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Flush Twinline Seismic Wall/Ceiling Covers

Twinline wall and ceiling covers are designed to allow for greater ranges of movement while maintaining a seamless look. Designed for joint sizes 50.8mm to 101.6mm (2" - 4"). Features a lightweight panel designed to disengage from the wall during a seismic event so it doesn't damage surrounding wall surfaces, and an exclusive hook-and-loop system with shock cord prevents panel from falling off the wall.

  • SGW — Seismic Gasket Wall
  • SGC — Seismic Gasket Ceiling
  • GTW — Gasket Twinline Wall
  • LAF — Lightweight Acoustical Flush
Key Features
  • Minimum exposed surface
  • Sealed gasket installation, larger movement
  • ISO 9001: 2000 compliant
  • 5 year limited warranty
Scope of Use
  • Ideal for interior applications with larger thermal movement requirements
  • Hygiene applications
  • Matches Twinline floor covers
  • Joint size: >50.8mm
  • Total movement: 100-200% of joint


  • Drywall
  • Ceramic tile
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 Wall/Ceiling


Masterspec: CS Group
Catalogue: Expansion Joint Covers


Joint Selection Chart


New Zealand based manufacturer and installer of seismic & expansion joint covers, performance louvres, wall protection systems for the aged-care and healthcare sectors and entrance matting,

Product Enquiries

News from Construction Specialties

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