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Unread 06-09-2015, 09:16 PM   #22
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Join Date: Jan 2012
Posts: 81
If CBU is not normally used for this purpose, I'll stick to the plywood for the base. I don't want to sacrifice function/quality for cost. I will however sacrifice other things to save on cost.

Okay, that's confusing to a newbie if they call the D-D grade "plywood" when it isn't technically plywood. See, this is why I need help, lol. But the one you linked that is B-C grade, is that one still fine for me to buy and use?

And since I'm most probably going to do the standard pre slope / liner / final mud bed route, I believe the first step for me will be to cut my PVC pipe, use a coupler, use some Oatey Medium PVC cement and Purple Primer (mine is old, from a few years ago, not sure if that stuff expires though) and attach/solvent weld the old pipe to the new pipe so it extends above ground, then use loctite adhesive to glue the plywood to the concrete with a small hole cut in the plywood for the PVC pipe, then attach the tile-in drain, then install the tile-in drain (I was thinking of something inexpensive like this I just hope it's adjustable: ), then build the curb, then put down 6 mil poly sheeting on top of the plywood to prevent the future base layer of concrete from losing moisture to the plywood, then put down metal lathe so the future base layer of concrete has something to grab onto (I'll staple the lathe to the plywood and plastic sheeting), then do the pre slope concrete base layer, then the liner, then the deck mud, then tile. Does that sound right for the order?

The thing is I first watched some videos on how to do this before I really knew anything about making a shower pan. Now that I know a bit more due everyone's help, I should go and watch them again and they should make more sense now to me.

One thing I'm not too sure about is why I can't just attach some metal sheeting under the hole in the concrete with some adhesive, then pour down a small layer of concrete just to fill the hole instead of using plywood. I would let the concrete dry and then build the shower pan over that. I would think (newbie thoughts) that the concrete would be solid enough. But maybe because it wasn't part of the original pour of concrete, the filled hole may not be structurally sound just adhering to the old concrete. And then when you do your base layer of concrete for the shower pan, I thought that may take care of any structural issues with the old hole since it's all one big base layer. But I guess it just can't be done that way?
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