Flex Thermoplastic Mechanically Attached Roof Membrane - Manual (Page 3)

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C.) The number of perimeter sheets, the fastening placement density, and the field membrane
securement is dependent on the wind uplift pressure resistance required by the project
specifications and physical location. Contact the Flex Technical Service Department for
assistance if required.
D.) Perimeter sheets are installed in a manner that picture frames the entire roof edge of each
roof section.
Note:
1) On projects where there are multiple roof levels and roof levels meet at a common wall, if
the difference in height of the roof levels is greater than 3’, the adjacent edge of the higher
level is determined to be the perimeter edge. The roof area of the lower level where it
meets the wall does not require perimeter sheets.
2) Expansion Joints, control joints, divider and fire walls in the field of the roof or roof ridges
with slopes less than 3:12 are not to be considered as part of the roof perimeter.
2.10 Field Membrane Securement
A.) The field membrane sheets are positioned so that adjoining field membrane sheets
overlap 5 1/2” to 6” at those locations where fasteners and plates are located.
Typically along the length of the membrane.
B.) The end roll sections are also mechanically fastened and overlapped 5 ½” to 6” to
cover the fastener and plate and provide for an adequate hot air weld.
C.) The membrane is secured at the approved fastener density with the appropriate type
of fastener and membrane plate approved for the deck and the wind uplift pressure
resistance.
D.) Unroll and position the sheet.
E.) Install a fastener and plate in one end of the sheet on the appropriate fastener mark.
Go to the opposite end of the sheet and pull sheet into position along the lay line and
install a fastener and plate at the appropriate mark. Place the remaining fasteners and
plates.
F.) Hot air weld the seam and continue in sequence installing the remainder of the sheets
across the roof area.
G.) Additional securement must be provided at the perimeter of each roof level, roof
section, expansion joint or roof divider, all roof penetrations and curbs, adjacent
walls and at any angle change where the slope exceeds 2:12.
H.) All seams must be completed by hot air welding the same day they are installed.
Thoroughly probe the seams with a seam probe and repair any voids or defects
discovered.
3.0
Flashing
A.) General Flashing Conditions
Flex Reinforced Flashing Membrane is to be installed for the flashing of parapet
walls, roof equipment curbs, expansion joints and roof dividers, and for most other
roof detail flashing areas. Flex non reinforced flashing membrane may be used for
those details where the use of pre-formed accessories cannot be installed such as certain
pipe penetrations, corners, and scuppers details.
1.) Re-roofing Flashing Conditions. Existing flashings must be removed prior
to installing the new Flex Flashing Membrane.