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Filling up a channel in the slab

Discussion in 'Floors, Stairs and Lofts' started by TeaAndBiscuits, 2 Jan 2018.

  1. TeaAndBiscuits

    TeaAndBiscuits

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    Hi all,

    I'm redoing my ground floor bathroom. It has a solid floor - concrete slab, 75mm polystyrene insulation and then screed.

    I've dug out the old soil pipe which was partially recessed in the slab in a sort of channel/trench that looks like it was cast into the concrete when it was poured.

    100_7772.JPG

    100_7810.JPG

    I'm going to be having a stub stack right in the corner and then just the single 40mm waste running down one side of the trench as in the picture.

    My question is - what should I fill the rest of the channel/trench with before recovering with insulation and screed? Sand? some sort of aggregate? or do I need to use actual concrete?

    Ta :)
     
    Last edited: 2 Jan 2018
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  3. bobasd

    bobasd

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    you could make up a rough mix of semi dry sand cement and stones.
    maybe get the mods to transfer your post to the plumbing forum.
     
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