Flex Thermoplastic Adhered Roof Membrane - Manual (Page 3)

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B.) Position Flex Roof Membrane over the acceptable substrate. It is recommended to place
the sheets in a manner to install the membrane in the longest lengths possible. It is also
good practice to lay out the membrane sheets in a shingle fashion so that the seams are not
placed in position to buck the flow of water to the drain.
C.) Fold the one end of the sheet back so half the underside of the membrane is exposed.
D.) Apply the approved Flex Membrane Adhesive to the substrate and pull the membrane into
the adhesive. Consult the Flex technical data sheet for the adhesive for the recommended
coverage rate. (Coverage rates may vary with various substrates).
Flex FB Elvaloy or FB TPO membranes may be adhered with hot steep asphalt.
Apply hot steep asphalt as an adhesive at the asphalt manufacturers recommended EVT.
In cold weather application do not apply asphalt more than 3’ in front of the membrane
without placing the membrane into the asphalt.
E.) Pull and roll the membrane into the adhesive without wrinkling the membrane.
F.) Repeat the process with the other half of the sheet.
G.) Roll the membrane with a roller (200 lb. minimum) to embed the membrane into the
adhesive and remove any air pockets.
H.) Position the adjacent membrane sheet over the selvedge edge of the underlying sheet. The
edge must over lap over the length of the underlying membrane a minimum of 3” to insure
an adequate 1.5” hot air weld.
I.) Fleeceback Membranes. The ends of the membrane are trimmed to butt together and are
completed by hot air welding Flex 6”trim strip over the ends. The trim strip is to extend a
minimum of 1.5” past the selvedge edge.
2.10 Field Membrane Securement
A.) Hot air weld the seam and continue in sequence installing the remainder of the
sheets across the roof area.
B.) Mechanical securement must be provided at the perimeter edge of each roof level, roof
section, expansion joint or roof divider.
C.) Cold adhesive installations or installations in high velocity wind zones may require
additional securement at all roof penetrations and curbs, adjacent walls and at any
angle change where the slope exceeds 2:12.
D.) 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. Reroofing Flashing Conditions. Existing flashings must be removed prior to
installing the new Flex Flashing Membrane.
2. Termination Bar, surface mounted reglet, or surface mounted counter flashings
must be installed directly to the wall surface.