![]() With mechanical fastening, the whole roof package is fastened in one work step and is therefore the most economical solution for the contractor when it comes to assembly time. ![]() With regards to the fire load, the use of mechanical fastenings is permitted without certification according to DIN 18234, the so-called Industrial Directive, unlike with bonded structures. For example, there is no restriction on processing due to temperature, weather, surface properties or the building use. However, society's rising sustainability concerns present arguments against anchoring with bonding, because the removal, separation and disposal of bonded roof constructions is either impossible or is only possible with a great deal of effort.Īnchoring using mechanical fasteningsAnchoring with mechanical fastenings offers a lot of advantages over the systems we have already discussed. Consequently, the contractor almost always bears the risk in the event of damage. In practice, this is hard to implement or not implemented at all. This means that all of the necessary basic conditions such as temperature, moisture content, adhesion volume and the surface properties have to be documented. However, this is only possible if they document the assembly, which can be a big task. The contractor must ensure they have comprehensive insurance in case any damage occurs. In addition, the fact that every position has to be individually bonded means an enormous amount of additional effort for the contractor. And the limited shelf life of the adhesive and the time-consuming proper disposal of empty adhesive containers mean an increased workload, too. These include the processing temperature, the right adhesion volume, the moisture content of the building material, and the surface properties of the load-carrying system. When processing, there are many boundary conditions which are supposed to be met, but which in practice can rarely be met on building sites. A bonded system has no initial adhesion and must first be secured. Anchoring using PU bondsWith anchoring using PU bonding, the biggest disadvantages are in the attachment of roofing membranes.
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