Flat Roof Detail

Trusses and Joists from MBC

Flat Roof 

The Flat Roof is a roof system that provides an almost level roof configuration in contrast to the many sloped roofs. As with the Cut / Vaulted Roof Joists the MBC flat roof system utilise open metal web posi joists which sees parallel timber flanges that are plated together with a engineered steel web component. The steel webs are plated in a ‘V’ formation, providing a lightweight structural flat roof joist that can span greater distances in comparison to a standard solid joists. Insulation is fitted by MBC within the flat roof structure with the insulation located in between the posi joists.

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Flat Roof 0.14 W/m2K U-Value

All items supplied and fitted by MBC

  • 50mm min firring piece
  • 11mm OSB3 Deck
  • 300mm Cellulose Insulation
  • Engineered MiTek posi joists at centres specified by structural engineer
  • VCL / Airtight Membrane to achieve below 3.0 AC/HR or better
  • 25mm Service Cavity Batten
  • *Minimum 50mm firring pieces required to ensure ventilation to insulated flat roof system

    Click image to expand

    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 3.0 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 Passive Timber Frame and High Thermal Efficiency Timber Frame Homes throughout the UK, for people looking to benefit from huge energy savings and reduce their heating demands by up to 90%.

      Passive Builds

      Precisely engineered Passive solutions from MBC Timber Frame requiring 90% less energy for space heating and cooling.

      Near Passive Builds

      MBC Timber Frame’s “optional levels of insulation” applied to a 140mm stud frame. 3 great options delivery differing U-Values.

      Groundworks

      The MBC Passive Foundation system, suitable for both Passive and Standard timber frame projects.

      Truss and Joists

      Metal web Joists and Roof Trusses available on a supply only basis for traditional build projects.

      A super insulated, draft free home, providing exceptional energy efficiency

      Designed and engineered in accordance with current building regulations

      Manufactured in a controlled factory environment, ensuring superior quality craftsmanship,

      An affordable, competitively priced building option.

      Erected on site at an unparalleled rate when compared to conventional block construction

      An environmentally conscious and forward thinking sustainable approach