Mounting triangles are used for the installation of photovoltaic panels on flat roofs. We differentiate between invasive and non-invasive mounting. Invasive mounting is used when penetration through the roof membrane occurs. In this case, we use double-thread screws for wood or steel. Non-invasive (ballasted) mounting is applied when there is no possibility to use double-thread screws. The supporting structure is then weighted down with concrete blocks.