Slab Defects !

Given concerns about the curing the slab in the hot conditions, we thought it was worthwhile having an inspector take a look at the completed slab. He found the following defects :

“At the west end of the entry, the slab is approximately 12 millimetres out of level over 2 metres.”

“At east side of laundry/west side of Bedroom 2, the concrete slab is approximately 10 millimetres out of level over 2 metres.”

The Building Commission’s Guide to Standards and Tolerances, Section 2.08 Levelness of timber and concrete floors states; “Except where documented otherwise, new floors are defective if within the first 24 months they differ in level by more than 10 mm in any room or area, or more than 4 mm in any 2 metre length. The overall deviation of floor level to entire building footprint shall not exceed 20 millimetres.”

I sent a copy of Inspector’s report on to Orbit. They indicated that they would pass the report on to the concreter so that they can rectify the slab as required. They mentioned a levelling compound would more than likely be used to rectify but it will be up to the concreter to check and arrange rectification as per industry standard.

Other issues identified by the Inspector were :

“The edge of slab on the south side has broken away in places and may require structural grout to be installed. Not of a structural concern and no exposed reo found.”

“Minor shrinkage cracks noted to several areas. Not of structural concern but to be monitored.”