Permalayer is an anti-fracture underlay designed for use over timber as well as green and cured concrete slabs and screeds.

The unique Permalayer system enables fractures up to 3mm wide to be bridged without affecting the tiled finish. When used correctly Permalayer removes the need for costly floor build-ups such as plywood overlays. The layer enables the substrate beneath to move laterally, protecting the tiled finish from the detrimental effects of subfloor movement. A solid bed can also be achieved due to the flat nature of the underlay eliminating the problems associated with point loading.

Permalayer is suitable for use in conjunction with floors incorporating heating pipes.

  • Timber/metal floors & areas with limited movement  
  • Green screeds & concrete  
  • Fracture resistant up to 3mm  
  • Underfloor heating  
  • Waterproof when used with Norcros Waterproofing Admixture
  • 1.8mm thick  

2 Roll Sizes
0.5m x 8m (approx. 4m2 )
1.2m x 16.5m (approx. 20m2 )

Cut the Permalayer to the required size. Apply Norcros Rapid Porcelain Grey to the substrate using a thin bed notched wall trowel. Lay the Permalayer onto the adhesive bed, roll and press flat until the adhesive appears through the surface. Allow the adhesive to dry. Lay the tiles normally using Norcros Rapid Porcelain or Thick Bed Stone & Porcelain Adhesive. Joints between the tiles must be minimum 3mm wide. Allow the adhesive to dry prior to grouting using Norcros 4 into 1 or Norcros Flexible Wide Joint Grout. Permalayer does not eliminate the need for movement joints which should be incorporated in the tiled installation in accordance with BS 5385: Part 3. In wet areas such as shower and wet rooms, mix Norcros Rapid Porcelain Tile Adhesive with Norcros Waterproofing Admixture to give a tanked installation.