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Exterior Seismic and Expansion Roof Covers

Construction Specialties have expansion joints and seismic roof covers for flat and built-up roofs. The metal and bellows roof covers expand and contract for multi-directional movement and are suitable for joints larger than 50.8mm. 

The cover’s aluminium frames are designed to create a weathertight seal on the underside of the sliding metal cover.

  • RJT — Roof Joint with Turnbar
  • SRJ — Seismic Roof Joint
Key Features
  • Weathertight seal
  • Formed aluminium and EPDM bellows options
  • ISO 9001: 2000 compliant
  • 5 year limited warranty
  • Variety of finishes available
Scope of Use
  • Suitable for flat and built-up roofs
  • Full range of movement
  • Joint size: >50.8mm
  • 100-200% of joint width
  • Suitable for all roof finishes
Limitations on Use
  • Non trafficable — marked "Do Not Step"
  • Suitable for maintenance access only
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 E2 External Moisture
  • 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.

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: Exterior Roof


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

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