One of the key aspects of a product’s environmental impact is its durability. This is expressed in terms of anticipated life until renewal. In financial terms it is the period over which the depreciated initial capital cost and annual maintenance cost do not exceed the annual cost of a replacement roof. Cheap low quality roofing systems can be a false economy as they need repeated renewal, which has a repeated impact on the environment. The durability of all roofing materials is dependent on the roof design, installation, immediate environment, maintenance and use. Other specific factors assessed by the British Board of Agrément (BBA) relating to the durability of individual products include formulation, thickness, and life to first maintenance.


The British Board of Agrément (BBA) assess the durability of single ply roofing membranes as part of the Agrément Certification process. Single ply membranes are typically given a life expectancy of:

  • “at least 25 years”
  • “in excess of 25years (Sarnafil TG/TS has this)
  • "at least 30 years”
  • “in excess of  40 years” (Sarnafil G/S has both)


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