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blschmitz 11-28-2007 07:06 PM

Framing on concrete subfloor
I am going to be framing in a 4' tall wall (a half wall, with a bar on top), to extend out my kitchen into my living room a ways, and realized that I've never framed onto concrete subfloor before. I looked at some other walls and the framing is held down with huge nails into the concrete, but I don't know how to do this after the fact. Anyone know how to do this? Fasteners, adhesive, etc????

Thanks for the help,


Kingfisher 11-28-2007 07:15 PM

use Tapcon screws for any box store and make sure the bottom plate is pressure treated. Thats all you need to do

Chris Johnson 11-28-2007 07:17 PM

There are several anchors available to fasten items to a sub-floor, the easiest DIY product is Tapcon screws. I have a preference for Titan HD's a little more expensive but structurally stable (You really don't need them).

Make sure the bottom plate is either a pressure treated product or you use a sill seal (sill gasket) to keep the concrete and wood seperated.

End Grain 11-29-2007 12:24 AM

You say that the original studs were "nailed" into the concrete. Perhaps renting a Ramset powder actuated tool may allow you to do likewise. The nails are specially hardened and I'm guessing that the larger of the two loads would be required. The concrete floors here in AZ are super tough and require drilling. Just make absolutely sure that you're not dealing with a post tension slab before you take a PAT or hammer drill in hand.

scorrpio 11-29-2007 06:53 AM

My personal preference are Hilti anchors sold at Home Depot. You drill a hole with a msonry bit (be sure to keep a water bucket nearby and dip the bit into it often), vacuum up the dust, hammer the anchor into the hole. Then, as you tighten the nut over the lumber being fastened, it wedges the anchor in the hole. I tried Tapcon, but they would just crumble the concrete and did not hold at all. Maybe I was doing something wrong.

Oh, and if you lay a bead of concrete-wood rated construction adhesive, the attachment will be incredibly strong.

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