Window frame extension elements for wooden and wood-metal windows



  • Moisture-resistant
  • Thermal insulation values up to 0,2 W/m²K
  • Airborne sound insulation values up to 28 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 Plywood panel AW100
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 moisture-resistant Frinorm frame extension elements are the right choice, especially when high levels of moisture resistance and thermal insulation are required. They are available with untreated plywood panel AW100, plywood panel AW100 with primer foil or plywood panel AW100 with real wood veneer in all types of wood. PUR rigid foam, 32 kg/m3, is used as standard for thermal insulation. Other types of thermal insulation, such as expanded polystyrene rigid foam with graphite additive (EPS lambda), glass wool or cork, are also available. The window frame extension elements are fabricated with a circumferential spruce pine edge band. Special edge bands can be inset according to your requirements. 

Test reports (PDF)