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Advice on bathroom split to two rooms

Hi Guys

I'm looking for advice on how the drainage would most likely be installed/altered from existing to proposed layouts below. I'm hoping to get an idea of the extent of the work involved. I understand the floor will have to be cut and dug up then made good once the drainage has been installed. Thanks in advance.

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Jason

Welcome to the Bunnings Workshop community @GC9114. It's great to have you join us and we are looking forward to seeing how you can transform your bathroom. Can I ask what is your aim for this project?

Apologies for the delay in getting back to you. Let me tag one of our resident Bunnings D.I.Y. experts in @EricL as well as experienced members @Vis-á-vis and @redbournreno to help kick off the discussion.

We trust you'll get loads of helpful advice and inspiration for all your projects from our wonderful community.

Thanks,

Jason

Vis-á-vis

Hi GC,

When you say the floor cut then I assume you are on a concrete slab?

Ultimately a plumber will need to advise you but most of what you have seems like not much of a change. Falls in the waste pipe from your shower and vanities can have a fair bit of variance so long as they meet a minimum. Falls from the WC are not so flexible - you need a minimum amount of fall to take the water away but too much and the water will run too fast leaving solids behind.

Everything will really depend on where your current waste pipes fall to and how far away they are from the proposed WC.

Most things are possible these days. You just need to be flexible to a degree and have a good plumber on hand.

GC9114

@Jason thanks for the reply, aim of the project is to make better use of such a large bathroom that is attached to a guest room. The changes will add a grnd floor wc that has its own access rather than entry through the laundry. Also there will be much needed modernisation of the room.

GC9114

@Vis-á-vis thanks for the comments. I understand the falls etc being in construction most of my life. How would the the plumber determine where the drains ran? Service locator with attack wire? Camera?

Vis-á-vis

If I understood plumbing wizardry then I too would have a couple of boats and a choice of vehicles to tow them.

More seriosuly.. start off with an educated guess. Look at you property and then check on dial before you dig to see where the main sewer lines run. Is your new plumbing upstream or downstream of existing plumbing? How far away? If you are downstream then it should be fairly easy to plumb in to the existing pipe. If you are upstream then measure from your new WC to roughly where the outlet for the old one is, work out a minimum fall of 1 in 40 and a max of 1 in 100 and see what that gives you in overall drop in height. Is that number within the thickness of your slab? If so then you are probably fine, if not call a plumber.

MitchellMc

Hi @GC9114,

There doesn't appear to be an incredible amount of drainage that needs to be installed here. The shower stays the same, and the corner bath is being replaced with a standard one. So, it's just the two vanities that need the wastes connected and a toilet on the external wall. Hopefully, the sewer runs outside, and the plumber can connect the new toilet to it without cutting across the slab. As @Vis-á-vis mentioned, it really depends on where that sewer line runs. I believe there are options out there for the vanities to run the wastes through a cavity wall's thickness. This depends once again on where the sewer line is.

Ultimately it's going to be the plumber you've contracted that dictates how they'll connect up the wastes. I'd suggest getting a couple of quotes to gauge the extent of the work involved.

Please let us know if you have further questions.

Mitchell

GC9114

@MitchellMc thanks for the comments. If the sewer line does run down the outside of the property, hope it does, would the toilet waste be likely to go through the wall and then dig down on the sewer to connect. Haven't engaged a plumber as yet just trying to get my head around it so I don't get given any bull. Thanks again

GC9114

@Vis-á-vis thanks for the comments. New wc is downstream of existing, so here's hoping the sewer is outside the building.

MitchellMc

@GC9114,

You could use a "P" trap pan straight out the wall, but you'll have exposed sewer pipe outside. It's likely best to go straight through the slab and then outside underground, so everything is not exposed.

Mitchell

EricL

Hello @GC9114

It's great that you've received excellent advice from @MitchellMc and @Vis-á-vis. Just to add to the advice given, just keep in mind that the most expensive part of your plumbing job will be the concrete cutting. If you look at your updated drawing the waste pipe for the shower is already there, so no need to add a new one. The waste pipe for the new bath is already there as well, might need a bit of repositioning but no need to add a new set.

The existing plumbing for the vanity can be split in two, one for the 900mm vanity and one for the 1200mm vanity. Again, just additional pipework, but the plumber will not have to bring in anything from the outside. The other big job is digging outside and connecting to the sewer pipe for the new toilet.

My best advice for this alteration that you're planning is to ask for a detailed job list. Make sure that it's in email form, don't accept a verbal job agreement as you'll be playing catch up with them to get the job finished. Make sure that a finish by date is indicated on the contract and most importantly the terms of payment must be very clear. One last thing if the plumber has to return for the final fit-out, make sure that it's clearly indicated on the job list that they will return for the fit-out.

Warranty is very important for new bathroom renovations. Make sure to file all the dockets on shower mixers, tap mixers, toilets, towel rail holders and anything that has a two or three-year warranty. Every time the plumber buys a fitting make sure to ask for a copy of the docket for your own personal file so that if you need to claim a warranty you will have proof of purchase.

Please keep us updated with your progress, we look forward to seeing the start of your bathroom renovation.

Eric

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