3.2.17.1
Pipes Passing Through Waterproofing Membranes
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NOTE: Typical details of pipe sleeves through
walls, floors, and roofs are shown in TM 5-805-6.
The applicable detail plates will be completed and
included in the contract drawings.
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In addition to the pipe sleeves referred to above, pipes passing through
waterproofing membranes shall be provided with a 1.6 mm 4 pound lead
flashing or a 0.55 mm 16 ounce copper flashing, each within an integral
skirt or flange. Flashing shall be suitably formed, and the skirt or
flange shall extend not less than 200 mm 8 inches from the pipe and shall
set over the membrane in a troweled coating of bituminous cement. The
flashing shall extend above the roof or floor a minimum of 250 mm 10 inches.
The annular space between the flashing and the bare pipe or between the
flashing and the metal-jacket-covered insulation shall be sealed as
indicated. Pipes up to and including 250 mm 10 inches in diameter which
pass through 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.
3.2.17.2
Optional Modular Mechanical Sealing Assembly
At the option of the Contractor, a modular mechanical type sealing assembly
may be installed in the annular space between the sleeve and conduit or
pipe in lieu of a waterproofing clamping flange and caulking and sealing
specified above. The seals shall include interlocking synthetic rubber
links shaped to continuously fill the annular space between the
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 the sleeve. Each seal assembly shall be sized as
recommended by the manufacturer to fit the pipe/conduit and sleeve involved.
3.2.17.3
Optional Counterflashing
As alternates to caulking and sealing the annular space between the pipe
and flashing or metal-jacket-covered insulation and flashing,
counterflashing may consist of standard roof coupling for threaded pipe up
to 150 mm 6 inches in diameter, lead flashing sleeve for dry vents with the
sleeve turned down into the pipe to form a waterproof joint, or a
tack-welded or banded-metal rain shield around the pipe, sealed as
indicated.
3.2.17.4
Fire Seal
Where pipes pass through firewalls, fire partitions, or floors, a fire seal
shall be provided as specified in Section 07840 FIRESTOPPING.
3.2.18
Balancing Valves
Balancing valves shall be installed as indicated.
SECTION 15569A
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