![]() Fasteners shall have rust-inhibitive coating suitable for the installation in which they are being used, or be manufactured from material not susceptible to corrosion. Table 10.1 has span length multipliers for ‘Low and Medium’ and ‘High and Very High’ wind zones. For all connections, screws shall extend through the steel not fewer than three exposed threads. 6 screws conforming to ASTM C954 or ASTM C1513 with a bugle-head style and shall be installed in accordance with Section R805. Gypsum board ceilings shall be attached to cold-formed steel joists with minimum No. They are stronger than solid timber rafters, therefore can span further and require less internal support. Posi-Rafters are suitable for both pitched roofs and flat roofs. ![]() Screws for attaching structural sheathing to cold-formed steel roof framing shall have a minimum head diameter of 0.292 inch (7.4 mm) with countersunk heads and shall be installed with a minimum edge distance of 3/ 8 inch (9.5 mm). Wood roof rafters are sized based on one of eight tables found in the code. As with Posi-Joist floor joists they are designed and manufactured offsite and tailored to the requirements of each individual project. 8 self-drilling tapping screws that conform to ASTM C1513. The loads are based on adjusted roof snow loads from the governing building code. A span options calculator allows selection of multiple species and grades for comparison purposes. Rafter spans are tabulated for the most common roof loads. Joists and rafter spans for common loading conditions can be determined. ![]() Structural sheathing shall be attached to cold-formed steel roof rafters with minimum No. Performs calculations for ALL species and grades of commercially available softwood and hardwood lumber as found in the NDS 2018 Supplement. Screws for steel-to-steel connections shall be installed with a minimum edge distance and center-to-center spacing of 1/ 2 inch (12.7 mm), shall be self-drilling tapping and shall conform to ASTM C1513. ![]()
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