Window frame extension elements for wooden and wood-metal windows
sound insulation



  • Thermal insulation values up to 0,3 W/m²K
  • Airborne sound insulation values up to 43 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 Glass wool, 20 kg/m³
Sound insulation Heavy bitumen foil
Edge band Spruce pine
Thickness 40 to 99 mm
Sizes 500 x 95 to 3588 x 1294 mm


The Frinorm sound insulation frame extension elements are the right choice especially for high demands on sound insulation as well as high demands on thermal insulation. 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 in all types of wood. Depending on the sound insulation requirements, the frame extension elements are fabricated with one or two heavy bitumen foils. Glass wool, 20 kg/m³, is used for thermal insulation. The window frame extension elements are fabricated with a circumferential spruce edge band. Special edge bands can be inset according to your requirements.