Although not really my line of work, I have a full bathroom refurb to do where the bath with overhead shower is to be replaced with a low-level shower and I'm a bit worried about potential issues with the existing low flow-rate of wastewater which puddles for short periods by about 3cm in the bath. I don't want the same happening in the 1400 x 800 x 45mm shower tray that'll replace it. A common problem I'm told.
The existing 40mm bath waste falls about 25cm in its approx 2.5 metre length to an open gully, and has potential for no more than 3 elbows hidden in the old pipe-box, so I can't see why that problem should occur. Maybe the 40mm pipe is a little gunged-up... it IS over 30 years old... or maybe the hidden pipe was badly installed and bows upward somewhere out of sight. Who knows?
Anyway, I'll be installing the shower where the bath is, burying a new 50mm pipe in the concrete floor, with swept bends and the minimum of joints, not tee-ing it to anything but straight out to the open gully, and fitting a high flow-rate waste and trap on the shower. Other than that, I don't see what else can be done.
Any advice?
The existing 40mm bath waste falls about 25cm in its approx 2.5 metre length to an open gully, and has potential for no more than 3 elbows hidden in the old pipe-box, so I can't see why that problem should occur. Maybe the 40mm pipe is a little gunged-up... it IS over 30 years old... or maybe the hidden pipe was badly installed and bows upward somewhere out of sight. Who knows?
Anyway, I'll be installing the shower where the bath is, burying a new 50mm pipe in the concrete floor, with swept bends and the minimum of joints, not tee-ing it to anything but straight out to the open gully, and fitting a high flow-rate waste and trap on the shower. Other than that, I don't see what else can be done.
Any advice?
