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| I'm using Tapcon to take up the bounce in my subfloor (over Delta-FL...see other post). The Delta-FL instructions call for 1/4" tapcon. If I do those, the heads are so big that I can't countersink it into the wood subfloor. I wonder if I'm not getting the whole cleaned out enough. Do you blow the hole out (not sure I could suck out thru the plywood and delta-fl)?
I tried 3/16" screw with smaller heads, but these break almost every hole as I'm just about at the end of tightening. Any hints?
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Follow-Up Postings:
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| Yes, you have to get the dust out any way you can. Might try blowing it out with a small straw, coffee stirrer or the "canned air" for computers. You could also use a countersink bit to make more room for the heads, but maybe you can get away without that. A large bit works, too - just drill it a little to the depth/width you need. |
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| After the dust is out, use a larger drill or hammerdrill to screw in the tapcons. |
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| OK...I'm making progress, but still pretty frustrated. I'll recap about my surfaces (from top to bottom). 3/4 OSB Delta FL Old linoleum tile (the brittle kind) Concrete I moved to a corded hammer drill (cheap-rented, it's not a rotary hammer drill). I have Bosch Blue Granite drill bits. This combination worked well, but I went thru bits very quickly (2-3 holes per bit). I was able to get 1/4 tapcons in the hole and countersunk into the OSB if I blow out the hole with my compressor. Any other thoughts? |
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| I wouldn't use the same bit for going through the OSB etc. as going into the concrete. It shouldn't be necessary to use a rotary hammer drill for tapcons. |
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- Posted by lazypup (lazypup@yahoo.com) on Wed, Jun 27, 07 at 22:40
| "I have Bosch Blue Granite drill bits." I think you will find that is the problem..If you will get the appropriate "Tapcon" drill bits you will most likely solve your problem. |
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| I went and rented a Hilti rotary hammer-drill with a carbide bit. Each hole (3+ inchesfor a 1/4" tapcon) was done in 10 seconds. Did about 50 holes, my subfloor is tight now. Best $46 I ever spent. The rental even included the bit. Thanks for everyone's input. |
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