Metal Roof Span Tables

Flexrib siding through fastened roofing.

Metal roof span tables.

Table notes spans are based upon continuous support of compression flange over the full length of the joist. For two equal spans the listed span is the center to center distance from either end to the center support. All calculations for the properties of pbr roof panels are calculated in accordance with the 2012 edition of the north. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.

Calculated allowable properties are based upon aisi s100 07 north american specification for the design of cold formed steel structural members. Ksi reduced to 60 ksi in accordance with the 2012 edition of the north american specification for design of cold formed steel structural members a2 3 2. Flexbeam siding through fastened roofing. If the space between posts is greater than 8 feet then brace is needed to avoid buckling.

Fss 18 standing seam. For 2x6s purlins the posts are spaced in 6 feet distance. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. By the standard the most used placement of purlin span for metal roof is five foot intervals.

However it is important to note that expected load is a crucial factor while determining this. The metl span ls 36 insulated roof wall metal panel load span table is based on allowable stress design asd.