“the permissible deviation in thickness of ground floor slabs should be not more than 15mm”
“the specification for the sub-base surface level should be restricted so that the permissible construction tolerances give at worst low levels (i.e. 0mm / -25mm level tolerances)” f) TR34 ed 2 Supplement (1997) goes on to specifically state the tolerance of level to datum plane for the surface of FM2 floors should be ± 15mm. g) TR34 ed 3 (2003) is consistent and the above requirements apply equally. h) Applying these considerations the minimum thickness of the slab should be 135mm at any point. Applying the above to the floors in question, the thickness was seen to vary considerably over the slab; thin areas, less than 135mm, were scattered over the area of the slab; and Co-op and its experts had no ability to estimate or predict whether areas of existing slab, left in place, would all be sufficiently thick to withstand the intended loading. The Court is referred to the thickness survey data at Appendix A2 of the Decision to Replace the Warehouse Slabs. For the avoidance of doubt, this degree of inadequate thickness meant that the slab’s performance, consistent with the Specification, could not be assured in service. Moreover, no amount of increase in fibre would ever have addressed these problems.”