Anchoring Roofing Membranes Using PU Adhesive Bonding

With anchoring using PU bonding, the biggest disadvantages are in the attachment of roofing membranes.

 

Installation Challenges with PU Bonded Flat Roof Systems

A bonded system has no initial adhesion and must first be secured. When processing, there are many boundary conditions which are supposed to be met, but which in practice can rarely be met on building sites. 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.

And the limited shelf life of the adhesive and the time-consuming proper disposal of empty adhesive containers mean an increased workload, too. In addition, the fact that every position must be individually bonded means an enormous amount of additional effort for the contractor.

 

Insurance, Documentation and Liability Considerations for Bonded Roof Systems

The contractor must ensure they have comprehensive insurance in case any damage occurs. However, this is only possible if they document the assembly, which can be a big task. This means that all the necessary basic conditions, such as temperature, moisture content, adhesion volume and the surface properties, must be documented. In practice, this is hard to implement or not implemented at all. Consequently, the contractor almost always bears the risk in the event of damage. 

 

Sustainability and End-of-Life Challenges with Bonded Roof Constructions

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.