The tolerances called up in table 5.2 NZS3109 “Tolerances for in-situ construction” are not achievable on elevated concrete floors. The relationship to datum is specified as +/-10mm. With  deflection and ongoing creep this is not going to be acheived. Then for flatness it references NZS3114 requirements. 5mm in 3m is also not going to be achieved 100% of occasions and if you have … Continue reading Quoting an Elevated Concrete Floor – tag out the flatness risk!