CGL Hook-On Rainscreen - Cladding System

CGL Hook-On is a rainscreen cladding system for use in a facade that uses cassette type panels secretly fixed into the CGL CS2-1 extruded aluminium support structure, supported by helping hand brackets attached back to the primary structure. The rainscreen wall design shall include all components such as membranes and insulation that together will ensure compliance with current building regulations.

The system is a drained, rear-ventilated rainscreen façade. Air pressure in the cavity behind the panels generally equalises with pressure outside to prevent wind-driven rain from entering the cavity. Any moisture which does enter the cavity, drains down the back of the panels and exits in a controlled fashion at horizontal joints and the base of the façade.

In order for the rainscreen principle to function, the backing wall from which it is supported must achieve certain standards of air permeability, stipulated in The Building Regulations, and be capable of accommodating transmitted live and dead loads. The backing wall must also achieve specified performance requirements for fire, acoustics, and condensation risk.

Cassette Panels are formed from flat sheet to suit project specification. Panels are nominally 50 mm deep and can be made in portrait or landscape format. CGL recommend panels do not exceed 3800 x 1300 mm face sizes due to material constraints. CGL will undertake structural design of the panels which will determine the positioning of any stud welded stiffening struts on the rear of the panels, to inhibit deflection under load to allowable limits for the material.

The system have been formally tested with certification from a UKAS accredited testing facility, which complies with testing requirements laid out in the CWCT publication, 'Standard for systemised building envelopes - 2005'.

Features and benefits:

• Precision made with maximum 30 mm joints in both directions.
• Suitable for large and bespoke sizes.
• Can also be supplied perforated if required.
• All season installation.
• Easy maintenance.
• Mechanical fixing methods with no use of flammable adhesives used.
• Stiffeners/ carriers, if required are stud welded to rear of panel (subject to product design review).
• Ventilated system.
• Designed and tested using Hilti MFT-MFI brackets.
• Site installation friendly, can be installed from top to bottom, or bottom to top. Also, individual panels can be removed and re-installed without removing adjacent panels.
• Fire tested to BS EN 13501-1 certification.
• Centre For Window & Cladding Technology Sequence B Dynamic Tested in accordance with NHBC testing requirements.

With the exception of Cor-Ten Steel, a removable protective film is supplied on all panels and remains in place through the fabrication and installation process to inhibit damage. CGL recommend the film be removed on day of panel installation otherwise there is a risk that adhesive residue/staining will remain on the panels after later removal.