Flex TPO Mechnically Attached Systems Perimeter - Manual (Page 2)

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Wind
Velocity
Building
Height
Roof Deck Field
Membrane
Fastener
Density
≤ 100 mph ≤ 40’
Steel, Lightweight Concrete, Structural
Concrete, Wood Plank 12’ wide 12” o.c.
≤ 75’
Steel, Lightweight Concrete, Structural
Concrete, Wood 10’ wide 12” o.c.
≤ 75’
Cementitious Wood Fiber , Gypsum 8’ wide 12” o.c.
100 to 119
mph
≤ 40’
Steel, Lightweight Concrete, Structural
Concrete, Wood Plank 12’ wide 6” o.c. or 12”
o.c.
≤ 50’
Steel, Lightweight Concrete, Structural
Concrete, Wood 10’ wide 12” o.c.
≤ 40’
Structural Concrete 12’ wide 12” o.c.
≤ 75’
Structural Concrete 10’ wide 12” o.c.
≤ 50’
Cementitious Wood Fiber , Gypsum 8’ wide 12” o.c.
120 to 129
mph
≤ 75’
Steel, Lightweight Concrete 8’ wide 12” o.c.
≤ 50’ Structural Concrete 10’ wide 12” o.c.
≥ 130 mph ≤ 75’ Steel, Lightweight Concrete 10’ wide 6” o.c.
≤ 50’
Structural Concrete 8’ wide 12” o.c.
Notes:
1. Lightweight Insulating Concrete Decks must be installed over a steel deck.. The fasteners
must penetrate through the steel deck.
2. Cementitious Wood Fiber, Gypsum and Wood Decks are not acceptable for a mechanically
attached roof system installation in the ≥ 130 mph wind zone.
Fastener Pullout Requirements:
It is recommended that withdrawal resistance tests be performed when considering specifying a
mechanically attached roof system. If the installation is to be a retrofit or recover project the existing
roofing material must be removed to the deck and the pullout test performed to the uncovered deck. The
test is to be performed by a qualified and experienced individual certified by the fastener manufacturer.
Fastener installations must be tested in various locations of the roof including corner and perimeter areas.
A roof plan should be included with the submittal documenting the location of each pullout test and the
associated values. The following values are the minimum withdrawal resistance required for the roof
system installation.
Deck Type Min. Pullout Value System
Steel 22 gauge or heavier
500 lbs. Mechanically Fastened
360 lbs. Adhered
Steel lighter than 22 gauge
300 lbs. Adhered only
Lightweight Concrete on Steel
360 lbs. Mechanically Fastened
Adhered
Structural Concrete
800 lbs. Mechanically Fastened
Wood 360 lbs. Mechanically Fastened
250 lbs. Adhered
Cementitious
Wood Fiber or Gypsum
300 lbs. Mechanically Fastened