lock-type longitudinal seam. Except in pipe chases or interior walls, the
annular space between pipe and sleeve or between jacket over insulation and
sleeve in nonfire rated walls and floors shall be sealed as indicated and
specified in Section 07920 JOINT SEALANTS, and in fire rated walls and
floors shall be sealed as indicated and specified in Section 07840
FIRESTOPPING. Metal jackets for insulated pipes passing through exterior
walls, firewalls, fire partitions, floors, and roofs shall not be thinner
than 0.15 mm 0.006 inch thick aluminum if corrugated, and 0.41 mm 0.016 inch
thick aluminum if smooth, and shall be secured with aluminum or stainless
steel bands not less than 9.5 mm 3/8 inch wide and not more than 200 mm 8
inches apart. Where penetrating roofs, before fitting the metal jacket
into place, a 13 mm 1/2 inch wide strip of sealant shall be run vertically
along the inside of the longitudinal joint of the metal jacket from a point
below the backup material to a minimum of 900 mm 36 inches above the roof.
If the pipe turns from vertical to horizontal, the sealant strip shall be
run to a point just beyond the first elbow. When penetrating waterproofing
membrane for floors, the metal jacket shall extend from a point below the
backup material to a minimum distance of 50 mm 2 inches above the flashing.
For other areas, the metal jacket shall extend from a point below the
backup material to a point 300 mm 12 inches above floor; or when passing
through walls above grade, jacket shall extend at least 100 mm 4 inches
beyond each side of the wall.
3.4.1.1
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 included in the
contract drawings.
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In addition to the pipe sleeves referred to above, pipes passing through
roof or floor waterproofing membrane shall be provided with a 1.8 kg 4 pound
lead flashing or a 448 g 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 roof or floor membrane in a troweled coating of bituminous
cement. The flashing shall extend up the pipe a minimum of 250 mm 10 inches
above the roof or floor. 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 passing through roof or floor waterproofing membrane may be
installed through a galvanized steel 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. In lieu of a waterproofing clamping flange
and caulking and sealing of annular space between pipe and sleeve or
conduit and sleeve, a modular mechanical-type sealing assembly may be
installed. The seals shall consist of 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 bolts shall cause the rubber sealing elements
to expand and provide a water-tight 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. The Contractor
SECTION 15559A
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