I am proposing to build a small (4mx3m) single story extension to my 1960's bungalow. Access will be through an existing external window converted to a door opening. I obviously need to continue the existing FFL through to the extension and as such it would make things easier to use a suspended timber floor as the existing (albeit with insulation etc etc) . According to 'Approved Document C1' (Floors 4.14.a.ii) I could construct the oversite with 75mm concrete, on 1200gauge DPM, on (say) 25mm sand blinding. Although the joists will span the short width supported by joist hangers I want to put a 'sleeper' wall in the center to remove any floor 'bounce'. Will the above oversite construction be acceptable as support for the sleeper wall? or should I incorporate a 500mm wide x 100mmdp strip of hardcore under the wall area?
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