Now certified by the Passive House Institute.

Passive sills provide superior window sills and over sills to the construction and external insulation industries. Passive Sills are produced from high density expanded polystyrene and coated with our Passive Sills polymer resin.

      • Eliminate Cold Bridging
      • Lightweight
      • Easy to install
      • Available up to 3.6m in length
      • Traditional appearance
      • Can be painted
      • For all types of construction – ICF, timber frame, block build, external insulation
      • Easy to repair

Passive Sills can be retrofitted to existing window sills making them the ideal choice for external insulation contractors, or can be used in new build and can be fitted to the most awkward windows.

Companies & Organisations That Use Our Products