How to do curbless roll-in shower - new construction?

lazy_gardensOctober 20, 2012

Tile guys:

We are planning a house with poured slab floors (either on AAC or ICF substrate) with embedded hydronic heating loops. Over this will be tile and/or hardwood suitable for use with the in-floor heat.

Bathrooms will have roll-in showers - no curb - because we are geezers and want to "age in place". Tile is undecided, all I can say is it will be slip-resistant and suitable for wet areas.

In terms of the tiling, waterproofing and construction, what is the best way to get the required slope for shower drainage? Which style drain would work best? Drain location? Shower is at the "far end" of the bathroom, vanity is outside the shower/toilet room.

NOTE: There will be ample room under both the floors for pipes and drains to the greywater tank in the basement. We have >9ft ceilings for other reasons).

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With a slab pour, the easiest thing is to have the trench drain be on the far side of the shower from the entry and then work the wet concrete to be your preslope. I'd want enough rebar and fiber reinforcement in that concrete to avoid any future cracking of the slab. Then just use a topically applied membrane like Redguard and tile over it.

Insulating UNDER and around the slab will be critical to the success of this with your home. A concrete slab has six sides, and all of them will lose heat to the surrounding ground or air if given the chance. Then you are paying to heat the outdoors, not your house, and it becomes a money suck to do that. Be SURE that your contractor actually understands that and plans the insulation accordingly.

    Bookmark   October 20, 2012 at 1:49PM
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When doing what GreenDesign recommends, I'll alter it a bit. When the slab is poured, I'll have them box out the area where the shower footprint is, say 3-4" deep, or as deep as needed.

Then when it's time to build the shower, I'll create the floor pitch by packing sloped mud into the boxed out area.

    Bookmark   October 20, 2012 at 7:22PM
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Thanks. That's probably a detail the tile and concrete guys would have to negotiate with the GC (which may be me) before the pouring starts.

Insulation is not going to be an issue. The ICFs create a concrete box of a house with no air gaps, covered with foam insulation ... ready to finish off with stucco or siding. Floors have foam underneath.

Both floor slab methods create a non-cracking slab with lots of remesh and rebar. ICFs floor forms interlock the slab rebar with the ICF wall rebar and fill the whole thing with concrete. It's like a WWI pillbox.

    Bookmark   October 23, 2012 at 10:33AM
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I've done a few ICFs in my day. Good choice. My kids always wanted to come with me to work with the "big lego blocks". lol

    Bookmark   October 23, 2012 at 7:10PM
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We've been watching the build here - it's what decided us on the ACF.

Although her use of child labor is excessive. That poor exploited child has been toting block, making J-bolts, cleaning up the site, trimming foam, and making PR videos.

    Bookmark   October 24, 2012 at 12:23PM
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