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Unread 03-29-2013, 09:02 PM   #1
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New shower stall questions....thanks in advance

New to this great forum!

I have a few questions....I am sure to have more later.

The Hardi backer website instructions say to Install boards 1/4” above floor, tub or shower pan and caulk accordingly.

1. This is 1/4 inch above the hot mopped pan or the finished mortar bed?
2. What type of caulk and what is the purpose of it?
3. At what thickness of mortar will the mortar bed on the hot mopped pan crack? I think I am looking at about 1 3/4 inches thick.
4. We are using 6 inch tumbled travertine tiles on the walls, what size grout line will look best?
5. Once the tiles are on the walls should I seal before the grout so as not to stain the tile with the colored grout and then again after grouting? Or is staining not an issue?

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Unread 03-29-2013, 09:26 PM   #2
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Hi Stu, welcome.

1. I think it's talking about 1/4 inch above a bath tub, then caulking. When installing in a shower stall, hold the Backer board up off the pan liner about 1/2 inch and then when mudding floor, force mud under the board to help hold it secure at the bottom. Keep all you nails/screws up 3 inches above the curb height.

2. Silicone but see 1. sounds like you have a shower stall.

3. 1 1/4 is about right but you can make it a little thicker if you want.

4. I usually make the joints about 1/8 at the bottom edge of the tile. With the cushioned edge, the grout at the top will be 1/4, maybe more in places.

5. Depends on the grout color. A dark grout in a light stone will want to stain in places, especially in the divots and veins. It's a good idea to seal first, makes cleaning a little easier.

Check out the "shower construction info" thread in the liberry. Lots of good info in there.

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Unread 03-29-2013, 09:43 PM   #3
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Thank you Sir.
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