Technical summary of Lacuna bi-fold doors specifications
Quick summary of specifications incl. profile dimensions, materials, insulation, maintenance requirements, air permeability, water tightness and security.
Lacuna bi-fold doors, Lacuna bifold doors, Lacuna doors, Lacuna UK and Ireland, bifold doors, bi-fold doors, folding doors, patio doors, passivhaus, passive house, passivehouse, insulation, low u-value, low maintenance, timber, slim frames, high performance
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bi-fold doors


  • Danish design and manufacturing
  • Bespoke for each individual project (up to 2.7m’s height and 6m’s width)
  • Top hung design uses no guide rail and makes threshold cleaning easy
  • Slim profile; 56mm per door frame gives a maximum frame – to – framewidth of 117 mm
  • Use of FSC® certified hardwood (oak, mahogany and heat treated beech*)
  • Superb Insulation – U-values typically from 0.9 W/m² K
  • No need to repaint the beech for 20-30 years in normal conditions dueto the heat treatment*
  • Air permeability EN 12207 – Class 4 at +/-600 Pa
  • Watertightness EN 12208 – Class E1200
  • Security tested to EN1627-30 / PAS24
  • Use of highest marine-grade acid-free brushed stainless-steel handles and hinges (316-A4) to prevent rusting in even harsh seafront locations. All ironmongery follows a strict principle of 18mm
  • Precision manufacturing by use of advanced five-axial CNC-machines
  • Every product is checked and provided with an approval number
  • Lead time usually 5-7 weeks from order to delivery, and the doors can be installed in a few hours