Breather Membrane

High performance breather membrane, made from high tensile spun bonded polypropylene layers, around a micro-porous polypropylene film.
Designed for use in a fully supported or unsupported tiled, slated or metal roof system. 
Superior moisture vapour permeability is achieved whilst maintaining the highest levels of water resistance.

The high vapour permeability and waterproof nature of the membrane, combined with excellent tensile/tear strength, make Cromar an ideal product for use in both warm and cold roof applications.
It is equally suitable whether draped unsupported over rafters or laid directly over insulation.
It will allow the escape of water vapour from within the roof structure whilst protecting against wind driven rain, snow and dust which may penetrate the main roof waterproofing, providing a permanent quality breather underlay, which will last the life of the roof construction.


  • Three Layer Membrane
  • Clean and easy to use
  • Lightweight and Flexible
  • Excellent tensile and tear strength
  • Waterproof Membrane
  • Long Term Durability
  • UV Stable (4 months exposure)
  • Warm and Cold Roof Application
  • No additional ventilation required