ULTRA

Featured Image: Green Building Store ULTRA triple glazed timber door

Triple glazed timber entrance doors, with insulated frame option,  for low energy & Passivhaus projects. U value as low as 0.56 W/m2K

  • Inward and outward opening entrance doors
  • FSC® timber in redwood & oak
  • Insulated frame option
  • 98 mm profile
  • Complements the Passivhaus certified ULTRA window range
  • Made exclusively for Green Building Store by our partners in northern Europe



Glazing & U values

Glazed door:

Whole door UD: 0.79 W/m2K Redwood

Whole door UD: 0.89 W/m2K Oak

Glazing U value Ug: 0.52 W/m2K

Triple unit: Argon fill 52 mm

Light transmission value: 74.1%

Boarded door:

Whole door UD: 0.56 W/m2K Redwood

Whole door UD: 0.67 W/m2K Oak

Panel U value: 0.22 W/m2K (VIPs insulation)

Lower U value options available with ULTRA insulated frame version


Typical maximum sizes

Width: 1250 mm

Height: 2300 mm

Please see some sample styles below. If you can’t see the style you’re looking for, please get in touch, as everything we do is bespoke and made to your requirements.

Please note: Door panel options include standard flat, grooved or raised and fielded.







Provided by NBS

Affiliations & Accreditations