Protect your home, use the Premium Flat Roofing Products

DCR & Sons, based in the Surrey and South London areas, are experts in the installation and maintenance of Sarnafil, Alwitra and Rubberbond premium flat roofing products.

We install and maintain Sarnafil, Alwitra and Rubberbond products in Epsom, Kingston, Tadworth, Stoneleigh, Cobham, Banstead and all other towns throughout North Surrey and South London.

Premium Roofing Products


Premium Roofing Products


Premium Roofing Products


Premium Roofing Products




One of the properties of thermoplastic membranes is that the material temporarily changes from a solid to a semi-solid state when heated sufficiently, enabling the sheets or panels that are overlapped to be fused together and return to a solid upon cooling. Thus, a monolithic, continuous sheet membrane is created.

Sika roofing's specially formulated thermoplastic membrane is also designed to withstand the everyday occurrences of ponding water and other natural elements such as birds, biological organisms, pollution, wind, hail and snow.



"Vinyl" is the shortened term for "polyvinyl chloride". Vinyl, or PVC as it is more commonly referred to, is a molecule comprised of carbon, hydrogen and chlorine (taken from salt). It is the most well-known of the available thermoplastic roof membranes. Vinyl membranes for roof applications were first developed in Germany and Switzerland in the early 1960s and arrived in North America in the 1970s. Today they have the longest track record of any thermoplastic roof membrane and continue to gain in market share.

Besides the important feature of heat-welded seam technology, Sika Roofing's PVC membranes offer many other benefits including:


  • Proven performance history of over 45 years
  • Good low-temperature flexibility and high-temperature tolerance
  • Inherently fire resistant
  • Highly puncture and impact resistant
  • Easy to repair
  • Available in a spectrum of colors including energy efficient reflective white
  • Proven durability against rooftop soiling and contamination
  • Installation friendly and installed by a variety of attachment methods
  • Aesthetically appealing, and can be used to create the look of standing seam metal
  • Provides excellent visual feedback of workmanship during and after installation


Sika roofing has 50 years of vinyl membrane manufacturing expertise. While other manufacturers may have "new and improved" membranes, we believe that this simply means "new and unproven". Proven performance of any roofing or waterproofing membrane using the same formulation, whether it be PVC or TPO (thermoplastic polyolefin), is the key to making a wise, long-term decision.


With a life expectancy in excess of 25 years, Alwitra® Evalon single-ply polymeric membranes are suitable for all types of flat roof construction. The roofing membrane remains permanently flexible, is bitumen compatible and is available in a range of colours.

Alwitra membranes are suitable for both new build and refurbishment projects and can be fully bonded, mechanically fastened or loose laid and ballasted.

  • Fully bitumen compatible and compatible with all insulation boards
  • User-friendly and quick and simple to install.
  • Heat or solvent-welding effectively provides seamless roof coverings.
  • Membranes remain permanently weldable.
  • Smooth surface that does not retain dirt.
  • Light colours promote good solar reflectivity.
  • Excellent mechanical properties due to high strength and elongation.
  • Resistant solar radiation without protective coatings.
  • Suitable for the use under paviours or other load spreading layers (e.g. car parks), and roof gardens.
  • Self-extinguishing and comply with all regulations for fire resistance.
  • Resistant to Chemical pollution in the environment.
  • Compliant with DIN EN ISO 9001 – Quality Management System.
  • Resistant to root penetration (can be used in roof gardens without the need for separate root resistant membranes).
  • Low vapour diffusion resistance (trapped moisture can escape through the membrane without causing blisters).
  • Can be recycled.

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