Standing-Seam Joints (cont.) A double-lock standing-seam roof is begun by bending up the edges of
a strip of roofing 1½ and 1¾ inches, as shown at "a"
and "b" in Fig. 25. Cleats
a, Fig. 26, are nailed to the roof boards to
hold the roofing firmly in place. The top of the cleat reaches only to
the top of the upturned edge of the flange "b", or
1¾ inches. The next sheet of roofing "c", Fig.
27, is placed over and against the cleat "a",
the flange is only 1½ inches in height. |
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| The ¼-inch projection 1¾ of the flange "b" above the flange "d", together with the ends of the cleats "a", are folded over the top of the flange "d", as shown in Fig. 28 (a). A section of the seam is shown in Fig. 28 (b). The seam is immediately folded again, and tightly pressed together, as shown in Fig. 29 (a). This completes the seam, which stands about 1¼ inches above the roof. |
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