• Approved


  • PM Design
  • Manufacture
  • PM Construction


  • The PYC Construction Panelised Timber Frame Building System

Description of the PYC Construction Panelised Timber Frame Building System

The PYC Construction Timber Frame Building System can be supplied as ‘turnkey’ system in which internal and external finishes, fittings and fixtures are designed, supplied and erected on site by PYC Construction, or panels can be supplied and erected on a pre-prepared sub-structure constructed by others and finishing by others. This assessment does not include external wall cladding and roof finishes. Internal finishes are included where these are fitted by PYC Construction only.

Durability Assessment: minimum 60 years

Limits on scope

  • Maximum 3 storeys for residential or commercial use.
  • Bottom members minimum 150mm above external ground level.
  • Where suspended ground floors are used, a minimum of 1500mm2/m of external wall, or 500m2/m2 of floor area sub-floor ventilation must be provided.
  • Where suspended timber floors over a void are proposed, the ground must be sealed to minimise moisture entering the void, e.g., damp proof membrane + 50mm site concrete, in accordance with Building Regulation requirements. If the floor void is below external ground level at any point, drainage may have to be considered. Standing water in the void is not permitted.
  • Masonry wall cladding must have a minimum 50mm ventilated back cavity.
  • Non-masonry uninsulated wall cladding must have a minimum 25mm drained and ventilated back cavity, or as required by the manufacturer (a wider cavity may be required if an open-jointed rainscreen system is used, for example).
  • Insulated render or insulated brick slip wall cladding system must have a minimum 15mm drained and ventilated back cavity.
  • Where different forms of cladding are used, structural and thermal/hygrothermal checks must be undertaken to ensure the durability of the system is not affected.
  • PYC Construction must be contracted for the design, manufacture, supply and erection of the structure.
  • A chartered structural engineer suitably experienced in the design of this type of structure must undertake the structural analysis and design.
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