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Old 12-16-2015, 10:46 PM   #1
PKC
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Using Cement Board for Shower Base


Traditionally one put dry mix underneath the vinyl lining to form a slope towards the drain as the base layer when constructing the shower base.
Anyone tried using cement board to do the same? The cement board can be cut into 4 triangular shaped sheets. These will be laid side by side over thin set (for better adherence) to the desired slope coveing the full surface of the shower floor.
Advantages for this alternate approach are: a) less dry mix to handle, b) easier to achieve a smooth surface for laying the vinyl, c) thin set adheres much better to the subfloor than dry mix, rendering the wire mesh optional.
Yes, the downside might be spending a few more dollars on cement board and thin set. But faster for sure.
I didn't go into the Kerdi system because of the cost involved.
Your opinion appreciated.
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Old 12-17-2015, 07:25 AM   #2
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You are thinking of this wrong----it has been tried and proven to be a failure.

You need to preslope the floor before a liner is installed--this will add drainage to the liner so the deck mud will dry out between showers--

this will leave you with an uneven surface---no way to simply thinset a sheet of Durrock to that-----the liner is loose on top of the preslope---it needs a layer of deck mud on top to pin it down---How to build a shower - Building a shower pan with pre-sloped mortar bed, liner and curb.
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Old 12-17-2015, 09:48 AM   #3
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Using Cement Board for Shower Base


Thanks Mike for your comment.
You are right. My intention is to put a layer of deck mud (as you called it) on top of the liner as one normally do and then the tiles.
It is what's below the liner that I am suggesting the alternative. And yes, the cement board will be slopped towards the drain so the water caught over the liner will drain away into the under-drain.
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