A crucial read.