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Without a drainage cavity.

Some insurers require a minimum drainage cavity behind the render protected insulation system. For all other building types the insulation may be fixed directly to the sheathing board.



  • Internal lining
  • Lightweight Steel Studs
  • SPSenvirowall Fabrock271
  • Cement Particle Board
  • 3mm-5mm Envirobed Adhesive Mortar
  • Rockwool or EPS with mineral wool fire breaks
  • 3-5mm Envirorend Basecoat incorporating
  • Plastic coated glass fibre reinforcing mesh
  • Silicone or Acrylic primer
  • Envirosil or Envirocryl Top coat


  • Minimum U-Value 0.15 - 0.35 W/(m2K)


  • Minimum sound insulation RwdB 45 - 55dB sound reduction


  • 30 - 90 minutes fire resistance

Typical System Build Up

  1. Lightweight Steel Frame
  2. Internal Lining
  3. SPSenvirowall Fabrock 271
  4. Cement Particle Board
  5. Adhesive Mortar 3-5mm Envirobed high polymer adhesive. Applied with 8mm tooth trowel.
  6. Rockwool Fire Break 1000mm x 200*mm. Rockwool insulation slabs. Fitted with two mechanical anchors per board.
  7. Mechanical Fixing Type and length determined by on site tests
  8. EPS FRA Polystyrene or Rockwool DD Insulation
  9. 50mm* 1000mm x 500mm. Mechanically fi xed.
  10. Reinforced Base Coat Apply Envirorend high polymer base coat, minimum 3-5mm, with 8mm tooth trowel incorporating glass fibre reinforcement mesh.
  11. Primer & Top Coat 1.5-3mm grain Envirosil/Envirocryl finish. Trowel applied, thickness determined by grain size. Available in different textures.
  12. Concrete Floor Slab With 20mm Rockwool fire stop.

* Please contact our technical department for advice on insulation thickness, U-value and condensation calculations.

For technical information about Wall System 1 Direct to CP Board, please click on the download link below or alternatively, you can visit our Technical Resources page.