Treated Or Untreaded 2x4 At Bottom Of Interior Walls - And How To Fasten? - Building & Construction - DIY Chatroom Home Improvement Forum


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Old 02-17-2009, 05:48 AM   #1
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Treated or untreaded 2x4 at bottom of interior walls - and how to fasten?


  1. I know that an exterior wall bottom sill against a concrete slab is to be treated lumber - but how about interior walls, treated or untreated?
  2. What is the proper way to fasten interior wall sills to a concrete floor?
  3. I am replacing a sliding patio door with a window - so I will be installing a new bottom sill and framing for the window opening. How to fasten this sill?
thx!
Vince

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Old 02-17-2009, 06:54 AM   #2
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Treated or untreaded 2x4 at bottom of interior walls - and how to fasten?


Any non treated wood must not directly contact cement.

Pressure treated can be placed on concrete but not in dirt. Pros will use a power nail gun to shot steel nails into the slab. You can use a hammer drill and Tapcon fasteners. For the door sill I would use lead anchors with 1/4-20 bolts countersunk and plugged. Be sure to make a sill pan and flashing for this. And apply a double bead of silicone under the threshold.

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Old 02-17-2009, 07:45 AM   #3
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Treated or untreaded 2x4 at bottom of interior walls - and how to fasten?


I would use a flat head contersunk sleeve anchor for the door and a tapcon concrete screw for fastening to the concrete floor. Be sure to use the correct size tapcon. If it is too long the screw will bind up in the hole and mabey shear the head of the screw off. If the tapcon is too short you may not reach the mininum enbedment and not get the proper holding values for your application. The ideal embedment is between 1" and 1 3/4 " into the concrete. Take a look at www.concretescrews.com if you need installation instructions.
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Old 02-17-2009, 11:28 AM   #4
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Treated or untreaded 2x4 at bottom of interior walls - and how to fasten?


Quote:
Originally Posted by Bob Mariani View Post
Any non treated wood must not directly contact cement.

Pressure treated can be placed on concrete but not in dirt. Pros will use a power nail gun to shot steel nails into the slab. You can use a hammer drill and Tapcon fasteners. For the door sill I would use lead anchors with 1/4-20 bolts countersunk and plugged. Be sure to make a sill pan and flashing for this. And apply a double bead of silicone under the threshold.
I did not know of such a thing (sill pan) - via your comment and a Google, now I know.

Thanks!
Vince
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Old 02-17-2009, 11:53 AM   #5
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Treated or untreaded 2x4 at bottom of interior walls - and how to fasten?


Quote:
Originally Posted by vsheetz View Post
I did not know of such a thing (sill pan) - via your comment and a Google, now I know.

Thanks!
Vince
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