Steel Frame System

Steel Framing System is a fast structural system designed for the construction of panel and continuous walls, low-rise individually standing buildings and high separating walls.

Non Combustible

Light gauge steel frame is suitable for use in multi-storey developments including roof top boxes.  Due to the costly fire proofing needed on timber frame to comply with Part B fire regulations, light gauge steel frame is often more economical.


light gauge steel frame is up to 40% lighter to timber frame allowing for larger roof top extensions to be accommodated by the existing load bearing walls and foundations.

Dimensionally Stable

Light gauge steel frame does not warp, expand or shrink which often plagues timber frame constructions - especially when installed over winter.  Light gauge steel frame avoids the need for expensive movement joints in the render and cladding or the extra expense of 'packing out' warped timber frame structures.


Light gauge steel frame is fully recyclable and can be factory cut to size allowing for virtually no waste or skip costs.

Quick Build

Light gauge steel frame structures can be supplied in pre-assembled and sheathed panels allowing for a roof top box to be completed in as little as two weeks.


Light gauge steel frame in a warm frame environment has a predicted design life in excess of 250 years.

Fully Tested & Certified System

We only work with fire tested, NHBC approved and BOPAS accredited system manufacturers.

Renderline Limited offers an obligation free quotation and technical review for roof top box developments. Architectural drawings and a structural engineer's survey would be required for an accurate quotation.