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URL:  http://boards.fool.com/those-simple-screws-look-incredibly-not-strong-to-30426596.aspx

Subject:  Re: more carpentry advice :-) Date:  12/11/2012  6:05 PM
Author:  foo1bar Number:  123334 of 131290

Those simple screws look incredibly not-strong to me.

Plastic anchors in the correct sized hole do pretty well at not being pulled out. They aren't something I'd use overhead for anything more than a construction paper kids project. But for what you're doing, I think they'll be more than sufficient.

Tapcons are probably as good or better than the other thing you had - the screw threads bite into the concrete, so for them to be pulled out, either the thread fails, or the concrete does. I have used tapcons for a small project (mounting safety sensor for garage door) and the only issue I had was drilling the holes (I think I hit a rock or something that didn't drill easily, but moving half-inch to the side gave me no problem - and now that I have a rotary hammer drill, I don't think I'd have a problem at all.)

Looking at the tension force on tapcons - it'd take a lot to pull them out of a cement wall:
http://www.concretescrews.com/technical-info/tapcon-concrete...


My best thought to attach the vertical "bulkheads" to the strips is something like this: http://www.carinya.com.au/plugins/carinya/images/angle_brack.....