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Tool Talk Discussion Forum

Concrete Screws

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Chuck in Kansas

08-02-2003 17:09:58




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I am trying to attached some wood strips to a cinder block wall on my well house. I have a hammer rill and some concrete screws. I have had no success in setting the screws. Do I have to drill a pilot hole first using a carbide concrete drill and am I just doing something wrong.
Thanks




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Mike D.

08-06-2003 20:30:53




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 Re: Concrete Screws in reply to Chuck in Kansas, 08-02-2003 17:09:58  
Believe it or not, you'll get better holding by using 4 penney cut nails and run a bead of liquid nails on the furring strip before nailing it up. Worked for me for many moons now. Just don't be in any hurry to tear it back off after that glue sets up!



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Mguy

08-04-2003 21:17:52




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 Re: Concrete Screws in reply to Chuck in Kansas, 08-02-2003 17:09:58  
Tapcons.



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Gary in IL

08-03-2003 11:24:09




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 Re: Concrete Screws in reply to Chuck in Kansas, 08-02-2003 17:09:58  
'Tap-Con' is the trade name of them around here

a box of them comes with a carbide bit to drill the proper pilot hole, the head is hex for a small socket



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DaveK(IN)

08-02-2003 20:25:55




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 Re: Concrete Screws in reply to Chuck in Kansas, 08-02-2003 17:09:58  
If you need 100% for sure attachment try toggle bolts w/ washers through the wood. Your hammer drill will easily make the hole in the web or you can do it with a hammer carefully.



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DRL

08-02-2003 19:46:26




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 Re: Concrete Screws in reply to Chuck in Kansas, 08-02-2003 17:09:58  
You can also get the screws that go directly into the concrete. Around here, they have a blue coating on them. They have a small six point head with a slot in it so you can use a socket or a screwdriver. If you purchase a full box of them, they come with a drill bit to drill the pilot holes. Sometimes cinder blocks can be tricky, and you will have to go with the anchor anyhow. Good luck



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TimV

08-02-2003 17:47:56




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 Re: Concrete Screws in reply to Chuck in Kansas, 08-02-2003 17:09:58  
Chuck: Yes you should drill a pilot hole. Wherever you got the concrete screws should be able to tell you the correct size.



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Jet9N

08-03-2003 07:53:44




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 Re: Re: Concrete Screws in reply to TimV, 08-02-2003 17:47:56  
I believe the 3/16 screws require a 5/32 hole, the
1/4 screws require a 3/16 hole.

Jet



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TimV

08-03-2003 08:52:58




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 Re: Re: Re: Concrete Screws in reply to Jet9N, 08-03-2003 07:53:44  
Jet9N: I belive you're correct--however, I wasn't sure and didn't want to give out the wrong size myself....:-) Chuck: A few more notes: DO NOT install these screws with your hammer drill--it's a sure recipe for stripping them out. Concrete screws require a delicate touch, as concrete does hot have nearly the tensile strength of steel, or even wood for that matter. My favorite method is to install them with a 1/4" ratchet with the appropriate size of socket, though you can do it with a cordless drill and a socket adapter as well--use the torque limiter (assuming it has one) to just snug them, and finish tightening by hand. They need to be just snug--any tighter and they'll strip out. Also, resist the temptation to clean out your drilled holes--the concrete "fines" can actually help the screws to hold better. Finally, you can get plugs, toggles, or similar setups to assist in holding the screws in, however, make sure you pick the proper method. Some are meant to hold in solid concrete, and will not work in a block wall as their gripping surface will be trying to grip on the empty space in the middle of the block. Air is not noted for its holding power....

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Delbert

08-02-2003 17:59:50




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 Re: Re: Concrete Screws in reply to TimV, 08-02-2003 17:47:56  
Drill pilot hole big enough to put a plastic plug into should tell on box for screws what size of plug. Or ask where you got the screws. I have installed vinyl siding on cement blocks this way. I think this could be what your thinking of doing. We went direct on to the blocks without boards. Takes sometime but can be done. Or as Tim said just drill pilot hole mabe a size smaller than your screws.

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