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Unread 01-06-2013, 01:24 PM   #1
jimmi328
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Treated or Non-treated lumber for a shower curb?

Hello All,

I was about to build a shower curb of treated 2 x 4’s and glue and screw the bottom piece to the concrete slab but decided to do a little more research; glad I did. Is it true that treated lumber will shrink as it dries and cause cracking of the tiles? Should I use basic lumber instead?

Thank you,
Jim
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Unread 01-06-2013, 01:28 PM   #2
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Yes, treated wood tends to twist and move around as it dries out. Use untreated 2x4's.
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Unread 01-06-2013, 04:31 PM   #3
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I thought the general consensus for a curb on concrete was bricks and mortar or curb blocks - and not any kind of lumber?
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Unread 01-06-2013, 04:53 PM   #4
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Nothing wrong with bricks and mortar, especially in a Kerdi shower. I prolly should have asked Jim if his is Kerdi. If there's a wall inline with the curb, sometimes a brick isn't wide enough and may need some mud to widen it out.

But, on a traditional pan liner shower curb, nothing is wrong with 2x4's.
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Unread 01-06-2013, 06:04 PM   #5
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I’ve heard and read briefly of Kerdi Shower’s but not at all privy of what they are about. I do know I want tile within the shower. Do Kerdi Shower’s allow for tile? My plan from the internet research I’ve done is to go the traditional method by building a concrete shower pan. First project of this type, hope I won’t regret this; don’t make enough money to pay a contractor. I just built the shower curb with non-treated 2x4’s. Hope thie pic uploads.

Great forum and great info; thank you.
Jim
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Unread 01-06-2013, 07:34 PM   #6
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It's hard to tell by your pic but you might want to add a stud to the left wall in line with the curb. That gives you something to nail to later on. Not sure about the right side.

Find the liberry above and you will find some Kerdi info in there. Also, John Bridge has a Kerdi book that you can download, it's in the TYW store.
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Unread 01-06-2013, 08:47 PM   #7
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As said above pt lumber is a bad idea. However, if you are using untreated lumber on a slab, you need to isolate it from the slab to prevent moisture migration. It's best done with tar paper or shingles under the curb, but a masonry curb would be best.
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Unread 01-06-2013, 09:00 PM   #8
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In most locations, it is a code violation to install untreated lumber in direct contact with concrete. I'm sure it is because of the reasons 'The Kid' gave.
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Unread 01-07-2013, 12:40 AM   #9
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Jim, tell us you put something under those 3 2x4's.

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Unread 01-07-2013, 05:36 AM   #10
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I didn’t think about a barrier beneath the 2x4’s, so it’s time to undo my first mistake. The hard part will be removing the construction adhesive.

Thanks again all.
Jim
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Unread 01-07-2013, 06:33 PM   #11
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would some red tuck tape (the kind used on plastic vapor barrier, etc) work as a barrier for a wood curb over concrete?
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Unread 01-07-2013, 10:04 PM   #12
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I dont know what red tuck tape is, but plastic, tar paper, foam insulation, roofing shingles. You get the idea. Then I would TAP COM the first 2x4 to the concrete. ( now you know why a lot of guys use bricks on a slab)

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Unread 01-08-2013, 12:15 AM   #13
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inspectors around here accept a 100% coat of construction adhesive as a moisture migration barrier. It's not ideal, but gets used a lot for plate pieces a foot or shorter that would split from nailing. So if you got full coverage under the curb you should be ok. If you just put a few blobs, then rip it out.

Also the liner will be about 3/16" thick where the corners get folded. It is best to notch out the bottom 10" of each stud about that amount so the bottom of the walls do not bulge out.

don't forget to pre-slope
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Unread 01-08-2013, 06:30 AM   #14
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Before I remove my mistake……

I thought about this last night and this AM saw the post from PetrH

In addition to the concrete screws I used to affix the bottom 2x4 (5 feet), I also coated the "entire" piece (bottom) with a construction adhesive. Would or could this adhesive function as a barrier between the wood and concrete?

I do have a permit in this city to do work on my own house but I don’t know what the code is.
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Unread 01-08-2013, 07:18 AM   #15
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Jim, one thing... don't make the same mistake I did. Make sure whatever you are covering the curb with has NO grout joints on top of the curb.
So... make sure your tile or whatever is large enough to accommodate two tiles on the outside of the curb , vertical with an allowance for the thickness of the tile and mortar behind them.
Otherwise, the curb is going to be large anyway with those studs, and you don't want water wicking through the grout joints.

Oh... also make sure you have a inward lean of your curb either by adjusting your setup or having additional mortar under your tile edges
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