#C1002 GRABBER SCREWS PROFESSIONAL#

I wonder how far a similarly sized standard wood screw would bend. I am not sure why drywall screws are not as malleable as nails it could be the cold heading process (suspected of causing internal ductile failures) but since the manufacturers design to the ASTM standard, you have to expect the screws to fail beyond an angle of 15 degrees. In practice I have found that they will go beyond 45 degrees but there is no way to predict at what angle they will lose their pull-out strength or fail. Building codes and industry standards require drywall screws to be able to be bent to an angle of 15 degrees without showing signs of fracture. Of course, the ductility of the screw is determined by the grade of steel used which is usually 1018. This toughens the surface of the screw but should not affect the ductility of the interior.

002 inch deep which is about 3% of the cross-sectional area of a typical #6 drywall screw. Loads must be accurately computed, then summed for the member, then enough fasteners of the correct size placed to provide a secure long term joint in the specified materials.Īfter you run through it a couple times you start to keep a 'cheat sheet' that summarizes things so you do not have to drag out all the standards over and over.ĭrywall screws are not actually heat treated which would affect the properties of an entire piece of metal they are case hardened, which only hardens the surface of the steel to a minimum of. 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.

#C1002 GRABBER SCREWS PROFESSIONAL#

Brickeye's statement is entirely correct but since he is a professional I'm sure he didn't mean to imply that drywall had 'absolutely' no structural application.ĭrywall screws are listed in IRC Table R602.3(1) 'FASTENER SCHEDULE FOR STRUCTURAL MEMBERS' for installation of exterior gypsum sheathing on wood or metal framing.

C1002 grabber screws