Kerf Support System

Vertical application
Heavy materials
Curved facade

Designed and specified to support ornate and shaped stone façade panels, where it is not possible to use FZP undercut fixings due to stone thickness.

The system is an optimal solution for large and flat facades using L-brackets, vertical rails and special designed horizontal kerf rails. 

The horizontal Kerf rails are fixed into the vertical T & L profiles using tek screw or rivet connections. The kerf rail profile is suitable where the stone façade panel is supported using a groove in the upper and lower edge of the stone panel, this allows the stone panels to slot into the upper and lower rails.  

The system comprises of two different kerf rails, the intermediate kerf rail and the upper/lower kerf rail. The upper/lower kerf rail is typically used at the base detail, window junctions and head details. The intermediate kerf rail is used in-between stone panels creating a horizontal joint. 

The horizontal rails are designed to span 400-600mm between the vertical support structure.

Bracket and profile configuration is specified by RJ Facades technical department. To submit your project specifics please go to Facade Designer.

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  • Downloads
  • Approvals
  • UL Winmark Approval (UKAS Product Certification)

    The UL Certification covers the full range of brackets and accessory components. The aluminium and stainless EVT brackets and components are manufactured and fabricated in Europe and the UK at UL audited manufacturing sites.

    The Approval Covers

    A detailed overview of the certified products 

    Technical specification of the products 

    An initial assessment of the certified company's factory production control systems.

    Design considerations

    A review of the products documentation to help demonstrate compliance with the applicable requirements of the UL Scheme. 

    An assessment of the certified products contribution to any key requirement of the building regulations.

    An overview of the certified companies product installation requirements and procedures.

    An overview of all supporting test documentation used for the product evaluation. 

    Ongoing surveillance of the certified company's factory production control system and procedures.  

    The conditions under which this product certification is valid.  

  • Technical Characteristics
  • Typical bracket configuration uses the Fixed Point bracket at the highest position on the vertical rail to support the façade vertical dead loads. The Sliding Point bracket is used typically on all other positions on the vertical rail to absorb the project wind loading

    The system benefits from using a standard helping hand system, which is interchangeable with other RJ Facades helping hand systems based on the project requirements. 

    Bracket and profile configuration is specified by RJ Facades technical department. To submit your project specifics please go to Facade Designer.

    RJ Facades offer one of the UK's largest range of Helping Hand brackets which have been designed to help achieve the the required U-Value while helping to support the facade system going back to the backing wall.

    Project thermal calculations to confirm insulation thickness available on a project by project basis.

    RJ Facades design issued by the our technical department can be covered by Product and design insurance if required.

    System components available in AutoCAD and PDF downloads.

    RJ Facades offer a standard, available ex stock UK, range that covers most design requirements.

    All rails available to specific RAL colours in Qualicoat on an order to order basis.


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