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Thread: Bathroom Drainage
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4th March 2008, 07:14 AM #1
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Bathroom Drainage
I am about to lay some cement sheeting over a timber floor, i got advice on the correct sheeting to use, but have to idea how to create a drainage slope to the outlet in the floor.
If i was rendering a floor, no problem, but laying sheeting directly to the floor, how do i create one? Any ideas out there?
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4th March 2008, 08:51 AM #2
the ac sheet is only to isolate your tiles from the timber floor below ,if you want a fall to the waste you will have to screed a bed over the ac sheet
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5th March 2008, 12:57 PM #3
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I have exactly the same issue ahead of me ozpom. Several people have told me not to worry too much about a slope to a drain. I'm going to make sure my floor is level and just put the drain in the middle. If there's a flood it'll drain out. Small amounts of water sitting around for short periods of time aren't too much of drama. Of course I might be talking complete rubbish...hopefully someone here will confirm this (or otherwise) as a viable option.
Alternatively, someone gave me the great idea (although I'm not going to do it) of slightly sloping the whole floor using spacers under the villaboard and have a drain along one wall.
I'm not keen on the hassle of laying a scree (which I expect I would probably bugger-up).
cheers, Brett
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7th March 2008, 01:44 PM #4
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Would have to agree with you Bretts, would only mess up any screeding, probably end up sloping away if anything!
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10th March 2008, 05:59 PM #5
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10th March 2008, 06:08 PM #6Several people have told me not to worry too much about a slope to a drain.c2=a2+b2;
When buildings made with lime are subjected to small movements thay are more likely to develop many fine cracks than the individual large cracks which occur in stiffer cement-bound buildings. Water penetration can dissolve the 'free' lime and transport it. As the water evaporates, this lime is deposited and begins to heal the cracks. This process is called autogenous healing.
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11th March 2008, 10:01 AM #7
In practical terms as well. If you don't have a fall, you will get ponding and associated issues - potential leaks, deterioration of joints, etc.
I intentionally make sure the fall is MORE than the typical falls done in toilets, esp. for shower areas.
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11th March 2008, 03:26 PM #8
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11th March 2008, 04:53 PM #9
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hey sorry i didnt read yer post properly the first time, yea could do that, put packing on top of the joists under ya fc sheets to get the fall and use a shower channel.. they are quite expensive if you get them custom made but you can get these ones made by mizu available through reece a bit cheaper(standard sizes). Will give your bathroom a real classy look, this system is usually done if your laying big tiles in a small area and the rqd fall cant be achieved
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28th March 2008, 07:01 PM #10
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can i add a question to this, our old bathroom floors are tassie oak with lino over the top. Come summer i'll be pulling the lino off, putting down 6mm cement sheet and tiling over it. Now, as there has never been a floor drain or any form of fall do i have to put one in (plumber) or can i simply tile the floor that has survived the last 40 years?
got an uncle that will take care of waterproofing, room has vanity, dunny and shower over tub.
Help appreciated.
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28th March 2008, 11:48 PM #11
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A renovation may warrant you putting one in, in a bathroom a floorwaste can only be omitted where there is a WC and a Basin only and these two fixtures must have internal overflows. It doesnt have to be connected to the sewer, you can run a dry floorwaste which simply is a normal grate, reduced to 2" under the floor and run out so it just pokes out past the external wall with a flap valve on it.
Plumbers were around long before Jesus was a carpenter
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29th March 2008, 02:51 AM #12
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Had the plumber in yesterday and he said the bathroom floor waste was optional. I said I wanted an emergency flood drain and he suggested the isolated flap-drain mentioned by wonderplumb. Wasn't worried about fall (floor is level), and advised against laying a mud floor on timber because it will eventually cause the tiles to crack (but maybe that's a cold climate thing). After talking to two plumbers and a builder ozpom I think it's safe to assume it is possible to get away without laying a screed
.
cheers
Brett
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29th March 2008, 10:16 PM #13
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thanks wonderplumb. seems an interesting one. some people saying it doesn't need to be there and you telling me it 'may' need to be there. I really don't want one there. 40 years with no problem i doubt with improvements to the place that it'll warrant needing one now.
Are you a plumber? What makes it possible to go without one? keeping in mind there isn't one there and hasn't been on there for the life of the house....
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1st April 2008, 06:15 PM #14
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Mate go for it, a lot of older homes where built with only a bath in the bathroom, with bits and pieces added on here and there, creature comforts such as an indoor flushing toilet!
It may have something to do with victorian legislation over the national code, each state has a seperate code of practice.
One of the houses I grew up in in the central west had carpet in the bathroom, and a lot of older homes in colder climates did have.
I was simply refering to the national code (AS 3500) where a bathroom shall (when the code says shall it means must) have a floor waste, UNLESS it is a powder room type of set up with a toilet and hand basin only and these two fixtures must have internal over-flows, but a floor waste is till desirable in these instances.Plumbers were around long before Jesus was a carpenter
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2nd April 2008, 02:36 PM #15
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LOL I can't imagine carpet in a bathroom. Our place has always had the shower over bath, toilet and basin in teh one room without a floor waste. Any places i rented were the same so it must be something to do with the Victorian codes. These things are never meant to be easy to find out are they!?!
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