8 inches from the pipe and shall be set over the roof or floor membrane in
a troweled coating of bituminous cement. Flashing sleeve shall extend up
the pipe a minimum of 50 mm 2 inches above the highest flood level of the
roof or a minimum of 250 mm 10 inches above the roof, whichever is greater,
or 250 mm 10 inches above the floor. The annular space between the
flashing sleeve and the bare pipe or metal jacket covered insulation shall
be sealed as indicated. Pipes up to and including 250 mm 10 inches in
diameter passing through roof or floor waterproofing membrane may be
installed through a cast iron sleeve with caulking recess, anchor lugs,
flashing clamp device, and pressure ring with brass bolts. Waterproofing
membrane shall be clamped into place and sealant shall be placed in the
caulking recess.
3.1.5.2
Counterflashing
As an alternate to caulking and sealing the annular space between the pipe
and flashing sleeve or metal jacket covered insulation and flashing sleeve,
counterflashing may be by standard roof coupling for threaded pipe up to
150 mm 6 inches in diameter; lead flashing sleeve for dry vents and turning
the sleeve down into the pipe to form a waterproof joint; or tack welded or
banded metal rain shield round the pipe and sealing as indicated.
3.1.5.3
Sealing Uninsulated Pipes or Conduits
A modular mechanical type sealing assembly may be installed in lieu of a
waterproofing clamping flange and caulking and sealing, as specified, of
annular space between pipe and sleeve or conduit and sleeve. The seals
shall consist of interlocking synthetic rubber links shaped to continuously
fill the annular space between pipe/conduit and sleeve with corrosion
protected carbon steel bolts, nuts, and pressure plates. The links shall
be loosely assembled with bolts to form a continuous rubber belt around the
pipe with a pressure plate under each bolt head and each nut. After the
seal assembly is properly positioned in the sleeve, tightening of the bolt
shall cause the rubber sealing elements to expand and provide a watertight
seal between the pipe/conduit and sleeve. Each seal assembly shall be
sized as recommended by the manufacturer to fit the pipe/conduit and sleeve
involved. The Contractor electing to use the modular mechanical type seals
shall provide sleeves of the proper diameters.
3.1.6
Escutcheons
Escutcheons shall be provided at finished surfaces where exposed piping,
bare or insulated, passes through floors, walls, or ceilings except in
boiler, utility, or equipment rooms. Where sleeves project slightly from
floors, special deep type escutcheons shall be used. Escutcheons shall be
fastened securely to pipe or pipe covering and shall be chromium plated
iron or chromium plated brass, either one piece or split pattern, held in
place by internal spring tension or setscrew.
3.1.7
Clay Sewer Pipe
Pipe shall be installed where indicated for housing steam supply and
condensate return lines. The sewer pipe shall be installed on properly
graded and well tamped earth or gravel base. Joints shall be packed with
twisted jute packing and sealed with bituminous sealing compound or
portland cement mortar.
SECTION 15561A
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