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Dimond Flatdeck

Flatdeck is a versatile, lightweight composite steel flooring system that makes full use of the combined structural properties of both steel and concrete. The result is a strong, stable and durable residential/commercial floor – a floor which provides thermal storage, soundproofing and fire resistance.

Flatdeck provides easy installation without the requirement for end caps, thinner concrete slabs over longer spans and a flat soffit suitable for use as an exposed ceiling. Flatdeck is manufactured by roll forming G550, Z200 Galvanised Steel in either 0.75mm or 0.95mm thick material and forms a composite Steel/Concrete Floor System, which provides both permanent formwork and positive tensile reinforcement in one way reinforced concrete slab construction.

Key Features
  • Self-locking laps and minimal components make for quick and simple installation
  • Lightweight sheets are ideal for remote or difficult access sites
  • Flat soffit appearance allows use as exposed ceiling for modern industrial look
  • Economic alternative to poured slab on hard fill for sloping sites
  • Excellent acoustics and fire performance
  • Residential and commercial projects
Categories / Ranges
Steel Formwork and Reinforcement
Scope of Use

Dimond Flooring Systems use a roll-formed profiled galvanised steel sheet as a component in reinforced concrete floor systems.

The sheet provides both permanent formwork and positive tensile reinforcement in one way reinforced concrete slab construction over concrete block walls, poured concrete beams, steel beams or timber beams, which are subject to environmental limitations referenced to the appropriate grade of material selected.

Limitations on Use

It is critical to product performance that the loads applied, spans, formwork material thickness and overall slab thickness are designed within the appropriate Limit State Loads and limitations published in the Manual.

Statement of Building Code Compliance

Past history of use of Dimond Flooring Systems indicate that provided the product use and maintenance is in line with the guidelines of this manual, Dimond Flooring Systems can reasonably be expected to meet the performance criteria in Clause B1 Structure and B2 Durability of the New Zealand Building Code (NZBC) for a period of not less than 50 years, provided they are kept free from moisture.

Dimond Flooring Systems designed using the Fire Design Sections 3.3.6 and 3.4.6 of this manual and HERA Reports R4-82 and R4-131 as appropriate will meet the performance criteria in Clauses C3 and C4 of NZBC.

Unless noted otherwise in the Noise Control Sections of the Manual (3.3.7 and 3.4.7), Dimond Flooring Systems that are stated to achieve Sound Transmission Class (STC) and Impact Insulation Class (IIC) of 55 meet the requirements of the current NZBC Clause G6.

In-Service History

Dimond is New Zealand's largest manufacturer of steel roofing, cladding, structural and rainwater goods.

B1 Structure compliant
B2 Durability compliant
C Protection from Fire compliant
Protection from Fire
G6 Airborne and Impact Sound compliant
Airborne and Impact Sound
CAD/PDF (link to page on supplier website)
Flooring Systems Design Guide
Dimond Structural Systems Technical Manual
Maintenance Instructions
Specification Clause (Masterspec)
Installation and Operation

As part of the Fletcher Steel family, Dimond Structural offers technical expertise backed by a history of supplying purlins and composite steel decking in to a range of major New Zealand projects

Product Enquiries

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