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Ask The Trades › DIY Forum › Plumbing Questions › New drains in mill conversion

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New drains in mill conversion (Read 4164 times)

SHBS GDPR opt-out	New drains in mill conversion Dec 14^th, 2010, 4:24pm I am about to start conversion of a small mill and the only thing that worries me is the drains. Is it standard practice to concrete in a hub? Should I connect the WC, shower and sink drains to the hub/vent stack then concrete them in before laying insulation and underfloor heating? Stuart
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thescruff Global Moderator Trade Member Author Offline Who said plumbing was easy. Posts: 6037 Total Thanks: 147 For This Post: 0 Gender: Trade: Plumber	Re: New drains in mill conversion Reply #1 - Dec 14^th, 2010, 6:02pm Download approved document H, it contains everything the building inspector will want to see and check.
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SHBS GDPR opt-out Total Thanks: 147 For This Post: 0	Re: New drains in mill conversion Reply #2 - Dec 15^th, 2010, 9:52pm I have part H but it doesn't mention drains under floors. I suppose if I just follow the rules I will figure out what is possible.
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CWatters

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Re: New drains in mill conversion
Reply #3 - Dec 15^th, 2010, 11:13pm

If you must have a junction indoors consider the implications of 2.49d which may mean you may need a (sealed) inspection/access hatch in the floor.

Normally you avoid this by either running pipes..

a) Above floor to a stack or stub stack (Diagram 2, 5 and 7)
or
b) To the outside and then join them up out there (Diagram 1, 7 and others).

Note also the minimium/large bend radius at the bottom of a stack and the minimium height of a connection.

« Last Edit: Dec 15^th, 2010, 11:14pm by CWatters »

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Re: New drains in mill conversion
Reply #4 - Dec 23^rd, 2010, 8:52am

Thanks for directing me to 2.49 but it's not usual to provide access to junctions into the soil stack is it? They must be talking about the main drains not branches. In my house built in 1993 there are rodding points outside to clear the main drain but if a sink was blocked and couldn't be unblocked with a plunger then floors would have to be lifted and boxed-in bits opened up. I suppose I should just wait until I apply for a building warrant and ask the inspector.

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Re: New drains in mill conversion
Reply #5 - Dec 23^rd, 2010, 11:56am

Quote:

it's not usual to provide access to junctions into the soil stack is it?

No, they are frequently boxed in. Not sure if that counts as "access" but you don't often see proper hatches. I was really refering to junctions in the floor/ground. Perhaps I missunderstood what you meant by..

Quote:

Is it standard practice to concrete in a hub?

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