Passive Roof

Passive Roof Systems | MBC Timber Frame

All MBC Passive Roof Systems deliver a U-Value of 0.10W/m2K. The main diagram below shows how the three Passive elements (Roof, Wall and Foundation) link together.

The individual roof type diagrams show the detail associated with each roof type: Fink Truss, Attic Truss, Vaulted Roof and the Flat Roof.

Vaulted Roof 0.10 W/m2K U-Value

All items supplied and fitted by MBC

  • 25mm x 50mm Counter Batten
  • Roof Membrane
  • 400mm Rafter
  • 400mm Cellulose fitted to sloped portion of engineered cut rafter
  • VCL / Airtight Membrane to achieve below 0.6 AC/HR or better
  • 25mm Service Cavity Batten 

Fink Truss Roof 0.10 W/m2K U-Value

All items supplied and fitted by MBC

  • 25mm x 50mm Counter Batten
  • Roof Membrane
  • Roof Truss
  • 400mm Cellulose Insulation to flat bottom chord portion of truss
  • VCL / Airtight Membrane to achieve below 0.6 AC/HR or better
  • 25mm Ceiling Service Cavity Batten

Attic Truss Roof  0.10 W/m2K U-Value

All items supplied and fitted by MBC

  • 400mm Cellulose Insulation to sloped portion of truss
  • 25mm x 50mm Counter Batten
  • Roof Membrane
  • Attic Truss
  • VCL / Airtight Membrane to achieve below 0.6 AC/HR or better
  • 25mm Ceiling Service Cavity Batten
  • 22mm Caberdek Flooring

Flat Roof  0.10 W/m2K U-Value

All items supplied and fitted by MBC

  • 50mm min firring piece
  • 11mm OSB3 Deck
  • 400mm Cellulose Insulation
  • Engineered MiTek posi joists at centres specified by structural engineer
  • VCL / Airtight Membrane to achieve below 0.6 AC/HR or better
  • 25mm Service Cavity Batten
  • *Minimum 50mm firring pieces required to ensure ventilation to insulated flat roof system

Discuss your project with us!

MBC specialise in the production of Timber Frame Passive House Buildings and High Thermal Efficiency Timber Frame Houses throughout the UK, Fulfil your dream of a self built home and benefit from huge energy savings and reduce their heating demands by up to 90%. 

MBC specialise in the production of Timber Frame and Passive Houses available throughout the UK, to clients looking to benefit from huge energy savings and reduce their heating demands by 90%.

Our super insulated, precision engineered timber frame homes are at the forefront of innovation and design – all at an affordable cost. Perfect for you keen self builders.