adhesives are specified such as sprayed foam or hot
asphalt used with fleece-backed membrane.
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Layout membrane and side lap adjoining sheets in accordance with membrane
manufacturer's printed installation instructions. Allow for sufficient
membrane to form proper membrane terminations. Remove dusting agents and
dirt from membrane and substrate areas where bonding adhesives are to be
applied. Apply specified adhesive evenly and continuously to substrate
[and underside of sheets] at rates recommended by the roof membrane
manufacturer's printed application instructions. When adhesive is spray
applied, roll with a paint roller to ensure proper contact and coverage.
Do not apply bonding adhesive to surfaces of membrane in seam or lap areas.
Allow adhesive to flash off or dry to consistency prescribed by
manufacturer before adhering sheets to the substrate. Roll each sheet into
adhesive slowly and evenly to avoid wrinkles; broom or roll the membrane to
remove air pockets and fishmouths and to ensure full, continuous bonding of
sheet to substrate. Form field lap splices or seams as specified. Check
all seams and ensure full lap seal. Apply lap sealant to all adhesive
formed seams and all cut edges of reinforced membrane materials.
][3.2.3.3
Mechanically Fastened Membrane Application
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NOTE: Delete this paragraph unless a mechanically
fastened or combined fully adhered and mechanically
fastened application is specified.
Membrane side lap depends on method of mechanical
attachment, wind resistance testing of the specific
system provided, and requirements of the membrane
manufacturer. Generally, attachments shall be
positioned such that minimum 75 mm (3 inch) seam
width remains beyond the outer edge of the
attachment plate or batten strip. Fastener and
plate attachment typically requires 175 mm to 200 mm
(7 to 8 inch) membrane overlap. Batten attachment
typically requires 100 mm to 150 mm (4 to 6 inch)
membrane overlap.
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Layout membrane and lap adjoining sheets in accordance with membrane
manufacturer's printed instructions such that a minimum [75 mm (3
inch)][_____] seam width is maintained and seam width is as required by
tested assembly meeting specified wind resistance requirements. Account
for additional overlap required for placement of fasteners and plates or
battens beyond the closed seam. Allow for sufficient membrane to form
proper membrane terminations. Ensure membrane is free of wrinkles and
ridges in the installation. Mechanically secure the membrane sheet with
specified fasteners in the lap area. Space fasteners as required to
provide the wind uplift resistance specified and in accordance with
submitted fastener patterns for the field, corner, and perimeter roof
areas. Set fasteners firm to plate or batten. Form field lap splices or
seams as specified. Check all seams and ensure full lap seal. Apply lap
sealant to all adhesive formed seams and all cut edges of reinforced
membrane materials.
SECTION 07530
Page 23
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