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1952 Theatre Catalog, 10th Edition, Page 229 (195)

1952 Theatre Catalog, 10th Edition
1952 Theatre Catalog
1952 Theatre Catalog, 10th Edition, Page 229
Page 229

1952 Theatre Catalog, 10th Edition, Page 229

Length of Sheet Number of Nails

6 feet 13 '7 feet 15 8 feet 17 9 feet 19 10 feet 22 ll feet 24 12 feet 26

The above is based on average roof sizes of approximately 24 squares each. Siding application requires about 10 per cent less nails than roofing.

Nail only through the top or crown of corrugations, and be careful not to overdrive and crush or flatten corrugation, but stop hammering when the sealing washer is held snugly with the nail head in a very slight dimpling of the corrugation crown.

FIG. 4. Nailing: Nails should be driven only through the crown of the corrugation as shown here.

Closure strips of rubber or asphaltsaturated felt are recommended for obtaining a more weathertight job. These. may be used for closing eaves, plain ridge aprons, plain end wall flashings, and similar locations. Nails for applying roof sheeting may be uSed for holding the. closure strips in place.

Application on Metal Structures

Corrugated roofing and siding may also be applied over metal structures. In such cases, the roof sheet or siding load requirements should be determined, and the purlin spacing then established in accordance with the limits set forth in the following table:

Load Carrying Requirements Corrugation Purlin Spacing

Gauge. Size 18" 24" 30" 36" 42" Pounds Per Sq. Foot 24 21.12" 121 70 45 31 23 24 1121" 62 34 22 .. 26 21,1)" 99 55 35 25 26 114" 49 28

Generally, a 35 to 40 pound uniform design load per square foot for siding is satisfactory for roofing, and 20 pounds per square foot for siding. Where applicable, local building codes should be consulted to determine roofing and siding load requirements. Should greater purlin spacing be desired than listed in the above. table, it is recommended that

industrial type aluminum corrugation he used. Where steel purlins are used, the

aluminum corrugation should be insulated from the steel with strips of 30pound asphalt-saturated felt over the hurlins, or with a generous coating of


aluminum-pigmented asphalt paint or mastic.

Attachment may be made with aluminum or coated steel strap fasteners, purlin clips, or aluminum purlin wires. Attachment to the strap fasteners and purlin clips should be by means of aluminum machine screws or rivets not less than 3/16" in diameter. Cadmium or zinc-plated screws and nuts may be used as an alternate, but they usually require painting within a few years in order to prevent rusting and electrolytic action with the erosion of the plating. Attachment should be made at every third corrugation at end laps and intermediate purlins. Between the purlins, the side laps should be fastened with aluminum sheet metal screws, minimum size No. 7 X 5/16", through the overlapped edges on 8" to 10" centers. Neoprene sealing washers should be used under the heads of the machine screws, purlin wires, and sheet metal screws.

Siding Application

Because of its greater rigidity, the 2V2" type corrugation is popular for siding. However, where solid or near solid sheathing is used, either the 11/4" or the 2%" may be applied. When open type sheathing or nailing girts are used, the opening should not exceed 15/. For walls exposed to traffic, storage, etc., the first four feet from the sill line upward should be sheathed nearly solid. It is recommended that a minimum of 15-pound felt be used between the siding sheets and the supporting structure.

A baseboard should be installed at the bottom of the building, fence, or screen tower. Start the first sheet at the lower rear corner of the structure at the end opposite the direction of prevailing winds. Extend the bottom of the sheet one inch below the baseboard. Allow two corrugations for bending around a corner, with the bending direction being from the front of the struc ALUMINUM RIVEV



Pierre shoe! and insert puma wiru llom You side, one on each side of guilt" Twin Iowel and; Iageme: av bollom ol purlin.







FIG. 5. Attachment Methods for Metal Structures: Three treatments for corrugations showu in above.

ture toward the rear to obtain a neat appearance. Bend only where the corrugation shape has started to bend in the desired direction. Do not reverse the bend direction of the corrugation in bending the corner.

Apply the second sheet beside the first one, with a minimum of one corrugation side lap, or, for better protection against wind leakage, lap two

FIG. 6. Siding Application: Cross section view of recommended steps. Because of its greater rigidity. 21A" corrugation is the most popular ior such use. Start at the lower rear corner of the structure.


1952 Theatre Catalog, 10th Edition, Page 229