Flex Membrane International Corp. 2670 Leiscz’s Bridge Road, Suite 400, Leesport, PA 19533 Tel: 610-916-9500 Fax: 610-916-9501
FLEX TPO PLUS MEMBRANE
ENHANCED WIND UPLIFT FASTENING REQUIREMENTS
The following is general information regarding Flex TPO Plus Roof System design requirements for areas
in which wind speed velocities may occur in excess of 55 miles per hour. A wind uplift pressure design
professional accredited in the specific area should calculate the wind uplift pressure resistance required for
the project. The wind uplift pressure resistance values can then be matched to existing approved Flex
Roof Assemblies. Contact Flex Technical Services for additional information regarding approved
assemblies.
A. Approved Decks:
Mechanically Fastened Roof Systems
1) Approved Decks (wind speeds to 72 mph)
a) 22 gauge steel
b) Structural concrete (3000 psi)
c) Wood Plank (1 1/2” min.)
d) CDX Plywood (5/8”min.)
e) OSB (7/16”min)
f) Lightweight Insulating concrete over steel deck
g) Gypsum
h) Cementitious Wood Fiber
2) Approved Decks (wind speeds to 80 mph)
a) 22 gauge steel
b) Structural concrete (3000 psi)
c) Wood Plank (1 ½” min.)
d) CDX Plywood (15/32”min.)
3) Approved Decks (wind speeds to 100 mph)
a) 22 gauge steel
b) Structural concrete (3000 psi)
c) Wood Plank (1 ½” min.)
Adhered Roof Systems
1) Approved Decks (wind speeds to 72 mph)
a) 22 gauge steel
b) Structural concrete (3000 psi)
c) Wood Plank (1 ½” min.)
d) CDX Plywood (5/8”min.)
e) OSB (7/16”min)
f) Lightweight Insulating concrete over steel deck
g) Gypsum
h) Cementitious Wood Fiber
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2) Approved Decks (wind speeds to 80 mph)
a) 22 gauge steel
b) Structural concrete (3000 psi)
c) Wood Plank (1 ½” min.)
d) CDX Plywood (5/8”min.)
e) OSB (7/16”min)
f) Lightweight Insulating concrete over steel deck
3) Approved Decks (wind speeds to 90 mph)
a) 22 gauge steel
b) Structural concrete (3000 psi)
c) Wood Plank (1 ½” min.)
d) CDX Plywood (15/32”min.)
e) Lightweight Insulating concrete over steel deck
4) Approved Decks (wind speeds to 120 mph)
a) 22 gauge steel
b) Structural concrete (3000 psi)
c) Wood Plank (1 ½” min.)
d) CDX Plywood (15/32”min.)
e) Lightweight Insulating concrete over concrete deck
B. Fastening Criteria:
Mechanically Fastened Roof Systems
1) Wind Speeds to 72 mph.
All decks minimum of 2 perimeter sheets. 8’ wide or 10’ wide field sheets Fasteners
12” o.c.
2) Wind Speeds to 80 mph.
Structural concrete decks Minimum of 4 perimeter sheets. 8’ wide or 10’ wide field sheets.
Fasteners 12” o.c.
Steel and Wood Decks Minimum of 3 perimeter sheets. 8’ wide or 10’ wide field sheets. Fasteners
12” o.c.
3) Wind Speeds to 90 mph.
Structural concrete decks, Steel and approved Wood Decks. Minimum of 3 perimeter
sheets. 8’ wide sheets fastened 12” o.c., 10’ wide sheets fastened 6” o.c.
4) Wind Speeds to 100 mph.
60 mil minimum membrane thickness.
Structural concrete decks, Steel and approved Wood Decks, Minimum of 2 perimeter
sheets fastened 6” o.c. 8’ wide sheets fastened 12” o.c. 10’ wide sheets fastened 6” o.c.
Adhered Roof Systems
1) Wind Speeds to 80 mph.
a) Polyisocyanurate Insulation Board (20 psi Min 1 ½” thick) 11 fasteners per 4’x 8’ board.
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b) 1/4” DensDeck Prime 12 fasteners per 4’x 8’ board.
c) 1/4" Securock Gypsum-Fiber 12 fasteners per 4’x 8’ board.
2) Wind Speeds to 90 mph.
a) Polyisocyanurate Insulation Board (25 psi Min 1 ½” thick) 16 fasteners per 4’x 8’ board.
b) 1/2” DensDeck Prime 12 fasteners per 4’x 8’ board.
c) 1/2" Securock Gypsum-Fiber 12 fasteners per 4’x 8’ board.
3) Wind Speeds to 100 mph.
a) 7/16” OSB over Flex ISO board. 17 Fasteners per 4’x 8’ board.
b) 5/8” DensDeck Prime 16 fasteners per 4’x 8’ board.
c) 5/8” Securock Gypsum-Fiber 16 fasteners per 4’x 8’ board.
4) Wind Speeds to 120 mph.
a) 7/16” OSB over Flex ISO board. 17 Fasteners per 4’x 8’ board.
b) 5/8” DensDeck Prime 24 fasteners per 4’x 8’board.
c) 5/8” Securock Gypsum-Fiber 24 fasteners per 4’x 8’ board.
Note: Fastener to be Flex Standard Insulation fastener with 3” metal insulation plate. Fastener density
listed above is for field of roof area. Fastener density must be increased a minimum of 60% in the roof
corner areas and 40% in the roof perimeter area.
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