PV flat roof systems in the wind tunnel test

Before mounting systems are allowed to be installed, they must comply with corresponding standards, including EN 1991-1-4. Beside all the specifications regarding statics, materials, etc., this standard, including the national annex, contains specific information about wind loads to which PV systems and their mounting systems on roofs are exposed. In times of increasingly strong storms and even hurricanes this is indispensable for safety and must be included in the development. That is why the solar industry relies on so-called wind tunnel tests to keep the ballast of roof-penetration-free flat roof systems as low as necessary. In this blog entry, we explain how these tests are structured and what needs to be taken into account. (more…)

Static friction coefficient with AeroFix and AeroFlat

Static friction and spring scale

In the flat roof sector, aerodynamic mounting systems have evolved, especially for foil, bitumen, green and gravel roofs. The reason for this success is the simple assembly compared to other systems, as normally no roof penetrations have to be made and better load values are achieved through the aerodynamics. Instead, ballast is only applied depending on the project. In this context, the so-called static friction coefficient between the bracket and the roof cladding plays an important role in all aerodynamic systems on the market, for example in our IBC AeroFix and IBC AeroFlat systems, because it strongly influences the ballast. How this is determined exactly and what needs to be taken into account is explained in more detail below. (more…)