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Discussion Starter #5
No flange on that tub?
If you zoom in you can see it. IIRC, Im supposed to bring backerboard within 1/16" from the top of the flange. Then silicone the gap. Then tile to within 1/16 of the flange, then silicone that gap again.

Sound right? Ive never installed an alcove tub before. She was a beast. 315lb cast iron.
 

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I would fill the hole flush with thin set mortar. Before it dries overlay mesh tape so it embeds a little. When dry, mesh tape the joints and lightly cover them and the hole with thin set. If you want the space, tape a piece of cardboard on the tub and do the aforementioned. Then dig out the cardboard and caulk.
 
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retired framer
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I was in a house one time while 3 plumbers were fighting one of those in the house. And then they had a great discussion in Punjab. They stuck some flat stock around the back with silicone and left that to dry before putting it in. Not sure what they installed for flat stock but it was like a flange 2 or 3 inches wide.
 

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Neal is likely thinking about the flat flange that most tubs have that gets nailed to the studs to ke everything in place. As to your hole, just put some thinset in it and forget it. The tile will easily span that.
 

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retired framer
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Neal is likely thinking about the flat flange that most tubs have that gets nailed to the studs to ke everything in place. As to your hole, just put some thinset in it and forget it. The tile will easily span that.
No, I am thinking of what they did to a cast iron tub. It was a drop in tub going in an alcove.
 

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Remove the sheetrock, and use only concrete backer with a waterproof coating. I would install the backer all the way to the floor. There is nothing wrong with that. I like doing that especially on the wall that is behind the tub to keep air from coming in.
 

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If you zoom in you can see it. IIRC, Im supposed to bring backerboard within 1/16" from the top of the flange. Then silicone the gap. Then tile to within 1/16 of the flange, then silicone that gap again.

Sound right? Ive never installed an alcove tub before. She was a beast. 315lb cast iron.
Sounds right. Depending on the size of the tile that should work nice. You don't really need silicone behind, just thinset or whatever. A 1/16" gap between the tub and tile is mighty ambitious, might be better off trying for 3/32 to 1/8".
 

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Discussion Starter #12
HandyAndyInNC; said:
Remove the sheetrock, and use only concrete backer with a waterproof coating. I would install the backer all the way to the floor. There is nothing wrong with that. I like doing that especially on the wall that is behind the tub to keep air from coming in.

It’s not sheetrock. It’s denshield. A waterproof backerboard. An alternative to cement board.

I did apply redgard to the seams and then to the whole board. Not required. But I went with the overkill method. The redgard doesn’t really take well to the denshield because it is waterproof.
 
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