Window frame extension elements for wooden and wood-metal windows



  • Thermal insulation values up to 0,2 W/m²K
  • Airborne sound insulation values up to 33 dB
  • All types of real wood veneers available
  • Circumferential wooden edge band
  • Good mounting options
  • Retain their shape and dimensions
  • Problem-free surface finishing





The following services are included in the square metre price:

  • Preassembled, custom-made according to the desired length, width and profile thickness
  • Four-sided counter profile work, tailored to your frame or threshold profile
  • Circumferential solid edge band
  • Delivered picked to order
  • No waste, machine, labour and storage costs


The following additional services can also be commissioned:
  • Edge banding possible
  • Additional wood inserts freely selectable
  • Special processing such as cut-outs, round and segment arches, ventilation slots or surface grooves are also possible
  • Special designs possible



Product description:


Surfaces Untreated, priming film, real wood veneer
Cover panels Chipboard  P5, E1, MDF board P3, E1
Insulation PUR rigid foam, 32 kg/m³
Edge band Spruce pine
Thickness 40 to 99 mm
Sizes 500 x 95 to 3588 x 1294 mm


The Frinorm standard frame extension elements are especially suited for high thermal insulation requirements. They are available with chipboard P5, E1, untreated, chipboard P5, E1, with primer foil, medium-density fibreboard (MDF) P3, E1, with primer foil or chipboard P5, E1, with real wood veneer, available in all types of wood. PUR rigid foam, 32 kg/m³, is generally used for thermal insulation. Other types of thermal insulation, such as expanded rigid polystyrene foam with graphite additive (EPS lambda), glass wool or cork are also available. The frame extension elements are fabricated with a circumferential spruce edge band, or an edge band only on the long sides. Special edge bands are inset according to your requirements.