Floor Slab / Ground Bearing Slab

A reinforced concrete slab poured over a prepared sub-base to form the ground floor of an extension. The slab typically incorporates a damp proof membrane (DPM), mesh reinforcement, and either insulation above (screed floor) or below (insulated slab). Minimum thickness is typically 100 mm and must achieve a U-value of 0.25 W/m²K or better under building regulations Part L.