folded against the upstand by making a pig-ear fold. Hot-air gun or heat
lamp shall be used in making corner folds. Each pig-ear corner fold shall
be nailed or stapled 15 mm 1/2 inch from the upper edge to hold it in
place. Nails shall be galvanized large-head roofing nails. On metal
framing or studs, approved duct tape shall be used to secure pig-ear fold
and membrane. Where no backing is provided between the studs, the membrane
slack shall be taken up by pleating and stapling or nailing to studding 15
mm 1/2 inch from upper edge. To adhere the membrane to vertical surfaces,
the back of the membrane and the surface to which it will be applied shall
be coated with adhesive that becomes dry to the touch in 5 to 10 minutes,
after which the membrane shall be pressed into place. Surfaces to be
solvent-welded shall be clean. Surfaces to be joined with xylene shall be
initially sprayed and vigorously cleaned with a cotton cloth, followed by
final coating of xylene and the joining of the surfaces by roller or
equivalent means. If ambient or membrane temperatures are below 4 degrees
C 40 degrees F, the membrane and the joint shall be heated prior to
application of xylene. Heat may be applied with hot-air gun or heat lamp,
taking precautions not to scorch the membrane. Adequate ventilation and
wearing of gloves are required when working with xylene. Membrane shall be
pressed into position on the drain body, and shall be cut and fit to match
so that membrane can be properly clamped and an effective gasket-type seal
provided. On wood subflooring, two layers of 0.73 kg per sq. meter 15 lb.
per 100 sq. feet dry felt shall be installed prior to installation of
shower pans to assure a smooth surface for installation.
3.16.10.3
Plasticized Polyvinyl Chloride (PVC) Shower Pans
Plasticized PVC shall be turned up behind walls or wall surfaces a distance
of not less than 150 mm 6 inches in room areas and 75 mm 3 inches above
curb level in curbed spaces with sufficient material to fold over and
fasten to outside face of curb. Corners shall be pig-ear type and folded
between pan and studs. Only top 25 mm 1 inch of upstand shall be nailed to
hold in place. Nails shall be galvanized large-head roofing type.
Approved duct tape shall be used on metal framing or studs to secure
pig-ear fold and membrane. Where no backing is provided between studs, the
membrane slack shall be taken up by pleating and stapling or nailing to
studding at top inch of upstand. To adhere the membrane to vertical
surfaces, the back of the membrane and the surface to which it will be
applied shall be coated with adhesive that becomes dry to the touch in 5 to
10 minutes, after which the membrane shall be pressed into place. Trim for
drain shall be exactly the size of drain opening. Bolt holes shall be
pierced to accommodate bolts with a tight fit. Adhesive shall be used
between pan and subdrain. Clamping ring shall be bolted firmly. A small
amount of gravel or porous material shall be placed at weepholes so that
holes remain clear when setting bed is poured. Membrane shall be solvent
welded with PVC solvent cement. Surfaces to be solvent welded shall be
cleaned free of grease and grime. Sheets shall be laid on a flat surface
with an overlap of about 50 mm 2 inches. Top edge shall be folded back and
surface primed with a PVC primer. PVC cement shall be applied and surfaces
placed together at once, while still wet. Joint shall be lightly rolled
with a paint roller, then as the joint sets shall be rolled firmly but not
so hard as to distort the material. On long lengths, about 600 or 900 mm 2
or 3 feet at a time shall be welded. On wood subflooring, two layers of
0.73 kg per sq. meter 15 psf felt shall be installed prior to installation
of shower pan to assure a smooth surface installation.
3.17
VIBRATION-ABSORBING FEATURES
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SECTION 15405A
Page 99
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