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Underslab drains, lintels


WWilts

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Do the underslab drains go best in the hardcore layer or the ground beneath, or partly in each? Maximum distance 11m to get the drain out of the footprint.

 

Would you use one concrete lintel for each leaf of cavity wall or one wide lintel spanning both leaves?

Underslab section measured.jpg

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Just now, WWilts said:

Understood now, thanks.

 

How about connecting a sink or shower drain into the underslab WC drain (after the invert)? Is that allowed?


Yes but needs planning - you ideally want to go into the side and with the flow, not tee it into the top. 
 

Has this not all been done for your building regs drawings by the architect or AT..??

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Private BC inspector.
Builder & groundworks subcontractor have considerable leeway in rearranging sanitaryware and underground drainage.

BC will ensure compliance with regulations.

Just trying to understand the pros and cons of options/alternatives.

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