The Technical Processing of the Joints in the Façade Systems

The study examines the assembly and interface conditions between elements of different composition and production within the façade systems. The examination of the technical interfaces involves the development and application of sealants, based on the loads exerted on the jointing devices, in order to fulfil the requirements of sealing and tightness with respect to mechanical, thermal and hygrometric, water, air and wind stresses. The execution of sealants concerns jointing techniques according to the adhesion to the contact surfaces. The sealants are subjected to stresses due to ultraviolet solar radiation, low temperatures and thermo-hygrometric loads. At the same time, the sealants can be subjected to failure procedures, due to the loss of adhesion, recalling the correct dimensional, geometric and connective design methods. The design study of joints recalls the evaluation of the width, the in-situ preparation of the adhesion surfaces and the filling of the thickness between the technical elements. The design study differs from the sealing of glass enclosures and technical elements, according to the different application types. In addition, the execution of the sealing involves the analysis of the surface treatment conditions and the physical state of the substrates, considering the procedures for cleaning, the application of the primer, the application of the “joint filler” and masking on the sub-layer surfaces.