Waste Pipe distance

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DougySwiss

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• 12 Feb 2009

• #1

Hi,

We're converting our flat and will be moving the kitchen to the other side of the flat which will require running the waste pipe a distance of c.7.5m to reach the existing outlet. What advice would you give for the degree of incline from beginning to end? ie. How much should the pipe be raised for every metre?

Advice gratefully received!

Douglas

 

Dan Robinson

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• 12 Feb 2009

• #2

1:40

 

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Softus

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• 12 Feb 2009

• #3

Marley state a minimum gradient of 18mm per 1 metre, which is 1:55.

1:40 is about 1.5°.

Personally, I prefer 2.5°, which is 1:23, or about 43mm per 1 metre.

 

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Richard C

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• 12 Feb 2009

• #4

DougySwiss said:

which will require running the waste pipe a distance of c.7.5m to reach the existing outlet.

Click to expand...

7.5 meters exceeds the maximum length for an unvented branch; 32mm = 1.7m; 40mm = 3m; 50mm = 4m.

 

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Softus

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• 12 Feb 2009

• #5

Richard C said:

7.5 meters exceeds the maximum length for an unvented branch; 32mm = 1.7m; 40mm = 3m; 50mm = 4m.

Click to expand...

For some reason, Marley don't stipulate a maximum for a sink waste.

 

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Richard C

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• 12 Feb 2009

• #6

Softus said:

Richard C said:

7.5 meters exceeds the maximum length for an unvented branch; 32mm = 1.7m; 40mm = 3m; 50mm = 4m.

Click to expand...

For some reason, Marley don't stipulate a maximum for a sink waste.

Click to expand...

Building Regulations - Part H. I also often use the Hunter design guide for reference, it's one of the best around IMO.