Substructure and ground-bearing floors


Blinding shall provide a suitable surface for the materials above.

Infill should be sufficiently blinded to receive the concrete, and DPM where required, using the minimum thickness necessary to give a suitable surface.

Concrete blinding may be needed where voids in the fill could result in loss of fines from the blinding. Where hardcore fill is used, smooth blinding, e.g. sand or other suitable fine material, is essential to avoid puncturing a sheet DPM.

Where the ground floor is to be reinforced, blinding should be firm and even, to give good support for the reinforcement and to maintain the design cover using reinforcement stools, where appropriate.