NBT Diffutherm - Steel Frame

Diffutherm Outline

NBT's Diffutherm System is for light steel buildings externally finished with render.

NBT Diffutherm systems use woodfibre boards over the outside of the frame in a continuous, external insulation layer.

Externally a mineral based thin render system is applied directly to the woodfibre boards. Over 200 light fast colours are available in a variety of finishes, including high impact render coats.

The air tightness layer is on the inside of the frame and it is optional whether to install a service void on the inside of this layer for easy service alterations.

System Benefits
  • Excellent thermal performance, with very low thermal bridging compared to steel frame
  • Very cost effective
  • Excellent air tightness
  • Excellent acoustic insulation
  • Excellent overheating control
  • Robust and easy system to install
  • Fully breathing construction
  • Full design and site support from NBT
  • Tried and tested system, fully certified

System Application

Pavatex Diffutherm

NBT Diffutherm system on steel frame is a cost effective, high performance and sustainable option. Ideal for schools, offices, warehousing and public buildings, it offers speed and simplicity.

The inclusion of a racking board on the inside of the NBT Diffutherm system can have many benefits - in this system it is used as an air tightness layer as well as mounting for the services.

With certain cladding materials, multi occupancy applications require fire stops between units in the external cavity. Contact NBT for further details.

Click here to download a printable PDF of this system

Environmental Performance
fsc certified natureplus certified
  • Carbon positive (locks up more than is used) and non toxic
  • Woodfibre Boards are over 95% waste
  • FSC Certified source
  • Zero Landfill - recyclable, compostable or used for thermal energy production
NBT Diffutherm Performance

Pavatex Diffutherm

NBT Diffutherm Components
  • Insulation boards: Interlocking, waterproof, interlockingDiffutherm boards in 40, 60, 80 and 100mm .
  • Pavatape for exposed edges, and a selection of air tightness details for internal junctions
  • Fixings: A range of helical and screw fixings for different boards and roofing materials
  • Infill insulation: NBT provide natural insulation materials such as NBT hemp, Thermafleece and through sub-contractors cellulose
  • Plaster boards and paints: NBT can provide clay boards, plasters and trade environmental paints for ceilings

For more information, download the following. Please right click and 'save as'. If you have any problems downloading any information, please contact us for assistance:

NBT Diffutherm Steel Frame Basic Information Sheet

NBT Steel Frame Full Technical Manual for Designers and Installers.

NBT Woodfibre Systems Fire Performance

Pavatex Systems LANTAC Certificate

Pavatex ISO 14001 Certificate