LYSAGHT W-DEK®

LYSAGHT W-DEK®

Product Description and Features

LYSAGHT W-DEK® is one of a range of structural steel decking products available from BlueScope Lysaght.  It is an economical steel decking system which has been optimised to bring greater efficiency, speed of construction and economy. 

• One of the widest steel deck profiles currently available (700mm) in Australia
• Superior spanning capacity reduces propping requirements (4m plus unpropped spans)
• Excellent concrete displacement characteristics - reduces up to 40mm concrete over conventional concrete slabs
• Improved on-site safety with less propping, no stripping and minimal on-site cutting
• Can be used as permanent formwork or used to reduce bottom reinforcing
• Fast track construction, reduced time from floor to floor
• Safe working platform with wide flat ribs
• Soffit aesthetics with no or minimal deformations from prop marking

Common Uses of this product

Structural Formwork and flooring system for composite concrete slabs

Warnings

• Design & detailing should be carried out by a qualified structural engineer

Product Details

Schematic

Physical Properties

LYSAGHT W-DEK® is roll-formed from hot dipped, zinc coated high tensile steels, which conform to AS1397 grade G550, Z350.

1.2mm BMT, Grade G500, is not available in the design tables and software.  However, the solution using LYSAGHT W-DEK® 1.2mm BMT is available subject to enquiry. 

Spanning Tables

Formwork Construction and Quick Selection Tables

This information is to be used in conjunction with the LYSAGHT W-DEK® Design Manual. Download LYSAGHT W-DEK® Design and Construction Manual (912 KB)

Formwork table 1.00 BMT

No props per slab span

1 prop per slab span

Formwork table 0.75 BMT

No props per slab span

1 prop per slab span

1. Continuous maximum slab spans are limited as given in the Design & Construction manual for interior spans and total 6000mm limit.
2. Maximum formwork spans are based on L^l/240 deflection limit and ratio of two adjacent spans equal 1:1 and 100mm width of support.
3. Use LYSAGHT W 2004 software to get longer spans with L^l/130 deflection limit and wider supports.
4. These tables can be used in steel frame construction or other buildings where sheets can be securely fixed to supports.

Refer to LYSAGHT W-DEK® design manual for full note specifications.

General Notes

1. The tables shall be used for normal density concrete (2400kg/m³).
2. The lines of support shall extend across the full width of the sheeting and have a minimum bearing 50mm at the ends of the sheets and 100mm at intermediate supports over which sheeting is continuous, including at props. It may be necessary to locate formwork joints at permanent supports when sheeting is terminated to control formwork deflections.
3. The tables are based on the following maximum construction loads:
   · Workmen and equipment = 100kg/m²
   · Mounting of concrete = 3kPa over an area of 1.6x1.6m
   and zero over the remainder.
   · Stacking of material on LYSAGHT W-DEK® sheets before placement of
   concrete only = 100kg/m² which should be on drawings and controlled on
   construction site.
4. No loads from stacked materials are allowed until the concrete has set.
5. The sheets shall not be spliced or jointed.
6. Supports shall be effectively rigid and strong to support construction loads.
7. The sheeting shall not have cantilever portions.
8. Sheets should be securely fixed to supports by spot welding, screw fixing or similar methods.
9. Adopt 300mm form-ply on top of prop bearer to minimise prop marks where LYSAGHT W-DEK® is left to be exposed.
10. The information contained in the publication is intended for guidance on only. This information to be used only in conjunction with a consulting structural engineer.

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