converting bedroom to bathroom

[gates1979]

I am converting my front bedroom into a bathroom and this is the layout im told we are having it. The problem i am having is getting the waste from the bath to the stack. Is the red line on the pic the only route i can go

 

[gates1979]

also what size pipe 40/50mm

 

[WHPES]

Follow the British Standard specifications for pipe length, diameters and fall. If you can't achieve this, then back to the drawing board.

Can't you put the shower-bath where the sink is and put the sink under the window? Would solve your problem. I usually put heated towel rails and cupbards on the opposite side to the stack.

Don't forget you need to get approval from Building Control for your job before you start.

 

[gates1979]

The sink will be on a boxed off section where the stairs come up through the bedroom if that makes sence. The regs say max length for 40mm pipe is 3m can this be extended if i put a AAV on the pipe

 

[stevetheplumber]

You would have less problems with the fall if you drop between the joists under the bath and run external
id run 40 mm to external and 50mm external
you could fit a deep seal anti vac trap on the bath to be sure it doesent pull but generally there is so much run of with a bath that the trap will seal but traps on wastes to soil need to be deep seal anyway so best to fit the anti vac one clearing eye tees on exit from wall and again when it turns the corner

 

[gates1979]

I have a porch with a pitched roof under the window and the peak is above the floor level so thats why ive had to run it inside, The run is going to be about 5m to the stack and 18mm being the minimum fall thats about a 90mm drop from trap to stack if i can achieve this and fit a aav to stop siphonage will that be ok

 

[justlead1]

Can you drop the ceiling in the room below?

 

[gates1979]

I could probably box in the pipe but would like to avoid this if poss can i not do what i mentioned above with the aav

 

[quality]

Not the best way to go but a sanivite is an option

 

[Bernie2]

Hmm!

A bath full of water, the bath itself and the person in it weigh a lot. Check out the load bearing factors for the joists you don't want a bath coming through the ceiling and bring half the house down do you?

Look up Building Regs for max loading of joists and contact Building Control to check it out and get approval for change of use.

 

[gates1979]

Are the joists different in a bathroom to the rest of the house?

 

[gates1979]

How do i go about getting building control out do i just phone them and they send a guy out or do i have to send plans in for them to look at first. This is the first time i have had to do this so i am just wondering whats involved

 

[GQuigley67]

the bigger the pipe in diameter, the longer the run that is allowed, so you would be best doing the waste in 50mm with a tee reducing to 40mm for the bath.

 

[justlead1]

The problem you are facing is quite common on refurbishment. Why not add a bit of interior design by forming stud wall say 1m high around area that bath waste travels with a shelf on top for the perfume bottles etc and a mirror above it. all adds a bit of glamour, provides a service duct and looks part of design.

 

[Bernie2]

Structural Building Regs a free download on gov website will tell you about loading joists. If you work it out from them you will save yourself a load of hassle, because conforming to Building Regs are part of what the building inspector will be looking for.

So if you plan it using the appropriate Guide to the Building Regs both for your waste pipes and joist loading then the chances are the Building Inspector will simply pass it no bother. The guy or gal Building inspector is employed to make sure a house is structurally safe not to give hassle.

Just Google "Guide to the Building Regs UK" it usually comes up with an appropriate website you can get them off for free.

 

[stevetheplumber]

i wouldnt worry about joist sizes as they will be same all over but do put some timber under the bath legs to spread the wieght especialy on chipboard 3x2 laid flat and bestpractice is to fit a 3x2batten under the rear edge of bath which also helps to get it level