help with plumbing of a sink Drainage and wastage systems and plumbing help, advice and answers

[rose]

have downstairs cleakroom and have re-arranged to placement of wc and sink.
the waste pipe for the sink has been positioned under the concrete floor that the builder dug up.
question 1

is this right?
what happens if need to change the pipe at sometime

I thought the pipe should be above ground level going out of the wall to the manhole

any help appreciated

[Steve the gas]

Hi Rose,

A single pipe going thru concrete vertically or nearly horizontal (correct fall) is ok IMO.

Hth

[acsimpson]

Could you please let me know what would be considered the correct flow for a waste pipe? If it differs by diameter then I'd be interested in 32mm and 40mm.
Thanks.

[Steve the gas]

Not level or upwards, which I hope is obvious!!

I think its 1 in 40 ??

[TheDoctor5]

Last year 64% of the questions asked in our forum were answered within our DIY project pages at www.diydoctor.org.uk/projects.htm The project pages are now separated alphabetically and your answers are accompanied by diagrams and the ability to see, and buy, the tools and/or required to complete your project. Use our search box to look for your answer and save a great deal of time and money!

[acsimpson]

[quote="jamjar123"]Last year 64% of the questions asked in our forum were answered within our DIY project pages at www.diydoctor.org.uk/projects.htm The project pages are now separated alphabetically and your answers are accompanied by diagrams and the ability to see, and buy, the tools and/or required to complete your project. Use our search box to look for your answer and save a great deal of time and money![/quote]

Thanks, I don't know if you are refering to my question or the original poster. Before I asked my question I checked the project and I have just repeated my search and can't find any information about gradients of pipes this diameter.

Acs

[thedoctor]

Hi AC. This post was not directed at you, Its a general post to get people to look at the projects. The fall of waste pipes is indeed 1 in 40 and is shown in our project on fitting waste pipes for basins etc project. Its also in the project on changing from a cast iron waste to a plastic waste.