abnormal traffic during installation. Use only equipment with
rubber tires. Provide walkway protection where heavy traffic from
other trades is expected. Do not store material on membrane.
3.3.1
Butyl Rubber
Lap sheets at sides and ends a minimum of 150 mm 6 inches over the
preceding sheet. Apply lap splicing cement over entire 150 mm 6 inches
splice area prior to application of sealant. Sealant shall be continious
along the entire length of the splice. Maintain a continuous bead of
sealant at all membrane splices or as required by the manufacturer. When
membrane will be below water table, provide a tongue and groove cemented
splice a minimum of 150 mm 6 inches with factory made heat vulcanized seam
not less than 50 mm 2 inches or as required by the manufacturer.
3.3.2
Thermoplastic Membrane (PVC)
Deck shall be clean, smooth and dry without surface irregularities.
Consult with membrane manufacturer prior to grid application. Install
30.48 cm 12 inches wide sub-membrane containment grid as required by
manufacturer. Provide and install the containment grid at intervals across
the width and length of the substrate, at the base of all transitions,
walls, curbs, penetrations, and at the perimeter of each deck/substrate
section. Fully adhere strips to the deck in a full bedding of two-part
urethane adhesive medium. Adjacent sheets shall be welded in accordance
with manufacturer's instructions. All side and end lap joints shall be
hot-air welded. Lap area shall be a minimum of 7.62 cm 3 inch wide when
machine welding, and a minimum of 10.16 cm 4 inch wide when hand welding
but not less than recommended by the manufacturer. Overlaps shall be with
the flow of water.
3.4
Composite, Self-Adhering Membrane
Lap sheets at edges and ends a minimum of 65 mm 2 1/2 inches over the
preceding sheet. All side laps shall be minimum 65 mm 2 1/2 inchesand end
laps shall be 5 inches, 127 mm. Laps shall be self adhesive, mastic as per
manufacturer's recommendation. Roll or firmly press to adhere membrane to
substrate. Cover corners and joints with two layers of reinforcement by
first applying a 300 mm 12 inch width of membrane centered along the axis.
Flash drains and projections with a second ply of membrane for a distance
of 150 mm 6 inches from the drain or projection. Finish exposed,
terminated edges of membrane on horizontal or vertical surfaces with a
trowelled bead of mastic. Apply mastic around edges of membrane, and
drains and projections. Apply mastic at end of each work day.
3.5
FLASHING
Flash penetrations through membrane. Ensure that where reinforcing bars
penetrate a waterproofing membrane, each of those penetrations be sealed
with the appropriate sealant or mastic flashing component. Embed
elastomeric membrane in a heavy coat of adhesive, except for self-adhering
membrane. Continuous metal reglets shall be installed, horizontally on
footing and vertically on intersecting and connecting walls, and as
specified in Section 07600 FLASHING AND SHEET METAL. Metal reglets shall
receive exposed edges of membrane waterproofing. Secure membrane into
reglets by lead wedges and fill with cement as recommended by manufacturer
of waterproofing materials. Counterflash upper edge of membrane
waterproofing and protective covering as specified in Section 07600
SECTION 07131
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