Toilet soil pipe fall

W

walkern

Hello,
I've done my drains and the building controller is round on Monday, just wanted to check something.

On my run from toilet to waste (downstairs toilet) I have a fall of 150mm over 9m. I've calculated this as being 1:60 gradient, or 17mm fall every metre.

Is this ok? I think I've read that anywhere from 1:40 to 1:110 is ok and 18mm every metre is the starting point (from what I can find online anyway).
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Thanks.
 
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That's seems like a reasonable amount of fall. We have successfully laid drains with less. He may not like that bend in the run though.
 
There's a small bend from the toilet end, in the first picture. I figured this would be ok...
 
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Yeah it will be.
You should not have 90 degree bends but 30/15deg is fine.

It would have been better however to use pea gravel (river bed rounded etc) not angular gavel.
You'll also need to protect those pipes with a hard surface over the top (due to the depth) but I guess you are going to do a path so you'll be alright.
 
Well, I was told this is washed and 'made' especially for this job and better than pea gravel.

It should do at £35 a ton. Five more than my sharp and tenner more than mot 1.

Thanks for the advice, it's appreciated.
 
It's going going to make any difference now but pea gravel is self compacting/flowing and easier to move where as 1 inch clean can clump. BR says 5-10mm stone. You could have bedded it in sand also.
 

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