Gap between ground and joist on suspended timber floor.

10 May 2011
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West Midlands
United Kingdom
On a suspended timber floor how much gap is required between ground and the underside of the joist. Is soil below allowable? or does a DPM need to be fitted.
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You are looking at a minimum 6"gap.

You can't just leave the soil there. It needs some concrete (usually minimum 4" thick, or 2" if on a damp-proof membrane) to keep the dmp down.
Alternatively 2" of any inert, compacted material on a dpm, such as sand, gravel etc.
freddymercureystwin, kindly posted this definitive Blg Regs statement: -page 27 of the pdf.

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