A wooden house under construction with scaffolding, surrounded by a blue sky with clouds, and a truck parked nearby.

Our Building System

Our building system has been developed using a twin wall Larsen Truss panel with metal web joists for the roofs & floors.

Our building system conforms to passive house standards. To learn more about passive house click here.

Key features of our build system:

  • Ply webs to eliminate thermal bridging

  • Metal web joists to save on material

  • High levels of recycled insulation

  • Super airtight building fabric

  • Sustainably sourced materials

  • Offsite construction

Our panels are constructed offsite in our workshop by our carpenters and joiners and then installed on your plot within a few days. Offsite manufacture in a quality controlled environment reduces any delays caused by weather and reduces waste.

Metal Webbed Joist Roof
& Intermediate Floor

Construction site with stacked wooden beams and building framework under a cloudy sky, surrounded by trees.
Learn more about roofs and floors

Twin Wall Larsen Truss Panel

Interior of a building under construction with exposed wooden roof trusses, green walls, a window opening, and scaffolding.
Learn more about walls

Warmcel Cellulose Insulation

Worker in a yellow safety vest kneeling on a gravel surface, using construction equipment, with large bags of insulation material labeled "Warmcel" stacked nearby and a building under construction with scaffolding in the background.
Learn more about insulation
Stacked wooden construction materials and metal brackets at a construction site, with trees and old buildings in the background.

Metal webbed joists offer the versatility of timber with the strength of steel. Designed and manufactured to suit each project, the open web design creates a service void allowing services and pipework to be easily installed.

The steel webs create a super strong joist, allowing a greater span than alternatives. This reduces the need for load bearing walls or steel beams.

Metal Webbed Joist Roof & Intermediate Floor

A diagram of wall insulation layers, including breathable membrane, external breathable board, fully filled warmcel cellulose insulation, plywood web, stud layers, service zone with 25mm battens, internal airtight board, and internal finish.

Passive standard Twin Wall Larsen Truss Wall

A Larsen Truss is a twin wall construction used to create a deeper wall space to hold more insulation. Our Larsen Truss build system reduces thermal bridging, has recycled newspaper cellulose insulation and creates an energy efficient building which conforms to passive standards.

The Broadaxe Timber Frame wall consists of 140/90mm inner load bearing studs & 90mm outer studs connected with plywood webs and fully filled with Warmcel. The frame is boarded externally with a breathable Meditvent board and breathable membrane. Internally, we use airtight Smartply Pro Passive board taped at junctions to ensure an airtight seal. We offer a choice of wall depths to achieve desired U-values:

  • 400mm - 0.09 W/m²K U-Value

  • 350mm - 0.11 W/m²K U-Value

  • 300mm - 0.13 W/m²K U-Value

Worker in safety vest operating a power saw at a construction site with lumber and insulation materials

Warmcel Cellulose Insulation

Warmcel Insulation is a high performance insulation for timber framed buildings, manufactured using recycled newspaper & natural boron salts. Using all natural ingredients Warmcel is an eco friendly alternative to conventional insulations.

Warmcel fills timber frame panels completely, to a high density with no gaps increasing airtightness levels by up to 30%, creating a stable temperature throughout the year. Being breathable and resistant to fire, mould & pests, Warmcel is perfect for a healthy home.

Warmcel is suitable for multiple applications:

  • Roofs

  • Lofts

  • Floors

  • Walls

As well as using Warmcel in our timber frames we are also a national installer of Warmcel. If you would like to contact us about Warmcel in your own project (new or retrofit) please enquire below.

Find out more at www.warmcel.co.uk

Enquire about Warmcel