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Unread 02-14-2020, 01:45 PM   #16
Ahmad
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Yes, I think it's pretty much the same as Quikerete, as both has 5000 PSI for after 28 days and 2000 PSI for 7 days. & yeah we do have bilingual labels here.

I went with your advice and bought a bag of sand with it, to increase the ratio to 5:1. I'm planning on doing the pre-slope tomorrow, so will update next week, specially if there was anything different with this brand of sand mix.

I have tried to find on TTMAC if there is any different mix ratio, but was unable, I guess we the "frozen north" doesn't get any special ratio

Thanks, again!
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Unread 02-15-2020, 07:43 PM   #17
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So the pre-lope is done.... Waiting for tomorrow to see if it would be as expected.

I want to revisit the waterproofing of the cement board that I asked earlier. I had decided to apply a liquid water proofing on the front of cement boards, but I read that installing tar paper behind the CB would also do the same job. Given that I have a full roll of tar paper, I would prefer to do this, than doing liquid water proofing, if this is not going to compromise anything? So it would be the studs, tar paper and then CB.
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Unread 02-15-2020, 08:26 PM   #18
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So long as the roofing felt, minimum #15 (formerly 15#), is properly installed with adequate overlaps and in shingle fashion and laps several inches over the shower pan liner, it's a perfectly acceptable water containment method.

My opinion; worth price charged.
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Unread 02-15-2020, 08:26 PM   #19
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Will it work? Yes, if everything is overlapped and installed properly. But keep in mind it is the bare minimum.
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Unread 02-15-2020, 09:17 PM   #20
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@DX what do you mean by "over the shower pan liner"? I know that it should overlap the liner, but I thought the tar paper goes first and then line on top of it, correct? Or should the liner go first and the tar paper on top?
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Unread 02-15-2020, 10:07 PM   #21
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The tar paper on the walls is to overlap the liner so that any water that hits the tar paper flows into the liner. Like roof shingles.
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Unread 02-16-2020, 08:59 AM   #22
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Thanks that makes sense now. I will put the tar paper on over the liner.

One more revisit, the position of CB above the liner, as advised here that my CB should go into the top layer of the mud, and that is fine, while other places, like Bob from star tile says that it shouldnot come in contact with the mud bed, and should be installed after the final layer of the mud is installed and should have a slight gap as well. My question is, what is the disadvantages of installing it above the mud layer?
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Unread 02-16-2020, 09:48 AM   #23
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The disadvantage is there is nothing to old the bottom of the cement board tight to the studs since you cannot nail or screw it to the studs that low.

Install the CB panels so they end 1/4" or so above the liner, then install the top mud layer. The top mud layer then holds the bottom of the CB panels tight against the studs.
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Unread 02-16-2020, 11:36 AM   #24
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Bury the CBU into the mud bed only if it's a true Cement board. I think Cx touched on this in post 13. Hardie board is a fiber board and not a cement board. Denshield is another one that can't be buried in the mud. Wonder board, Durock, etc. can be buried.

I'd avoid Starr tile videos.
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