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Unread 01-06-2019, 02:48 PM   #91
Radas
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Originally Posted by ss3964spd View Post
IMO, since the assembly is now under tension I'd be inclined to leave the screws in place, so long as whatever metal they're made of will not corrode from the mortar/mud. I'd be concerned that at some point in time that it might pop loose from vibration, flexing, etc.
Good call Dan, maybe I will coat them in Sika construction adhesive a few days before packing mud in there to reduce any potential for corrosion even though they are already coated.

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Unread 01-06-2019, 02:59 PM   #92
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Couldn't tell what size head those screws have, but I bet coated deck screws would do the trick.
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Unread 01-06-2019, 03:05 PM   #93
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Couldn't tell what size head those screws have, but I bet coated deck screws would do the trick.
That's what I've got, 2.5" coated #8 deckmate screws

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Unread 01-06-2019, 03:24 PM   #94
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I'd leave 'em be then. If they can service that caustic preservative they use in PT lumber these days (ACQ?) a little fat mud isn't likely to hurt 'em.
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Unread 01-06-2019, 04:11 PM   #95
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Ali, packing thinset under the flange can be trying. I would pick up a small bag of brick morter and mix it up to where it won't "slump" as you pack it under the flange with a margin trowel. Gives good support and, when set, you can smear some loose thinset around the edges as you pack in the floor mud. Bonds just fine.
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Unread 01-06-2019, 04:19 PM   #96
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Laz,

I'll give that a go, then I won't have to worry about mixing a separate batch of wet mud as I make my mud pan. Thanks man, saved me more time to focus on the mud pan.

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Unread 01-06-2019, 05:44 PM   #97
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Unread 01-06-2019, 06:10 PM   #98
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I had the same problem with my Kerdi drain. Instead of bringing down one end I pushed up the other side and placed my mud under it. After it had cured, there was no way it would come down again.

I trust you haven't put too much tension on that pipe below. A little bit is ok but I wouldn't really force the pipe.

Unless your Kerdi shower is leaking, I doubt that those screws would ever corrode without the continued presence of moisture. I've gotten into the habit of using stainless steel screws in a lot of applications. A few more dollars but no worries about corrosion.
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Unread 01-06-2019, 07:56 PM   #99
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Glad I'm not the only one haha. Yeah I didn't flex the PVC too much as the assembly was level when I was holding the drain down for the glue to cure but the one side 'sprung up' a little. Real glad schluter put those holes on the outside of the drain flange.

I won't worry about the corrosion then since the area should never get wet again.

Out of curiosity, did you do a flood test Wolfgang? If so, what'd you use to block the kerdi drain? Bladder or expansion plug?

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Unread 01-07-2019, 07:16 AM   #100
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I'm using a Durock drain for mine, Ali, and had to buy a 2" rubber inflatable plug from Depot. For 22.00. For one use.

It's a little finicky getting it positioned correctly in the riser but below the joints, and then inflated. Mine has been installed since Sat morning. Wait on the inspector to arrive this morning.
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Unread 01-07-2019, 09:29 AM   #101
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A pack of party balloons are cheaper.......
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Unread 01-07-2019, 09:49 AM   #102
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I just used a regular 2 in plug, lubricated it with silicone grease, set it in place and pre-filled the depression around the drain with water. After a couple of hours I was certain it wasn't leaking. I then filled the entire pan.
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Unread 01-07-2019, 09:57 AM   #103
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Still a pretty inexpensive test for the long-term peace of mind, eh, Dan?

I bet your plumber would be happy to give you ten bucks for it if you really don't think you'll ever use it again.
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Unread 01-07-2019, 10:03 AM   #104
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Laz, I did consider a .07 cent alternative, in a nice purple shade, but those expand too much and I wanted to ensure I was testing the integrity of the O ring joint of the flange to the PVC coupling, and the coupling to riser joint.

That it is, cx, that it is.
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Unread 01-09-2019, 07:27 PM   #105
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Appreciate it Dan and Wolfgang, I will probably go the inflatable plug route.

Started Kerdi tonight, not as easy as schluter makes it look. Once I got over the learning curve, it went up pretty quick. I will do the curb, seams, and corners with kerdi band tomorrow night. I will also kerdi the niche tomorrow. I tried to use the mixer gasket but my drywall opening was not the right size - I'll use sikaflex instead.

Any tips on wrapping the niche?

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