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Sheet metal screws through plywood

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JStructsteel

JStructsteel

Structural
Aug 22, 2002
1,357
Got some tiebacks for some precast accents that was supposed to be metal straps to the top track of a wall. Now they have 1/2" plywood on the top track, and the screws go through that.

my first thought is its got bending in the screw now, and pull out is different.

More I think about it, its seems as long as the screw is tight to the plywood and long enough to engage the full thread of the screw, then the bending and pullout will be the same, since the strap to plywood has no real eccentricity.

What do you guys think?
 
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Are the screws loaded in shear and tension? What size screws and how much load?
 
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They are shear only, the straps are perpendicular to the panels. Its relatively light loading, 250# max on a 1/4" scew
 
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250 lbs sounds like alot actually. The light gage steel institute may have a design guide for this. I would be more comfortable with about 2/3 of that load.
 
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Sorry, thats per connection. there are two screws per connection.
 
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