Flex TPO Mechnically Attached Systems Perimeter User Manual

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
MECHANICALLY ATTACHED ROOF SYSTEMS
PERIMETER SHEET REQUIREMENTS AND FASTENER GUIDE
Perimeter Sheets:
The height of the building and the wind uplift pressure requirements of the project are factored to determine the number of perimeter sheets to install. A minimum of one perimeter sheet is required. Sloped roof assemblies equal to or greater than a 2:12 slope require a minimum of one perimeter sheet to be installed centered over the roof ridge.
Buildings that have canopies or overhangs or large openings in the walls require the additional installation of perimeter sheets in these areas. Contact Flex Technical Services for assistance in determining the number of perimeter sheets to install in these roof areas.
The following chart is provided to act as a general guide to assist in calculating the perimeter sheets required for most installations. The project specifications, Building Code requirements or Factory Mutual approval may dictate fastener/plate placement options and the installation of additional rows of perimeter sheets with enhanced membrane securement.
Wind Velocity Building Height Number of Perimeter Sheets Required
100 mph 50
50 to 75
100 to 129 mph 75 2 **
130 mph 75 4
Notes:
1. Fastener assembly spacing for perimeter sheets is the same as required for the fastener spacing of the roof field area sheets. * Installation of 12 wide membrane requires 2 rows of perimeter sheets fastened 12 o.c. ** Gypsum or Cementitious Wood Fiber Decks in the 100 to 129 mph wind zone require installing 3 rows of perimeter sheets.
The following chart is provided to act as a general guide to assist in determining the fastener density required for most installations. The project specifications, Building Code requirements or Factory Mutual approval may dictate fastener/plate placement options other than those listed below.
1 or 2 *
2
8/2012 1
Wind
Velocity
100 mph 40 Steel, Lightweight Concrete, Structural
75 Steel, Lightweight Concrete, Structural 75 Cementitious Wood Fiber , Gypsum 8 wide 12 o.c.
100 to 119
mph
50 Steel, Lightweight Concrete, Structural 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
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:
Building
Height
Concrete, Wood Plank
Concrete, Wood
40 Steel, Lightweight Concrete, Structural
Concrete, Wood Plank
Concrete, Wood
75 Steel, Lightweight Concrete 8 wide 12 o.c.
Roof Deck Field
Membrane
12 wide 12 o.c. 10 wide 12 o.c.
12 wide 6 o.c. or 12 10 wide 12 o.c.
Fastener
Density
o.c.
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
Steel lighter than 22 gauge 300 lbs. Adhered only Lightweight Concrete on Steel 360 lbs. Mechanically Fastened
Structural Concrete 800 lbs. Mechanically Fastened Wood 360 lbs. Mechanically Fastened
Cementitious Wood Fiber or Gypsum 300 lbs. Mechanically Fastened
360 lbs. Adhered
Adhered
250 lbs. Adhered
8/2012 2
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