Chimney breast. Cementing base

8 Sep 2012
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West Midlands
United Kingdom
We removed a opening on a chimney breast(it's not linked to a chimney as the breast in first floor has been removed).below floor level it goes quite deep down. I want to make some shelves in the chimney breast. Someone recommended I put a damp proof sheet and cement in this hole under the chimney breast? Thoughts?
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All remaining soot on the flue walls must be removed by wire brushing and SBR blinding before rendering the opened chimney breast with a 3:1 sand and lime mix.
A photo of the below floor level void would help?
Do you have a suspended floor or a basement?
The chimney breast looks clean as it was removed from being a chimney a while back. It's a suspended floor
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Why not search above for "hearth fender wall" to get an idea of the hearth area construction.

You could fill the "hole with hardcore, blind with sand and lay a plastic membrane over. Then pour a 100mm concrete base.

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