Add toilet to first floor of a small cottage

Mineral1

Was it you that recently posted a similar thread about re-arranging the layout of an upstairs in a different property?

No offense meant here, but it sounds like you lack the knowledge and experience to buy a property on the basis of making significant changes to it, why not just find a property you already like the layout of?

SameOldRoundabout

pumas said:

Nothing is impossible, if you really want it. Speak to plumbers, bathroom shops. I had an upstairs bathroom installed, the waste pipe went under a bedroom, across the stairs and over the kitchen.

The minimum fall on a soil pipe is 10mm for every 400mm it travels. You’d be talking 250mm of drop over the 10 metres to the rear wall (If we assume that’s where it has to go. And also assume the joists go the right way). Even if he can come out elsewhere there’s no guarantee joists or floor voids will allow for the degree of fall needed. 

davidmcn

Mineral1 said:

Was it you that recently posted a similar thread about re-arranging the layout of an upstairs in a different property?

No offense meant here, but it sounds like you lack the knowledge and experience to buy a property on the basis of making significant changes to it, why not just find a property you already like the layout of?

I think this is at least the fourth thread by the OP about changing the internal layout of properties...

AdrianC

SameOldRoundabout said:

pumas said:

Nothing is impossible, if you really want it. Speak to plumbers, bathroom shops. I had an upstairs bathroom installed, the waste pipe went under a bedroom, across the stairs and over the kitchen.

The minimum fall on a soil pipe is 10mm for every 400mm it travels. You’d be talking 250mm of drop over the 10 metres to the rear wall (If we assume that’s where it has to go. And also assume the joists go the right way). Even if he can come out elsewhere there’s no guarantee joists or floor voids will allow for the degree of fall needed. 

Sideways to avoid the stairs, then out to the back wall and externally along the side of the kitchen/bathroom extension?

You'd need a much bigger room than that, though - From very roughly scaling the floorplan, I make the room you've marked up about 900mm x 900mm... Standard public bathroom cubicle size is 850mm x 1500mm.

dan_first_time_buyer

Mineral1 said:

Was it you that recently posted a similar thread about re-arranging the layout of an upstairs in a different property?

No offense meant here, but it sounds like you lack the knowledge and experience to buy a property on the basis of making significant changes to it, why not just find a property you already like the layout of?

Yes, it was me.
No offence taken. Looking at properties with the layout I want is what I normally do - it is just that sometimes I stumble upon such beautiful houses that would be otherwise perfect.
But I get your point.

AlexMac

I had a second loo installed in a long narrow single-storey upstairs flat once, and at the far of the flat from the existing loo and soil stack.  I simply asked my builder what was feasible. Despite the sensible sounding advice from SameOldRoundabout above, my guy had no difficulty running the usual 4 inch /10 cm diameter waste pipe the 12-13 metres or so, mostly inside the house to link to the existing stack. In one intervening bedroom, it ran along the wall at just above floor level in a boxed or panelled conduit behind a false skirting; which sounds clunky but was perfectly inconspicuous.  There was also a bath in the new bathroom, which probably helped flush the waste from the toilet pan, but my guy reassured me that you don't need much of a fall.

You don't say (?) if the house is detached, semi detached or terraced, but if either of the former, you might even be able to add a new, closer external or internal soil stack,  excavate and lay a new link to the drains or sewer.  Again, not a big deal for an experienced builder; we've had it done twice in different houses.  Once we had the existing internal stack relocated  outside too; again- quite easy as it's all done in plastic these days.

I'd avoid a "Saniflow" if at all possible.  A lazy solution!  The 5h17 and waste is literally minced  (eeuucch!) so it can be pumped out via a narrower exit pipe, but we lived below a 1st floor conversion flat which had one, and it sounded like someone was operating a drill or mega vibrator above us.  Luckily it failed and they found a plumber competent enough to replace it with a conventional gravity flow 4-incher.  Simples!

AdrianC

AlexMac said:

but my guy reassured me that you don't need much of a fall.

We've recently had a load of work done to the sewerage pipes outside the house, going to the septic tank. A large part of that work was primarily because of too little fall from toilets in an extension - which led to me getting the rods out on several occasions too many.

Frankly, getting the rods out once is too often, but...

Mineral1

AdrianC said:

AlexMac said:

but my guy reassured me that you don't need much of a fall.

We've recently had a load of work done to the sewerage pipes outside the house, going to the septic tank. A large part of that work was primarily because of too little fall from toilets in an extension - which led to me getting the rods out on several occasions too many.

Frankly, getting the rods out once is too often, but...

There's a specific max and min fall that's required for foul waste pipes by the building regulations. Too steep a fall also causes problems because the liquids overtake the solids which stop in place.