BU541 Concrete floor slabs

This bulletin describes the general requirements for on-grade concrete floor slabs as described in NZS 3604:2011 Timber-framed buildings. Also discussed are important changes to New Zealand Building clause B1 Structure.

The bulletin covers:

• Building Code requirements
• concrete specifications
• finished floor levels and foundation edge construction
• footings
• granular hardfill
• damp-proof membranes
• reinforcing
• slab thickness and dimensions
• shrinkage control joints
• curing, concrete strength and concrete cover
• internal loadbearing walls and slabs
• fixing of plates
• floor slab insulation and in-slab heating.