Three Dee Concrete System
- Appraisal number 385
- Valid from
- Information provider
- BRANZ Limited
- Information type
- BRANZ Appraisal
The Three Dee Concrete System is based on panels of expanded polystyrene (EPS) insulation and steel reinforcement which are site applied with concrete. The system is suitable for the walls and floors of housing and commercial buildings.
The Three Dee panels consist of a layer of mesh on either side of an EPS core, welded together by steel diagonals (trusses) which penetrate through the EPS core. The panels are joined in the desired configuration on site and sprayed both sides with concrete to form a sandwich type construction. The exterior of the panels are finished with a weatherproof coating such as plaster while the interior surfaces (walls and ceilings) can either be plastered or lined with conventional lining materials such as plasterboard systems.
The Three Dee Concrete System has been appraised for use as a specific design structural wall and floor system for buildings within the following scope:
- with a maximum building height from the ground to eaves of 10.0 m; and,
- with a floor plan area limited only by seismic and structural control joints; and,
- situated in NZS 3604 Wind Zones up to, and including Very High'.
The Three Dee Concrete System has been appraised for use with aluminium window and door joinery that is installed with vertical jambs and horizontal heads and sills. (The Appraisal of the Three Dee Concrete System relies on the joinery meeting the requirements of NZS 4211 for the relevant Wind Zone.)