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Old 06-09-2010, 03:32 PM   #1
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Attaching bottom plate to concrete at edge near wall


Whats the best procedure for attaching a pressure treated 2x4 to the basement slab when its close to the wall? I have about 1" between it and the wall (with 3/4" XPS foam board behind it sealed up) then I am going to build a 2x4 wall infront of that to close that off with R-13 insulation and drywall... but the bottom plate im not sure what the best way to attach it is... I know screws, nails, and the explosion forced nails (forgot what its called) but I heard the forced nails could crack the slab that close to an edge not sure if that is true or not... but would Tapcon screws be just as good (i think they are known as blue screws sometimes?)

if using screws how do you do it? do you predrill the board and the concrete together then screw it in? would epoxy of any kind help here? or construction adheasive on the 2x4 on the floor to help hold it there? what are you opinnions on how to handle this? thanks!

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Old 06-09-2010, 04:24 PM   #2
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Attaching bottom plate to concrete at edge near wall


i shot the toe plate on 1 bsmt finishing project &, yrs later, used conc screws,,, like screws better drilled 2x4 in place w/wood bit so it marked the conc,,, then set that plate aside & finished w/conc screw bit(s) supplied in pkg,,, piece of cake

if const adhesive was being used back then, i didn't know it but i never made a living as a carpenter, either

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Old 06-09-2010, 07:15 PM   #3
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Attaching bottom plate to concrete at edge near wall


I just finished doing this in my basement and I used Tapcon screws. I have used different ways of doing this, over the years, and Tapcons are certainly the best.
As I was working by myself, I installed one screw at each end of the 2X4 to hold it in position then I drilled down through the 2X4 every 16" to score the concrete underneath. Once marked, I removed the 2X4 and drilled the concrete to the required depth.
If you have an assistant to hold the plate in position, perhaps it would not be necessary to use the end screws.

Last edited by Wildie; 06-09-2010 at 07:21 PM.
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Old 06-10-2010, 12:49 PM   #4
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Attaching bottom plate to concrete at edge near wall


what kind of spacing did you guys use for attaching the bottom plate with screws? on existing work in my basement it seems like every 2 or 3 ft they nailed it down
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Old 06-10-2010, 06:19 PM   #5
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Attaching bottom plate to concrete at edge near wall


Quote:
Originally Posted by BlueBSH View Post
what kind of spacing did you guys use for attaching the bottom plate with screws? on existing work in my basement it seems like every 2 or 3 ft they nailed it down
I put one between the studs. Studs are 16" O.C.
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Old 06-10-2010, 08:10 PM   #6
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Attaching bottom plate to concrete at edge near wall


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Originally Posted by BlueBSH View Post
what kind of spacing did you guys use for attaching the bottom plate with screws? on existing work in my basement it seems like every 2 or 3 ft they nailed it down
I think every 3ft. is PLENTY. Also, on another site it was recommended to use a trex type composite board under the PT 2x4 to prevent any water or moisture from wicking up. Seems like a good idea. I'm going to do it.
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Old 06-10-2010, 08:54 PM   #7
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Attaching bottom plate to concrete at edge near wall


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I think every 3ft. is PLENTY. Also, on another site it was recommended to use a trex type composite board under the PT 2x4 to prevent any water or moisture from wicking up. Seems like a good idea. I'm going to do it.
I like that idea! Wish I had thought of it when I did mine!
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Old 06-11-2010, 09:33 AM   #8
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Attaching bottom plate to concrete at edge near wall


I'm getting ready to install a 20' long wall (11' high) on my garage floor.
What size(length and thickness) Tapcon screws should one use?
What did you use to drill the holes for the screws?

Thanks,
Chris
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Old 06-11-2010, 03:00 PM   #9
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Attaching bottom plate to concrete at edge near wall


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Originally Posted by chrishallowell View Post
I'm getting ready to install a 20' long wall (11' high) on my garage floor.
What size(length and thickness) Tapcon screws should one use?
What did you use to drill the holes for the screws?

Thanks,
Chris
I used 1/4" on my last house. The tap con box calls for 1" min. embeddment. (ie: 1 1/2" PT board plus 1" into concrete = 2 1/2" tap cons.) I think they make 2 3/4". Def. use the hex head style NOT phillips head.
They are much easier to drive and won't strip out.
If you have access to a HILTI hammer drill use that they are the best.
My little 1/2" drive hammer drill couldn't cut it.
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Old 06-11-2010, 03:53 PM   #10
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Attaching bottom plate to concrete at edge near wall


Thanks seamus Mc.

I guess I'll be renting a tool to do the drilling. I'm guessing my drill driver isn't going to even scratch the cement.

What is this "trex type composite board" you talk about? Can I find it at a Lowes or The Home Depot?

Thanks again!
Chris
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Old 06-11-2010, 03:59 PM   #11
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Attaching bottom plate to concrete at edge near wall


First: Will this be a load bearing wall? IF SO: Check your local codes. NONE of these methods will pass, if inspected, in my area. A load bearing wall at/on the outer edge of a concrete slab can only be anchored with "J" bolts placed into wet concrete, or metal ties placed into wet concrete so as to tie the bottom plate down. As I stated: "IF inspected". David
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Old 06-11-2010, 05:48 PM   #12
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Attaching bottom plate to concrete at edge near wall


Quote:
Originally Posted by chrishallowell View Post
I'm getting ready to install a 20' long wall (11' high) on my garage floor.
What size(length and thickness) Tapcon screws should one use?
What did you use to drill the holes for the screws?

Thanks,
Chris
The proper sized drill bit came with the box of screws. However, instructions on the screw box will tell you the correct size also.
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Old 06-12-2010, 09:23 AM   #13
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Attaching bottom plate to concrete at edge near wall


Thanks everyone for their input.

This isn't a load bearing wall. The floor joists will be attached to this new wall, but that's it.
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Old 06-13-2010, 04:05 PM   #14
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Attaching bottom plate to concrete at edge near wall


Quote:
Originally Posted by chrishallowell View Post
Thanks seamus Mc.

I guess I'll be renting a tool to do the drilling. I'm guessing my drill driver isn't going to even scratch the cement.

What is this "trex type composite board" you talk about? Can I find it at a Lowes or The Home Depot?

Thanks again!
Chris
Trex is one of the brands of composite "non-wood" outdoor decking products. They both carry it.

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