Curbless shower rough in
Iím at the point of under slab rough in and looking for some advice before we pour the house slab.
Iím wanting to construct a curbless shower stall (54Ēx36Ē) and wondering what my best approach would be. The finishing in the bathroom will be the acid etched concrete slab with a tiled shower area. Is it common and would it make sense to recess the concrete in the shower area by X inches to accommodate a shower floor system like Kerdi Pan etc.? If so, what should X be.
I can also see a time in the future where someone might want to convert this space to a bathtub/shower but jackhammering up the floor would be ill advised since it will have radiant heat pex embedded in it.
So the next question is where/how should locate the shower drain such that, at some time in the future one could easily utilize the existing drain for a tub. I guess Iím looking for a rough in procedure that would be suitable for both. A linear shower drain would also be nice but that might complicate things and itís probably outside of my snack bracket.:(
Thanks in advance.
This is a very detailed question with tons to answer.
I ask builders to side on a larger recess than needed. Preparing a negative form of about 3.5" will give you loads of options. smaller negative voids are possible but you need much more precise planning. At concrete placing time you do not want to be building a piano. A simple 2"x4" form will do the trick. We ask they extend out past the shower's wet zone.
Before doing any math or form placement you should understand the requirements for tiling over a radiant floor with heat. Get the entire assembly worked out.
Do not plan to heat the floor under the tub or in the new shower with the radiant pipe if possible. We have not done this and prefer using cable heat.
Originally Posted by johnfrwhipple
Thanks John, My slab is only 4" thick so I guess I could just forgo the concrete in the shower area and just leave exposed Insulation. What about drain rough in? Just box it in like a normal tub?
You want the recessed slab to be of comparable thickness, so it will take some rebar bending and a depression in the slab there to keep things monolithic. You do not want the new shower pan to be floating from the existing slab or bad things will happen. My unprofessional opinion...you're just asking for the tile to crack over the transition into the main slab.
Thanks Jim, Excellent point.
What is the elevation of your perimeter drainage? Many times it can be very close to the basement floor slab. Check this out.
Originally Posted by C Williams
Have you decided on which drain you want?
Have you decided on tile layout?
Have you decided on a waterproofing system? In a basement application I would be looking at Noble Deck (bonded to pre-slope) and a clamping drain style rough in. How large is the shower. Noble Deck is 40mil thick and comes in 6' wide rolls.
If your unsure center your shower drain in the shower. We find using a 5.25" wide clamping drain set 1/4" off of the framing allows us perfect tight wall placement when it comes to setting the ACO drains.
The perimeter drain is 20" below the slab height. Have I decide on the drain I want? Nope. Tile layout? Nope. Waterproofing system? Nope. Show size? 36"x 64"
Perhaps I need to know to much of the finished details to have a curbless shower.
Wilson I got a call from a builder way up in the Queen Charlottes last night and we had this exact conversation for 20 minutes. In a nut shell a "Trained Ape" can most likely build a regular shower with a curb. Remove the curb and now your entering "Piano Building" - much more planning, much more risk, much greater investment and a much better or more useful shower space. I often need to scratch my head and figure out how to build a curbless shower.
The fact that your perimeter drain tile is so below the slab is a good thing for preparing your recess.
When building these showers I need heat. The home should be at lock up and the heat on. You need only at this point leave a recess or complete void where your planning the shower. Consider keeping the entire bathroom area a little lower - or pitching the entire room to one corner. Can you post a drawing of the room here? Who is placing the cement pour? I see so much cracking these days from these concrete crews.
Given me a call today and I'll give you some more information. (604) 506 -6792
Don't make any snap decisions on your remodel until you have invested the time into how to build it properly.
What kind of concrete finish are you using?
Have you looked up expansion joints?
What are you staining the concrete with? Any sealer? How thick will it be?