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Double Tee flooring units consist of two prestressed ribs and a connecting top slab.The depth of the Double Tees can vary from 200 to 600mm .The connecting slab is 2400mm wide x 50mm thick.

Double Tees are ideally suited for larger spanning floors with a wide variety of services suspended from the flooring system. Double Tees can easily accommodate large floor voids/penetrations through the slab region. The cast insitu topping is typically 75mm thick.

Sound Transmission

A major practical benefit of a concrete floor is its ability to reduce noise transmission. Double Tee concrete floors are quiet and do not creak with temperature and moisture changes. The table below shows sound transmission ratings achieved by Double Tees.

Material

Double Tee concrete strength = 45 mpa.

Topping concrete strength = 25 mpa (as required by NZS 3101:2006).

Fire resistance rating

2400 wide unit = 90 minutes for fire ratings or loads in excess of the allowable shown, please contact your local Stresscrete branch.

Seating

Hanger supported Double Tees must be bedded on a sand cement mortar (the consistency of blocklaying mortar) or on plastic bearing pads/strips. This must be evenly spread just prior to the unit being placed. Double Tee legs should be placed on cement mortar or on plastic bearing pads. Stresscrete Double Tees are designed as prestressed sections as per NZS3101. For minimum seating requirements refer to NZS3101.

Bearing capacity

Where high shear loads are combined with support beams or walls of low material strength, a bearing capacity check according to NZS3101 should be made; e .g .masonry bearing walls.

Double Tee Lifting

Lift Double Tees only at the lifting points provided. Chains or strops must be of correct length to carry equal load and must not be more than 30 off vertical.

Storage

Double Tees if stored on site must be supported at their ends on firm ground. Bearers between layers in a stockpile must be vertically above each other and units of varying length should not be stacked upon each other. Ensure the bottom bearers are not pushed into the ground, resulting in the bottom unit being supported near midspan.

Further technical information

Specifications for the manufacture, transport and erection of Double Tee units, and standard details for typical situations are available from your nearest Stresscrete branch. Experienced and qualified staff will be pleased to discuss design and fixing details.