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Standing-Seam Roofing

shown, fig, sheets, gutter, seam, roof, flashing and fastened

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STANDING-SEAM ROOFING Another form of metal roofing is that known as standing seam, which is used on steep roofs not less than s pitch, or a the width of the building. It consists of metal sheets whose cross or horizontal seams are locked as in flat seam roofing, and whose vertical seams are standing locked Seams, as will be described in connection with Figs.

220 to 229 inclusive. Assume that 14 x 20-inch sheets are used and the sheets are edged on the 20-inch sides only, as shown by A in Fig. 220, making the sheet 13 x 20 inches. After the required number of sheets have been edged, and assuming that the length of the pitched roof is 30 feet, then as many sheets are locked together as will be required, and the seams are closed with the mallet and soldered. In practice these strips are prepared of the required length in the shop, painted on the underside, and when dry are rolled up and sent td the building.

If desired they can be laid out at the build ing, which avoids the buckling caused by rolling and transportation from the shop to the job.

After the necessary strips have been prepared they are bent up with the roofing tongs, or, what is better and quicker, the roofing edger for standing-seam roofing. This is a machine into which the strips of tin are fed, being dis charged in the required bent form shown at A or B in Fig. 221, bent up 1 inch on one side and 1f inches on the other side.

Or the machine will, if desired, bend up If inches and 11 inches, giving a finch finished doubled seam in the first case and a 1-inch seam in the second. When laying standing-seam roofing, in no case should any nails be driven into the sheets. This applies to tin, copper or galva nized iron sheets. A cleat should be used, as shown in Fig. 222, which also shows the full size for laying the sheets given in Fig. 221. Thus it will be seen in Fig. 222 that I inch has been added over the measure ments in Fig. 221, thus allowing edges.

These cleats shown in Fig. 222 are made from scrap metal; they allow for the expansion and traction of the roofing and are used in practice as shown in Fig. 223, which represents the first operation in laying a standing-seam roof, and in which A represents the gutter with a rock attached at B. The gutter being fastened in position by means of cleats under the lock B—the same as in flat seam roofing—the standing seam strips are laid as follows: Take the strip C and lock it well into the lock B of the gutter A as shown, and place the cleat shown in Fig.

222 tightly against the upright bend of the strip C in Fig. 223 as shown at D, and fasten it to the roof by means of a 1-inch roofing nail a.

Press the strip C firmly onto the roof and turn over edge b of the cleat D. This holds the sheet C in position. Now take the next sheet E, press it down and against the cleat D and turn over the edge d, which holds E in position. These cleats should be placed about 18 inches apart and by using them it will be seen that no nails have been driven through the sheets, the entire roof being held in position by means of the cleats only.

The second operation is shown in Fig. 224. By means of the hand double seamer and mallet or with the roofing double reamers and squeezing tongs, the single seam is made as shown at a. The third and last operation is shown in Fig. 225 where by the use of the same tools the doubled seam a is obtained. In Fig. 226 is shown how the finish is made with a comb ridge at the top. The sheets A A A have on the one side the single edge as shown, while the opposite side B has a double edge turned over as shown at a. Then, standing seams b b b are soldered down to e.

In Fig. 227 is shown how the side of a wall is flashed and counter flashed. A shows the gutter, B the leader or rain water conductor, and C the lock on the gutter A, fastened to the roof boards by cleats 9S shown at D. The back of the gutter is flashed up against the wall as high as shown by the dotted line E. F represents a standing-seam strip locked into the gutter at II and flashed up against the wall as high as shown by the dotted line J J. As the flashing J J E is not fastened at any part to the wall the beams or wall can settle without disturbing the flashing. The counter or cap flashing K K K is now stepped as shown by the heavy lines, the joints of the brick work being cut out to allow a one-inch flange d d d etc. to enter. This is well fastened with flashing hooks, as indicated by the small dots, and then made water tight with roofer's cement. As will be seen the cap flashing overlaps the base flashing a distance indicated by J J and covers to L L; the corner is double seamed at a b. M shows a sectional view through the gutter showing how the tubes and leaders are joined. The tube N is flanged out as shown at i i, and soldered to the gutter; the leader 0 is then slipped over the tube N as shown, and fastened.

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