Generous margins are still required since a nail could be adjacent to the largest defect allowed in a grade of wood.ĭetermining nailing schedules for 'designed' connections takes a decent amount of time. The load bearing rating of nails depends on the species and grade of lumber they are driven into, as well as depth and nail size. If overloaded they will bend without breaking. If you go to higher grades of lumber the allowable loads increase since the material is more uniform. One of the things that keeps wooden buildings standing is the structural over design used since the material have rather large variation in strength. ![]() It does not imply the drywall and screws are structural elements.Įven shear panels of plywood cannot be attached with drywall screws. The "FASTENER SCHEDULE FOR STRUCTURAL MEMBERS" provides allowable fastener schedules based on what the drywall is being attached to (the "structural member"). It does not hold up anything but itself, and possibly insulation. Here is a link that might be useful: shear strength of drywall screws in drywall I'd say that was a structural application. I designed a multi-story elderly housing project laterally braced by interior drywall panels on metal studs which were designed by a structural engineer. Interior bracing walls are covered in section R702.ĭrywall screws may not be very effective or allowed for wood connections but they are by far the most effective fastener for transferring shear forces in gypsum wall panels as can be seen in GA 229 'SHEAR VALUES FOR SCREW APPLICATION OF GYPSUM BOARD ON WALLS' where they are said to be more effective than nails. Such wall systems meet the IRC lateral structural bracing requirements for exterior wall panels per section R602.10.3(5) with drywall screws from Table R602.3(1) at a maximum spacing of 7 inches on center.
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