CT | Cavity Tray | Construction | Products | Siderise

Siderise CT | Cavity Tray

The Siderise CT Cavity Tray has been created specifically to provide a comprehensive compliant solution for steel-framed buildings both above and below 18m. Unlike similar products on the market, it comprises a flexible aluminium cavity tray with integral non-combustible insulation, creating a single-component solution that is simple to specify and install.

  • BBA Certified (21/5978)
  • NHBC, LABC and Premier Guarantee approved
  • Classified as 'A2-s1, d0' to EN 13501-1. Report available upon request
  • Meets the requirements of Approved Document B for steel framed buildings over 18m
  • Corners easily cut on-site
  • No hot works or power tools required
  • Linear application rate of up to 100m/hour (in class room tests)
  • Easily accommodates building site tolerances


This robust patent-pending and factory-engineered design not only provides reliable quality and performance but offers exceptional installation benefits on site: the product is light-weight, flexible, safe to handle, and can accommodate both site tolerances and building movement. Installation speed is exceptional, and corners can be quickly formed on-site, without requiring expensive and time-consuming bespoke units.

Cavity trays perform the job of a damp-proof course. They are angled to bridge the cavity in a way that directs moisture away from the inner leaf and enables it to drain externally.

This helps to prevent lingering moisture, making sure that any rain that gets through to the cavity does not reach the inner leaf. This reduces the risk of damp which can cause serious problems for buildings and occupants alike.

Siderise CT Cavity Tray is classified as 'A2-s1, d0' to EN 13501-1 and has been developed to meet the requirements of Approved Document B for steel-framed buildings over 18m.

Siderise CT has been BBA tested and certified (No. 21/5978), and is NHBC, LABC and Premier Guarantee approved.


For Technical Support with this Siderise Insulation solution please contact:


T:+44 (0) 1656 335819