3.1.25
Sheet Metal Covering on Flat, Sloped, or Curved Surfaces
Except as specified or indicated otherwise, cover and flash all minor flat,
sloped, or curved surfaces such as crickets, bulkheads, dormers and small
decks with metal sheets of the material used for flashing; maximum size of
sheets, 375 by 455 mm 16 by 18 inches. Fasten sheets to sheathing with
metal cleats. Lock seams and solder. Lock aluminum seams and fill with
sealer as recommended by aluminum manufacturer. Provide an underlayment of
building paper for all sheet metal covering.
3.1.26
Expansion Joints
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NOTE: The contract drawings should contain details
of building expansion joints at walls, ceiling,
floors, roof, and parapets. Include exterior and
interior details. Provide isometric detailing for
expansion joints intersections.
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Provide expansion joints for roofs, walls, and floors as [specified]
[indicated]. [Expansion joints in continuous sheet metal shall be provided
at [40 foot intervals for copper and stainless steel] [and at 32 foot
intervals for aluminum], [aluminum gravel stops and fascias which shall
have expansion joints at not more than 12 foot spacing]. Joints shall be
evenly spaced. An additional joint shall be provided where the distance
between the last expansion joint and the end of the continuous run is more
than half the required interval spacing]. Conform to the requirements of
Table I.
3.1.26.1
Roof Expansion Joints
Consist of curb with wood nailing members on each side of joint, bituminous
base flashing, metal counterflashing, and metal joint cover. Bituminous
base flashing is specified in Roofing Section. Provide counterflashing as
specified in paragraph "Counterflashing," except as follows: Provide
counterflashing with vertical leg of suitable depth to enable forming into
a horizontal continuous cleat. Secure the inner edge to the nailing
member. Make the outer edge projection not less than 25 mm one inch for
flashing on one side of the expansion joint and be less than the width of
the expansion joint plus 25 mm one inch for flashing on the other side of
the joint. Hook the expansion joint cover over the projecting outer edges
of counterflashing. Provide roof joint with a joint cover of the width
indicated. Hook and lock one edge of the joint cover over the shorter
projecting flange of the continuous cleat, and the other edge hooked over
and loose locked with the longer projecting flange.
Joints are specified
in Table II.
3.1.26.2
Floor and Wall Expansion Joints
Provide U-shape with extended flanges for expansion joints in concrete and
masonry walls and in floor slabs. Cover plates for wall and floor joints
are specified in Section [05500 METAL: MISCELLANEOUS AND FABRICATIONS.]
[_____].
3.1.27
Flashing at Roof Penetrations and Equipment Supports
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SECTION 07600
Page 22
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