Britframe - The Lightweight Over Roof Solution


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Product Range

Britframe System Types

Britframe offer a comprehensive range of products that will provide a permanent solution to the most technically challenging of troublesome flat roofs. Our core products are provided in three main systems each with its own unique properties and ability to provide a solution for all existing roof structures and permissible loading parameters.

Our design team will make an initial visit to site to establish the key parameters of the existing structure. From this assessment our designers and will make recommendations on the most suitable Britframe solution to ensure a cost effective, functional and aesthetically pleasing solution is proposed. All complemented by one of the comprehensive range of Britmet outer sheets and full suite of flashings and rain water products. Providing a one stop fully designed system all supported with our 40-year guarantee.

Britframe “Propped Frame System”

The propped rafter system is a factory manufactured system that can be supplied to site in either a kit of parts, or semi- assembled. Propped rafter systems are designed to transfer new loads via the existing deck directly to existing primary support structures; typically fixed at centres from 1200mm to 3000mm, and provide a maximum roof pitch of up to 45°

Our curved propped rafter system is a variation of the propped rafter system, and provides a support system for curved roof scapes. This system is ideal for creating a curved radius utilising a new standing seam type roof sheet. The propped rafter system is supported when delivered to site by a full set of site assembly drawings and full technical assistance to ensure that contractors are fully conversant with our designs and the method of installation. This Britframe system offers an excellent balance of flexibility, cost effectiveness and speed of assembly.

Britframe “Full Spanning Truss System”

Britframe full spanning trusses are typically fully factory assembled trusses. Precision manufactured in our state of the art 40000sq ft. facility in the West Midlands. Spanning trusses can be manufactured to suit the majority of roofscapes with the most demanding of design parameters. Our designs are intended to make trusses as practical as possible for ease of handling during transportation, off loading and installing. Spanning truss systems offer the quickest means of assembly on site but rely on the building parameters being comprehensively surveyed by our design team at an early stage. This will allow us to provide the most suitable design for the application and establish key factors in the anchorage of trusses back to the existing structure.

Britframe spanning trusses are available in two types of truss systems:

  • Point load Truss - Fully assembled truss requiring certain point load areas on existing deck for support.
  • Free Spanning Truss- Clear spanning wall to wall (max 12m)

Early involvement from our design team through our “Project Assist” scheme will allow the most practical application to be decided and offer comprehensive experience from the outset to ensure the maximum benefit for all stakeholders.

Britframe “Post and Rail System”

The Britframe post and rail systems sometimes referred to as a Liner system, is the simplest form of providing a pitched alternative to a troublesome flat roof. The system is dependant of transferring the load of the new roof structure at regular load points typically on a grid basis with a maximum span of 1.0m x 1.0m. As with the propped rafter systems the post and rail system is fixed directly into the exiting roof deck. This system is both simple to install, and a cost effective over roofing solution for the tightest of project budget requirements.

Generally sat onto a continuous angle base spreader positioned either parallel to or at 90 degrees to the new roof purlins, dependent upon existing roof construction.  The Britframe Post and Rail system can accommodate a maximum new roof height of 3.5m. With new roof pitch up to a maximum roof of generally 15 degrees. Specific projects may vary. Roof purlins to be positioned at centres, down slope, to suit spanning capabilities of the new roof covering.