Joisties | Steel Underfloor Insulation | About

ecoMaster’s Joisties provide an innovative solution for insulating steel framed floors and keeping your home comfortable.


  • 100% polyester fibre.
  • Heat bonded, with no binding chemicals.
  • Free from formaldehyde or glues.
  • Do not hold moisture.
  • Not affected by mould or mildew.
  • Resistant to rodents.
  • Non-flammable – comply with fire regulations.
  • Can be cut to fit using a sharp utility knife.
  • Simple to install.
  • Manufactured in Australia.


  • One of the highest rated underfloor insulation solutions for steel framed floors.
  • A simple, cost-effective solution.
  • Non-irritant, non-toxic and non-respirable.
  • No itchy glass fibres in your skin, eyes or lungs.
  • Creates a steel frame thermal break under every joist.
  • Can be used on box sections, C section floor joists and C section steel beams.
  • Effectively blocks cold and hot underfloor draughts.
  • Keeps floor temperatures comfortable in winter and summer.
  • Helps to improve your home’s thermal efficiency.
  • Suitable for enclosed and open sub-floors.
  • 50-year durability warranty.