Direct Roofing is fully Registered Contractor for the supply & installation of Sika® Sarnafil® single ply PVC roofing systems.

Single ply membranes have been used for many years  on commercial projects but their high performance means they have become increasingly popular for domestic roofs. The Sarnafil membrane is particularly capturing the imagination of homeowners looking for a good looking, high performance, alternative to traditional flat roofing materials.


Sarnafil roofing membranes are very versatile and ideal for almost any kind of roofing project. The membranes are manufactured in Switzerland to ISO 14001 and have a managed impact on the environment. Sika Sarnafil operate a stringent quality control programmes to ISO 9001.

Vancouver Commercial Roofing

Liquid-applied membrane (LAM) is a monolithic, fully-bonded, liquid-based coating suitable for many waterproofing and roofing applications. The coating cures to form a rubber-like elastomeric waterproof membrane and may be applied over many substrates, including asphalt, bitumen and concrete.

  • Ideal for exposed roofs with large number of complicated details and penetrations
  • Cost-effective, especially for roof renovations and roof repair projects
  • Seamless, fills in cracks, gaps and voids in substrate
  • Easy and safe application
  • Durable
  • Rapid curing and excellent adhesion to all kinds of surfaces
  • Applicable for a multitude of waterproofing needs, not only roofs

Typical Application Fields for Liquid-Applied Membranes



Below-Grade Structures



Bridge Decks

Tank Lining

Wet Rooms

Life expectancy

The Sarnafil single ply membranes, fitted by Roof Assured by Sarnafil approved installers, have been independently assessed by the British Board of Agrement (BBA) to have a life expectancy* in excess of 40 years (*in their opinion)


The Sarnafil single ply membrane can cope with standing /ponding water without detriment to the product or, with the guarantees.

Wind uplift

The membrane is secured and adhered to the roof structure so offers maximum protection from wind uplift. Sarnafil takes full responsibility for wind calculations on projects over 100m2


The Sarnafil membrane is thermally and dimensionally stable.  Its performance is unaffected by expansion and contraction, but also protects against damaging solar rays. The Sarnafil membrane is also vapour permeable to prevent blisters.


Sarnafil membranes have a unique lacquered top coating providing better resistance to industrial/biological waste and air pollution.

Resistant to root growth

Membranes are resistant to root growth, making them suitable for use under green roofs.

Fire retardant

The membranes are treated with a fire retardant and are self extinguishing and can be used to gain relevant Building Regulations approval.

Installation times

With the new Sarnafil self adhered membrane, installation times on large projects can be reduced considerably.


The Sarnafil membranes are virtually maintenance free and carry an insurance backed guarantee from the manufacturer that should any product supplied by them fail, will not just be replaced, but will also cover the installation cost of those replacements.


All laps, joints and details are permanently welded for maximum strength.  Steel reinforced details and a unique seal cope with building movement and guarantees a waterproof wall joint, that will not crack or fail like traditional mortar, lead or sealant. Sarnametal (PVC coated) steel reinforced edge trims are mechanically fixed to form a solid, storm resistant roof edge.  The Sarnafil membrane is fusion welded to the Sarnametal trim to permanently seal the roof edge.

Flame Free

Sarnafil membranes are cold applied and free from naked flames. They are also homogenous which, when hot air welded form joints which are stronger than the membrane itself.