Motor vehicle emissions contribute to air pollution and are a major ingredient in the creation of smog in some large cities. In recent years, the Chinese government has placed stricter control on vehicle emissions by setting tighter emission standards and encouraging the development of new clean energy vehicles. In Hangzhou, a plant to produce clean energy buses is under construction. Sika, as a supporter of sustainability and environment protection, provides an energy-efficient roof system.

Proven membrane performance

The new plant of Hangzhou Yangtze Auto Co., Ltd. will have an annual production capacity of 20,000 electric clean energy buses. It is expected that the annual automobile productivity will reach a total of 260,000 vehicles after the completion of the construction works. Sika is committed to provide environmentally sustainable and energy efficient solutions.

In total, this roofing project has to consider an area of over 200,000 m2. The roof system of the assembly work shop is designed with the steel structure, PE vapor control layer, rock wool insulation layer and PVC waterproof membranes from the bottom to the top. The Sika Sarnafil S 327-15 L PVC waterproof membrane in white colour is excellent in UV resistance with high solar reflectivity. This helps to maintain low indoor temperatures during summer and subsequently to reduce indoor energy consumption.

The PE vapor control layer reduces condensation risk of roof structures, effectively resists indoor air pressure and reduces the total wind load. The combination of the rock wool insulation layer and vapor barrier provides effective heat insulation and anti-condensation of the roof.

In this project, a new fastening system was used over the rock wool insulation, including SarnaTube plastic tubes and SarnaFast fasteners. The Sarnafil® S327 PVC membrane itself has been certified by the British Board of Agrément (BBA).

Sarnafil® S327 Roof Membrane

The S327 roof membrane is a heat-weldable membrane produced with an integral polyester reinforcement for high strength, for use in a Sika Sarnafil Mechanically-Attached System.