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Flush Twinline Dual Gasketed Seismic Floor Covers

Flush Twinline floor covers are dual gasketed flush covers ideal for areas with added thermal movement, while maintaining a flush profile.  Designed for joints larger than 50.8mm.

These covers are suitable for carpet and vinyl applications, the flush design eliminates tripping hazards and offers a smooth transition for light wheeled equipment. Twinline feature a deep extruded aluminium base frame, and has four standard gasket colour options. Joint sizes range from 50.8mm up to 101.6mm (2" - 4").

  • DGTP — Deep frame Gasket Twinline exposed Plate
  • DGTR — Deep frame Gasket Twinline Recessed plate 
  • GTP — Gasket Twinline Plate
  • GTR — Gasket Twinline Recessed
Key Features
  • Minimal exposed surface 
  • Hygienic, low trip hazard, and suitable for wheeled equipment
  • Sealed dual durometer gasket installation
  • Larger movement (> 50mm)
  • ISO 9001: 2000 compliant
  • 5 year limited warranty
  • Available in 4 standard colours, with options for custom colour matching
Scope of Use
  • Ideal for interior areas with larger movement requirements where hygiene is important
  • Suitable for light wheeled equipment
  • Joint size: 50.8mm up to 101.6mm (2" - 4")
  • 100-200% of joint width
  • Option of recessed cover plate accepts carpet and tile to conceal the cover in the surrounding floor


  • Carpet
  • Vinyl
Statement of Building Code Compliance

This product, if designed, used, installed and maintained in accordance with the statements and conditions of the technical literature, will meet or contribute to meeting the following provisions of the NZBC:

  • Clause B2 Durability
  • Clause F2 Hazardous Building Materials
In-Service History

Construction Specialties NZ Ltd. has been operating in New Zealand as a manufacturing distributor of the Construction Specialties range of products since 1988. Construction Specialties is a privately owned USA based, global company. Here in New Zealand, CS are privately owned and run as a wholly separate entity.

Recent / Current Projects:

  • NZ International Convention Centre
  • CCEV
  • Metro sports CHCH
  • Wellington Town Hall
  • Wellington Children Hospital
  • Wellington District Court
  • Wakefield Hospital
  • The Langlands Hotel Invercargill
  • Summerset group (Nationwide New Build)
  • Ormiston Town Centre
  • Cordis Hotel
  • 55 Corinthian Drive Albany

Past Projects:

  • Auckland Airport Expansion
  • AUT and UOA University projects
  • Christchurch Acute Hospital
  • The Terrace Christchurch
  • UOC Christchurch
  • Starship Hospital
Other Performance Attributes
  • ISO 9001: 2000 compliant
  • CS Seismic and Expansion Joint Covers have been tested to ASTM E1399 / E1399M - 97(2017) Standard Test Method for Cyclic Movement and Measuring the Minimum and Maximum Joint Widths of Architectural Joint Systems


  • CS Expansion Joint Covers feature a 5 year limited warranty
  • Installation: 2 years
Data Sheet: Flush Twinline Floor


Masterspec: CS Group
Catalogue: Expansion Joint Covers


Joint Selection Chart


Manufacturer and installer of wall protection systems, entrance matting, expansion joint covers, solar shading, louvres, cubicle curtain track and pressure relief systems.

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