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bath wastes sizes

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Water Regulations Discuss all aspects of the Water Regulations in this forum.

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03-04-2008	#1 (permalink)
kwlondon Junior Member Join Date: Apr 2008 Posts: 2	bath wastes sizes Can anyone tell me what is the max length of a 40mm bath waste running into a 110mm stack before I have to up-size to 50mm? KW London
kwlondon Junior Member Join Date: Apr 2008 Posts: 2

03-04-2008	#2 (permalink)
wiggikins Member Join Date: Mar 2008 Location: LEEDS Posts: 33	Re: bath wastes sizes On a single stack max length of 40mm should be no more than 3m

04-04-2008	#3 (permalink)
kwlondon Junior Member Join Date: Apr 2008 Posts: 2	Re: bath wastes sizes Thanks guys, wastes are just on 3m so we should be inside tolerances.
kwlondon Junior Member Join Date: Apr 2008 Posts: 2

06-04-2008	#4 (permalink)
dleader Junior Member Join Date: Apr 2008 Posts: 1	Re: bath wastes sizes The answer that it doesn't matter is wrong!!!! The limit is 3.0m beyond this (or if you have problems) you should consider installing some method of ventilating the pipe IE running an additional pipe to allow air into the system to prevent the foramtion of a vacuum in the pipe as water flows through it or putting an air admittance valve in the system. With 50mm pipe you only allowing an additional 1m (limit 4m).
dleader Junior Member Join Date: Apr 2008 Posts: 1

10-04-2008	#5 (permalink)
ProffesorPlumb Moderator Join Date: Jan 2008 Posts: 155	Re: bath wastes sizes Thanks for that dleader

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