Schletter Roof Hook Universal

Schletter Roof Hook Standard Proline

Roof hook mounting

The installation on pitched tiled roofs is still one of the most frequent kinds of installation for photovoltaic plants. Usually, so-called "roof hooks" or "rafter anchors" are used. An anchor plate usually serves for the fastening to the roof rafter with wood screws, a bar between the roof plates transmits the holding force outwards. On these bars, the load-bearing profiles for the modules are fastened. The geometry of the load transmission is usually considerably limited by the shape of the tile, thus an exact check is required especially if there are heavy loads. As most tiles are grooved above each other, they inevitably have to be cut to shape in most cases, but the tiles must not be weakened in an impermis-sible manner by these adaptions.

This documents compiles important information on choice of roof hooks, planning and mounting.

Generally it has to be stated that with most photovoltaic plants on roofs, not enough roof hooks are used and to make matters worse the roof hooks often are too weak. In many cases, it is completely ignored where and in what load conditions a specific plant is installed when the dimensioning is created. The damage cases regarding plants and roofs are still rather negligible, but they have already led to increased professionalism. This development is especially positive regarding the reduction of the risks for the installation companies. It should be considered that especially the mounting system that only represents 5 to 8% of the costs of the solar plant is crucial for the stability of the complete plant and thus can be the decisive factor whether or not there are damage cases (for example tile breakage, roof untightnesses, material damage, etc.).

Marine

RV's

Caravans

Off-Grid Systems

Tiny Houses

Cabins