Hi guys. Looking for info on hobless shower. Planning to screed myself.
How much drop from the screed in the bathroom to the shower is needed?
Welcome to the Bunnings Workshop community @Benniv. It's terrific that you've joined us, and many thanks for your question about bathroom screeding.
You'll find that the exterior edge of most hobless shower bases are flush with the surrounding floor level. A trim is added which prevents water from escaping. The shower screen is then installed. What is needed, though, is fall within the shower base towards the drain. 14mm of fall from the outside edge of the shower to the drain is adequate over a shower that measures 1200mm from corner to corner.
You should find these step-by-step guides useful:
Please let me know if you have any questions.
Thanks for the quick reply.
I was under the assumption you needed a form of lip step down around the shower. (Ie 10mm-20mm )
So to confirm if I had a 900x 900mm . Shower I could fall it 10/11mm .
Is that the most common practice?
You could create a lip step down or have a water stop trim angle that is proud of the tiles. I believe the relevant code you are looking for is as3740.
Enclosed Shower Area without Hobs or set-down
At the extremity of the shower area:
The L or T shaped aluminium trim is glued directly to the substrate, and waterproofing is bought up to it. Where it joins to the wall, it is also to be waterproofed. The tiles are then laid up to the vertical leg. This vertical leg must finish at a minimum of 5mm above the tile. Your shower screen can either be installed next to the trim or, if it has a rebate in the bottom channel, over it.
For shower floors without a vertical separation, the minimum fall is 1:80. That's from the edge of the shower to the drain. So, if the distance between your edge to drain were 80cm, you would have 1cm of fall. Yours will be around 45cm, so you'd have more like 0.6cm in fall. It never hurts to go a little steeper, as per my previous reply.
Please note: As per as3740, I've edited my previous comment for clarity to reflect the fact that a water stop trim must be installed in combination with the shower screen. A shower screen does not supersede this use of a verticle waterproofed trim.
Just one question since you're on a roll.
When screeding for bathroom floor, What allowance from the screed to finished floor in the bedroom (floor boards) do you allow for tile and adhesive.?
My colleague @MitchellMc is currently on a much-needed break and will be back on Friday. However, to answer your query if your tiles are 8mm thick, the thickness of the tile glue will be the same less 2mm for settling. I recommend getting one of your tiles and measure it against the slot of a QEP 8mm Square Notch Handyman Adhesive Trowel. If the tile does not fit the top of the slot, go for the next size up.
Using smaller trowels is not recommended as it will not provide enough glue for the tile to hold on to. It sounds like a fantastic project, any updates you can provide while renovating your shower would be much appreciated.
If you need further assistance, please let us know.