Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Closed Thread
 
Thread Tools Search this Thread Display Modes
Old 05-20-2007, 10:28 PM   #1
Newbie
 
Join Date: May 2007
Posts: 10
Rewards Points: 0
Share |
Default

I can't get tapcon screws to tap into the concrete slab!?


I can't get tapcon screws to tap into the concrete slab!?

My husband and I are installing a 5/8" plywood subfloor plus 1" foam over our concrete slab. We are using 3/16 tapcon screws that are 2 3/4" long. We have rented a hammer drill, and are using a 5/32 bit to drill into the concrete. We are drilling down 1/4" longer than the screw, but the screws don't seem to be tapping into the concrete. Our screws will go in so far, but then the head of the screw gets stripped, despite brand new bits. Maybe our regular drill does not have enough power to get the screws to go down?? Do we need a drill with more torque to get the screws to go in?? Does anyone know why we might be having trouble? What can I do to fix this? It states on the tapcon box that for a 3/16 screw to use a 5/32 drill bit, which is what came with the box...and is what we have tried and is not working. We have tried using a 3/16 hammer drill bit as well, but this proved too big.

Monty is offline  
Old 05-20-2007, 10:59 PM   #2
zel
Member
 
Join Date: Mar 2007
Location: SE PA
Posts: 229
Rewards Points: 0
Send a message via AIM to zel
Default

I can't get tapcon screws to tap into the concrete slab!?


Maybe try the lowest speed setting on the drill? I know sometimes the higher speeds tend to strip the heads. Also, maybe try a square drive, or even a hex head?

zel is offline  
Old 05-21-2007, 05:44 AM   #3
Member
 
RippySkippy's Avatar
 
Join Date: Feb 2007
Location: Ames, Iowa
Posts: 1,233
Rewards Points: 0
Default

I can't get tapcon screws to tap into the concrete slab!?


Are you using the hammer drill to drive the screws? If not...I would HIGHLY recommend it or an impact driver. When I drove a couple hundred screws for a project last summer with a standard 18V cordless...those babies would just torque and snap in a heart beat...with the hammer drill...piece of cake. You might try the tapcon driver, it's ok...I have it. If you use the same hammer drill for drilling and driving...it'll be quicker than chucking and re-chucking all the time.

You might want to check out the split anchors for this application, WAY faster to install...and I've had excellent results from them in a "no load" application. (look around on this site, there's a ton of information on different connectors and applications, no affiliation)

Another option are the GRK concrete screws...but you'll find them similar to the tapcons.

Good luck.

Last edited by RippySkippy; 05-21-2007 at 05:46 AM. Reason: added URL
RippySkippy is offline  
Old 05-21-2007, 02:36 PM   #4
Member
 
Join Date: Apr 2007
Location: Downeast Maine
Posts: 999
Rewards Points: 0
Default

I can't get tapcon screws to tap into the concrete slab!?


Are you using the right size philips bit? You might need a #3 for that screw.
NateHanson is offline  
Old 05-21-2007, 02:40 PM   #5
I have gas!
 
Clutchcargo's Avatar
 
Join Date: Mar 2007
Location: Massachusetts
Posts: 1,774
Rewards Points: 14
Default

I can't get tapcon screws to tap into the concrete slab!?


You need the socket bit to drive those in. The screwbits just strip the screwhead out..
__________________
I tear things down and build them up.
Clutchcargo is offline  
Old 05-21-2007, 03:36 PM   #6
Member
 
Join Date: Jan 2007
Posts: 1,787
Rewards Points: 0
Default

I can't get tapcon screws to tap into the concrete slab!?


Make sure you use a shop vac and remove all the dust in the hole. Try predrilling even deeper. Also, if they were using the wrong size screw bit, the screw would strip before the head breaks off.
handy man88 is offline  
Old 05-21-2007, 06:52 PM   #7
Newbie
 
Join Date: May 2007
Posts: 10
Rewards Points: 0
Default

I can't get tapcon screws to tap into the concrete slab!?


we've ended up going with redheads and simply predrilling, then hammering those into the concrete slab. thanks for your advice!
Monty is offline  
Old 05-21-2007, 09:21 PM   #8
Member
 
Join Date: Apr 2007
Location: Downeast Maine
Posts: 999
Rewards Points: 0
Default

I can't get tapcon screws to tap into the concrete slab!?


Quote:
Originally Posted by handy man88 View Post
Also, if they were using the wrong size screw bit, the screw would strip before the head breaks off.
Quote:
Originally Posted by Monty View Post
Our screws will go in so far, but then the head of the screw gets stripped, despite brand new bits.
I think they're saying that the screw heads are getting stripped, not breaking off.

Sounds like they need a hex-socket drive.

(If you have a hex-to-square 1/4" adapter, you can use a regular socket in your hammer drill.)
NateHanson is offline  
Old 06-15-2009, 06:56 AM   #9
Newbie
 
Join Date: Jun 2009
Posts: 3
Rewards Points: 0
Default

I can't get tapcon screws to tap into the concrete slab!?


Monty I am having the same problem installing floor can you give more detail on how you did it using redheads (what is a redhead)

Thanks
wingman77 is offline  
Old 06-15-2009, 07:19 AM   #10
Newbie
 
Join Date: Jun 2009
Posts: 3
Rewards Points: 0
Default

I can't get tapcon screws to tap into the concrete slab!?


Having the same problem as Monty I am using 1/4 tapcon x 2 3/4 as well as 1/4 x 3 1/4. Material thickness is 5/8 plywood and 1 inch foam board. I drill the correct hole depth but tapcon does not go all the way down it stops about 3/8 from the plywood .I have tried driving with the hammer drill either breaks the screw or strips the head torque gun just stops driving it is only a 12 volt .I clean the hole properly so I know that is not the problem. Using countersunk hexhead tapcons because must be flush with plywood.
wingman77 is offline  
Old 06-15-2009, 08:28 AM   #11
DIY til I die!
 
Join Date: Aug 2008
Location: Bensalem PA
Posts: 44
Rewards Points: 0
Default

I can't get tapcon screws to tap into the concrete slab!?


I recently used some 1/4" tapcons and had some minor issues. My advice would be to drill the hole slightly deeper, maybe a 1/4" and use compressed air to clean out the holes. If the drill dust has nowhere to go when the screws get there, its like not having the hole predrilled. Just my .02
Zel1 is offline  
Old 06-15-2009, 08:29 AM   #12
Member
 
RippySkippy's Avatar
 
Join Date: Feb 2007
Location: Ames, Iowa
Posts: 1,233
Rewards Points: 0
Default

I can't get tapcon screws to tap into the concrete slab!?


Have you thought about using the split drive anchor?
__________________
when it comes to breakfast, the chicken is dedicated, the pig is committed.
LMASD
RippySkippy is offline  
Old 06-15-2009, 08:52 AM   #13
Member
 
Join Date: Apr 2008
Posts: 47
Rewards Points: 0
Default

I can't get tapcon screws to tap into the concrete slab!?


There are many reasons that tapcons fail. You have 1 5/8 of material being fastened to the concrete and the mininum embedment of a 1/4 tapcon is 1" into the concrete. A 1/4 x 2 3/4 tapcon is the correct size.
The hole to be drilled is 3/16. The hole must be cleaned out with a shop vac and driven with a #3 phillip tip driver. When driving the screw use a corded drill that is not a hammer drill.
Bronx is offline  
Old 06-15-2009, 09:25 AM   #14
Old School
 
Willie T's Avatar
 
Join Date: Jan 2009
Location: St. Petersburg, FL Minds of moderate caliber ordinarily condemn everything which is beyond them.
Posts: 3,634
Rewards Points: 0
Default

I can't get tapcon screws to tap into the concrete slab!?


Zel1 hit on a very important point..... compressed air. Very often a shop vac will not get all the dust out. And as you are drilling, it pays to pull the bit upward, yanking out as much of that dust as you can about every three or four seconds.

Don't forget your eye protection when blowing out the holes... that crap will come straight back toward your eyes.
__________________
"True eloquence consists in saying all that is necessary, and only that which is."
François Duc de La Rochefoucauld
Willie T
Willie T is offline  
Old 06-15-2009, 10:08 AM   #15
Member
 
HABSFAN2006's Avatar
 
Join Date: Feb 2009
Location: Ottawa, Canada
Posts: 158
Rewards Points: 0
Default

I can't get tapcon screws to tap into the concrete slab!?


Quote:
Originally Posted by Bronx View Post
There are many reasons that tapcons fail. You have 1 5/8 of material being fastened to the concrete and the mininum embedment of a 1/4 tapcon is 1" into the concrete. A 1/4 x 2 3/4 tapcon is the correct size.
The hole to be drilled is 3/16. The hole must be cleaned out with a shop vac and driven with a #3 phillip tip driver. When driving the screw use a corded drill that is not a hammer drill.
Above is the proper procedure that has worked for me everytime.
Ensure the hole is deep enough...Another secret, is to ensure you are perfectly straight, with some downforce on the drill. Also, do not stop for any reason mid way.
Once you get the hang of it, none of them will strip.

__________________
Life is an experience... Learn from it!
HABSFAN2006 is offline  
Closed Thread


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Extending Concrete Patio Slab bobo Building & Construction 6 04-17-2008 12:17 PM
Filling hole in carport (concrete slab) chaddihimself Building & Construction 2 08-10-2007 12:50 PM
Remodel over sloped concrete slab PSL_Hokie Building & Construction 11 07-11-2007 05:14 PM
cracks in concrete slab causing home sale to fall though! help! bp13 Building & Construction 14 07-04-2007 12:32 AM
Concrete slab weeps moisture dale h Flooring 2 04-30-2005 10:29 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.