3.1.4
Cleats
Provide cleats for sheet metal 450 mm 18 inches and over in width. Space
cleats evenly not over 300 mm 12 inches on centers unless otherwise
specified or indicated. Unless otherwise specified, cleats shall be not
less than 50 mm wide by 75 mm long 2 inches wide by 3 inches long and of
the same material and thickness as the sheet metal being installed. Secure
one end of the cleat with two nails and the cleat folded back over the
nailheads. Lock the other end into the seam. [Where the fastening is to
be made to concrete or masonry, screws shall be used and shall be driven in
expansion shields set in concrete or masonry. ]Pretin cleats for soldered
seams.
3.1.5
Bolts, Rivets, and Screws
Install bolts, rivets, and screws where indicated or required. Provide
compatible washers where required to protect surface of sheet metal and to
provide a watertight connection. Joints in aluminum sheets 1.0 mm 0.040
inch or less in thickness shall be mechanically made.
3.1.6
Seams
Straight and uniform in width and height with no solder showing on the face.
3.1.6.1
Flat-lock Seams
Finish not less than 20 mm 3/4 inch wide.
3.1.6.2
Lap Seams
Finish soldered seams not less than 25 mm one inch wide.
Overlap seams not
soldered, not less than 75 mm 3 inches.
3.1.6.3
Loose-Lock Expansion Seams
Not less than 75 mm 3 inches wide; provide minimum 25 mm one inch movement
within the joint. Completely fill the joints with the specified sealant,
applied at not less than 3 mm 1/8 inch thick bed. Sealants are specified
in Section 07920 JOINT SEALANTS.
3.1.6.4
Standing Seams
Not less than 25 mm one inch high, double locked without solder.
3.1.6.5
Flat Seams
Make seams in the direction of the flow.
3.1.7
Soldering
Where soldering is specified, it shall apply to copper, terne-coated
stainless steel, zinc-coated steel, and stainless steel items. Edges of
sheet metal shall be pretinned before soldering is begun. Seal the joints
in aluminum sheets of 0.040 inch or less in thickness with specified
sealants. Do not solder aluminum.
3.1.7.1
Edges
Scrape or wire-brush the edges of lead-coated material to be soldered to
SECTION 07600
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