Eco-Cavity - Full Fill Cavity Wall Insulation

Eco-Cavity Full Fill insulation boards are suitable for full filling cavity walls with PIR insulation. They allow users to optimise the full cavity with high performing thermal insulation, meaning u-values and Building Regulations can be met without altering standard construction designs.  Eco-Cavity Full Fill prevents the need to increase cavity space and overall wall width to accommodate larger thicknesses of traditional insulation materials.

The board's tongue and groove edges ensure a continuous layer of insulation, increases protection from wind driven rain and also aids installation.


Suitable for full fill cavity wall applications, whilst maintaining a residual 10mm cavity. Eco-Cavity Full Fill is high performance insulation, and provides a cost effective means of reducing CO2 emissions and achieving compliance with Building Regulations / Standards.
Maintaining a residual 10mm cavity helps resist moisture transfer, aids installation and accommodate mortar squeeze.


EcoTherm Eco-Cavity Full Fill comprises a fibre free rigid polyisocyanurate (PIR) insulation core with tongue and grooved edges, faced with aluminium foil composite on both sides.  The boards are conveniently sized to co-ordinate with brick and block dimensions and allow the insertion of wall ties at the appropriate spacing. 

Standard Dimensions

Length: 1200 mm
Width: 450 mm
Area: 0.54 m2
Standard thickness: 90, 115 & 140mm

Thermal Performance

The thermal conductivity (lambda / λ value) of Eco-Cavity Full Fill is 0.022W/mK 

Detailed product and application information are provided on the Eco-Cavity Full Fill datasheet.

Eco-Cavity Full Fill benefits:

  • BBA Certified
  • 0.18 W/m2K U-value easily achieved in a 100mm cavity wall without altering standard construction design
  • Easy and quick installation with specific boards sized to combine accurately with standard sized bricks/blocks and tongue and grooved edges
  • Will not rot, sag or decay
  • Offers excellent thermal resistance in practical thicknesses
  • Tough, light and easily fitted using standard wall ties or simple clipping methods
  • Helps easily achieve UK Building Regulations/Standards