Unless they have been recycled from a previous use, concrete and terracotta roof tiles are high in embodied energy, and increase a building’s environmental footprint. Roofs may absorb or reflect heat and impact on thermal efficiency, depending on the material. Acceptable roofing materials include lightweight sheet roofing, earth or other media for green roofing, and recycled concrete and terracotta tiles. The use of newly manufactured concrete or terracotta tile is not acceptable.

External wall finishes can contribute significantly to the environmental impact of a home. Specialist finishes such as aluminium, stainless steel, copper or similar materials can be very greenhouse gas intensive in their manufacture, so are generally acceptable only where needed in small quantities. Render finishes on a polystyrene substrate have some thermal benefits, but have poor durability and limited recyclability, so avoid this material and finish where possible.

Suitable materials include:

  • locally manufactured face concrete blockwork.
  • natural stone (must be locally sourced where practicable).
  • bricks (must be locally sourced and/or recycled if practicable).
  • rammed, pressed or puddled earth.
  • natural or pigmented cement render.
  • rough sawn or dressed timbers with high durability.
  • plywood cladding.
  • timbers finished with clear or pigmented oils, or left to weather naturally.
  • in-situ concrete (subject to it satisfying Requirement R28).
  • lightweight steel sheet.
Mullum Creek clay products guides

Clay Products Guide (05/05/17)