Plumbing Question

jims-terrano · 16-07-2019, 21:35

A bit of a strange question this one, back in January I fitted out an en-suite or at least partially. I fitted a loo and a basin, loo waste already there so not causing a problem. Basin waste obviously has a standard bottle trap with a short verticle drop below floor and then a short length of 32mm with a slight drop leadingto an elbow dropping through ceiling of carport to a length aprox 6 foot with a small fall with a final elbow to a vertical fall of about 7 feet to a gulley. All seems to run away fine without problems. During this spell of hot weather I’ve noticed a smell in the en-suite and have tonight traced it to the basin plug hole. It’s like there is no water in the trap letting the smell up from the drain. There’s no leaks at all so I know there must be water in the trap. There is no other waste attaching to the waste pipe so can’t be a vacuum siphoning the water out of the trap.
Scratching my head on this one.

16-07-2019, 21:35	#1
jims-terrano Senior Member Join Date: Sep 2004 Location: UK Posts: 12,965	Plumbing Question A bit of a strange question this one, back in January I fitted out an en-suite or at least partially. I fitted a loo and a basin, loo waste already there so not causing a problem. Basin waste obviously has a standard bottle trap with a short verticle drop below floor and then a short length of 32mm with a slight drop leadingto an elbow dropping through ceiling of carport to a length aprox 6 foot with a small fall with a final elbow to a vertical fall of about 7 feet to a gulley. All seems to run away fine without problems. During this spell of hot weather I’ve noticed a smell in the en-suite and have tonight traced it to the basin plug hole. It’s like there is no water in the trap letting the smell up from the drain. There’s no leaks at all so I know there must be water in the trap. There is no other waste attaching to the waste pipe so can’t be a vacuum siphoning the water out of the trap. Scratching my head on this one.