Derwent Roofing Services Ltd has been trading since 1999, fitting only Sarnafil systems. The Directors, Simon Byrne and Scott Henshaw, have 40 years combined experience in the installation of single-ply systems and Simon worked for Sarnafil, for 8 years, as a Field Technician responsible for final inspections and training. All our operatives hold NVQ Level 2, Applied Waterpfroof Membranes certification and Construction Skills Certification Scheme (CSCS) certification and the company is SMAS and Construction Line accredited.

Sarnafil is a relatively expensive system compared to the old bitumen and felt system but, like the original asphalt; it is the best system available at this time. A Sarnafil system will be watertight for 40 years plus – the British Board of Agrément has independently tested Sarnafil membranes to last in excess of 40 years and there are numerous Sarnafil roofs worldwide that have been in service for over 40 years. The finished roof will carry a 15 year guarantee.