Joint Spans For Metal Roofs

For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine.

Joint spans for metal roofs.

Common spans panels of corrugated metal roofing typically come in 6 foot lengths. Rafter spacing is based on the width of the metal roofing panels. For two equal spans the listed span is the center to center distance from either end to the center support with the joist continuous over the center support. For added strength and superior appearance the faces are textured with stucco embossing and are finished with baked.

Rafter and joist span faq the lengths and sizes of joists vary depending on the species and quality of the lumber used. A metal roof must also allow for some overlap on each side of the panels which will reduce the effective width of the panel. The k and kcs joists are used for shorter span conditions where lighter loads are required. Calculated allowable properties are based upon aisi s100 07 north american specification for the design of cold formed steel structural members.

You can order sheets cut to specific lengths ranging from 5 to 45 feet long although it is difficult to handle a panel longer than 16 feet. Wider panels allow for greater spacing between rafters. Spans are based upon continuous support of compression flange over the full length of the joist. Class 1 polyurethane foam is injected in line between two steel face sheets.