sufficient size and located so that the concealed items may be serviced,
maintained, or replaced. Access panels shall be as specified in Section
05500A MISCELLANEOUS METAL.
3.16.8
Sight Drains
Sight drains shall be installed so that the indirect waste will terminate
50 mm 2 inches above the flood rim of the funnel to provide an acceptable
air gap.
3.16.9
Traps
Each trap shall be placed as near the fixture as possible, and no fixture
shall be double-trapped. Traps installed on cast iron soil pipe shall be
cast iron. Traps installed on steel pipe or copper tubing shall be
recess-drainage pattern, or brass-tube type. Traps for acid-resisting
waste shall be of the same material as the pipe.
3.16.10
Shower Pans
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NOTE: Shower pans will be shown on the
architectural details. Shower pans may be omitted
for showers located on floors with slab-on-grade
construction, unless special local conditions
necessitate waterproofing. Pans will be omitted in
toilet facilities of patient rooms.
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Before installing shower pan, subfloor shall be free of projections such as
nail heads or rough edges of aggregate. Drain shall be a bolt-down,
clamping-ring type with weepholes, installed so the lip of the subdrain is
flush with subfloor. The floor of each individual shower, the shower area
portion of combination shower and drying room, and the entire shower and
drying room where the two are not separated by curbing or partition shall
be made watertight with a shower pan fabricated in place. The shower pan
material shall be cut to size and shape of the area indicated, in one piece
to the maximum extent practicable, allowing a minimum of 150 mm 6 inches
for turnup on walls or partitions, and shall be folded over the curb with
an approximate return of 1/4 of curb height. The upstands shall be placed
behind any wall or partition finish. Subflooring shall be smooth and
clean, with nail heads driven flush with surface, and shall be sloped to
drain. Shower pans shall be clamped to drain with the drain clamping ring.
3.16.10.1
Metal Shower Pans
When a shower pan of required size cannot be furnished in one piece, metal
pieces shall be joined with a flat-lock seam and soldered or burned. The
corners shall be folded, not cut, and the corner seam shall be soldered or
burned. Pans, including upstands, shall be coated on all surfaces with one
brush coat of asphalt. Asphalt shall be applied evenly at not less than 1
liter per square meter 1 gallon per 50 square feet. A layer of felt
covered with building paper shall be placed between shower pans and wood
floors. The joining surfaces of metal pan and drain shall be given a brush
coat of asphalt after the pan is connected to the drain.
3.16.10.2
Nonplasticized Chlorinated Polyethylene Shower Pans
Corners of nonplasticized chlorinated polyethylene shower pans shall be
SECTION 15405A
Page 98
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