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Old 03-04-2008, 08:55 AM   #16
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Tapcon question


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Funny this thread should come up, I've been having some problems with tapcons, hopefully someone here has some clues.

I've been trying to secure some walls to the floor and a poured wall, but they keep twisting off, even when it doesn't seem like there's much pressure on it as I'm running it in. I've been using the bit that comes with the tapcon, I've been drilling it much deeper than the length of the screw, and am making sure the hole is absolutely clean before running it in. I've also tried with 3 different other brands of bit, including Bosch, all appropriately sized of course. No matter what I do, they sheer off -- running them in smooth and slow, etc. Any thoughts? I've gone through maybe a dozen of them, only getting a couple in solid.
When you screw the tapcons in, are you switching to a drill? ....or switching the hammer drill to the "drill" option?

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Old 03-04-2008, 09:23 AM   #17
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Tapcon question


hehe, of course (using non-hammer to run them in). I guess it had to be asked, though.

One other thing that may be noteworthy, is that I used 4000PSI concrete for both. Not that it's *that* much harder to work with, but I'm curious if tapcons have some sort of upper limitations in that area.
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Old 03-04-2008, 10:04 AM   #18
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Hmmm, if you over-turn the screw, it will just strip-out. So that can't be the issue.

Generally, if you are losing the head of the screw, it is 99.9% of the time, going to be the screw bottoming out (unable to go-in any further)....
...puzzling, as you say that is not the case...

Last edited by AtlanticWBConst.; 03-04-2008 at 10:07 AM.
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Old 03-04-2008, 10:31 AM   #19
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Tapcon question


Yeah, it twists off maybe 1" down from the top, in the middle of the shank. I've done about everything I can think of to ensure the hole is cleaned out, and more than deep enough. I've even tried overdrilling them by almost 1" (as opposed to my usual 1/4-1/2"). Any experience using them in 4000PSI concrete?

Thanks again for your help.
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Old 03-06-2008, 12:44 PM   #20
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Tapcon question


Quote:
Originally Posted by csharp View Post
Funny this thread should come up, I've been having some problems with tapcons, hopefully someone here has some clues.

I've been trying to secure some walls to the floor and a poured wall, but they keep twisting off, even when it doesn't seem like there's much pressure on it as I'm running it in. I've been using the bit that comes with the tapcon, I've been drilling it much deeper than the length of the screw, and am making sure the hole is absolutely clean before running it in. I've also tried with 3 different other brands of bit, including Bosch, all appropriately sized of course. No matter what I do, they sheer off -- running them in smooth and slow, etc. Any thoughts? I've gone through maybe a dozen of them, only getting a couple in solid.
A few things about tapcons

The tapcons you are using might be too long. tapcons are only designed to go about 1" into the concrete, any deeper and they bind and snap. as they cut they create dust, and simply don't have the proper fluting to get dust out of the hole deeper than 1". floors are almost always problematic, unless you live in Florida, because of the high amount of aggregate used

tapcons work best when they are installed in a single motion. meaning they will snap less often if you put them in with a drill/driver or impact instead of a ratchet or screwdriver

a 3/16" tapcon bit IS NOT THE SAME as a 3/16" concrete bit. A bit intended for concret screws is made to a tighter tolerance than an ANSI standard bit. Most tapcons fail during installation for this reason. It's confusing for sure, box says hole size is 3/16", you want to use your SDS Bulldog, so you go to your local hardware store and buy a 3/16 SDS bit and can't figure out why they are either snapping off or spinning in the hole. It's because the bit you bought is either larger or smaller than the bit in the box. you can buy tapcon specific SDS bits, but you have to know to look for them. Standard bits might work for you, but just remember that if you are trying to acheive maximum tension loads you will usually get MUCH less than what the MFG publishes if you use an ANSI bit

you might have better luck with a product like a zamac nail-in or split drive anchor

Last edited by terri_and_jj; 03-06-2008 at 12:46 PM.
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Old 03-06-2008, 12:50 PM   #21
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Tapcon question


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Originally Posted by csharp View Post
hehe, of course (using non-hammer to run them in). I guess it had to be asked, though.

One other thing that may be noteworthy, is that I used 4000PSI concrete for both. Not that it's *that* much harder to work with, but I'm curious if tapcons have some sort of upper limitations in that area.

4000 psi should be no problem

all tapcon manufacturers that i have ever seen publish loads for 4000 psi, this is 'the standard' compressive strength
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Old 03-06-2008, 12:52 PM   #22
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Originally Posted by AtlanticWBConst. View Post
Hmmm, if you over-turn the screw, it will just strip-out. So that can't be the issue.

Generally, if you are losing the head of the screw, it is 99.9% of the time, going to be the screw bottoming out (unable to go-in any further)....
...puzzling, as you say that is not the case...
when using the correct bit, they should break before they strip the hole, unless you are dealing with a soft base material, like red brick, block, mortar joints etc

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