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Unread 07-31-2021, 08:34 PM   #61
arnav
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The Mrs. likes 24" x 48" porcelain slabs from Roca. I will need to cut 24" diameter hole in two tiles for the window (see pics). I am going to do a few practice runs on a few tiles before before fully committing to these big tiles. Any special techniques or tools to make two half circle cuts or do you simply use the trusty old angle grinder?

If all else fails I guess I can take it to a CNC shop

Thx!
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Unread 07-31-2021, 11:58 PM   #62
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I'm slow, you'll have to explain what a CNC shop is. Do they use a water jet?
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Unread 08-01-2021, 12:26 AM   #63
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Yes, yes (or laser)...

Davy, re your post here (a page back): https://www.johnbridge.com/vbulletin...5&postcount=52

In that configuration (embedded curbless like shower with a liner), how do you deal with the 2" PVC pipe? The pre-slope is 1" at the drain and the slope itself is 1.5". The shower drain's PVC pipe is 2" and it is over a 1 x 1 for proper slope (which makes it almost 3" high). It would be good not to have to create 3" thick mud bed...

Do you claim some height back with ply layers?

Thanks for the help
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Unread 08-01-2021, 08:11 AM   #64
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Dan, I should have taken more pictures of that floor before I tiled it. The previous shower leaked from day one and rotted out the floor joists in that whole end of the bathroom, so they had to be replaced. The original joists were 2x6's and the carpenter replaced them with 2x12's so they could notch them for the curbless design. The plywood floor in the shower was at least 3 inches lower than the bath floor.
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Unread 08-01-2021, 11:40 AM   #65
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Thanks Davy. What I take away from your post is that I can raise the plywood floor in the shower to the height of the 3" PVC pipe through a combination of 2 x 4s, ply layers etc' so that the mud pre-slope is just about above it.

In the setup that I have, what do you think the architect has intended to be the actual subfloor and underlayment?:

Level 1
  1. A sub-floor from 3/4" ply and 3/4" underlayment.
  2. The sub-floor is supported by 2 x 4s which are nailed to the concrete wall perimeter (see pic #1).
  3. There is a 2x4 in the middle with another 2x4 laying on its broadside (see pic2). The broad side 2x4 stops by the drain and doesn't span the entire length.
  4. Below that is stucco (there is a porch below).
  5. The "crawl space" is 5.5" high (i.e. the height from stucco to sub-floor).

Level 2 - raised shower platform
  1. A raised platform from 2 x 6s to raise the shower platform over the tub and shower waste pipes (see pic 3).

So...
  1. The original shower floor was above the raised platform (level 2). Since it was over 2x6s it had adequate support.
  2. For the curbless construction, I will be building the shower floor above level 1 (pic #1) which is supported by 2 x4s around the perimeter and middle.

Is a single vertical 2 x 4 enough across 4' span (pic #1)? Should I rip the subfloor and underlayment and add two more?

many thx
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Unread 08-06-2021, 11:08 PM   #66
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Bump. What do you think? Good to build a shower floor on top of what I got there?

Thx for the help
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Unread 08-07-2021, 08:28 AM   #67
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You want the section under the glass to have slope towards the shower. Not just the tile but also the pan liner. Looks like you have the chicken wire under the CBU in that area, don't see how that's going to work.
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Unread 08-07-2021, 08:55 AM   #68
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Here's a quick sketch. I like to have the liner come up vertically where it meets the bath floor. The way your drawing shows, the water can hit the pan and seep back into the bath floor. The blue line is the liner.
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Unread 08-07-2021, 09:45 AM   #69
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Thank you for taking the time and drawing. I would have not gotten it without it (though probably still got something wrong).

So like this?
- With the lath tracing the liner, and no lath overlapping the ply?
- Combination of mud + stucco on the side?

It is understood that all surfaces / materials are pitched half a bubble to the drain.

Also, is a single vertical 2 x 4 enough across 4' span (see details and pics above)...
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Unread 08-07-2021, 01:11 PM   #70
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The last one I did, I notched the top layer of plywood about 1/4 inch deep and about 1 inch wide to give a space for the liner and lath to fold over without holding up the CBU. Actually, I used Ditra on the bath floor. Just remember to keep your nails in that notched space. Pre bend the lath to fit without any nails in the lower area.

I'm not following you on your vertical 2x4 question.

On the liner pitch, you want a minimum of 1/4 inch per ft.
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Unread 08-07-2021, 02:33 PM   #71
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Got it!

Quote:
Originally Posted by Davy
I'm not following you on your vertical 2x4 question.
A single vertical 2 x 4 supports the floor across 4' span. Gory details:

Level 1
- A sub-floor from 3/4" ply and 3/4" underlayment.
- The sub-floor is supported by 2 x 4s which are nailed to the concrete wall perimeter (see pic #1).
- There is a 2x4 in the middle with another 2x4 laying on its broadside (see pic2). The broad side 2x4 stops by the drain and doesn't span the entire length.
- Below that is stucco (there is a porch below).
- The "crawl space" is 5.5" high (i.e. the height from stucco to sub-floor).
- I am looking to build the shower floor directly on this level


Level 2 - raised shower platform
- A raised platform from 2 x 6s to raise the shower platform over the tub and shower waste pipes (see pic 3).

So...

- The original shower floor was above the raised platform (level 2). Since it was over 2x6s it had adequate support.
- For the curbless construction, I will be building the shower floor above level 1 (pic #1) which is supported by 2 x4s around the perimeter and middle.


Is a single vertical 2 x 4 enough across 4' span (pic #1)? Should I rip the subfloor and underlayment and add two more?


Does that make sense? Thxs for bearing with me...
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Unread 08-09-2021, 01:55 PM   #72
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So did that make sense? A single vertical 2 x 4 across 4' span of two 3/4" ply sheets?

Thx for the help
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Unread 08-09-2021, 02:16 PM   #73
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Try as I might, I cannot see where you plan to put this 4' 2x4 and for what purpose, Dan.

And for purposes of clarity, where you have two layers of 3/4" plywood, the top layer is a second layer of subflooring. The CBU in your drawings is your underlayment.
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Unread 08-09-2021, 02:20 PM   #74
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Hi CX!

I am describing how the current floor is supported.
The 2 x 4 I am referring to is the one by the pvc pipe (underneath the floor) in pic #1 above (or in the attached PDF if you want to zoom in).
The 2 x 4 supports the 4' span of the two ply sheets.

Thx for the help
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Unread 08-09-2021, 03:09 PM   #75
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The one that says "2x4 flat?"

Do I understand that everything in photo #3 no longer exists?
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