When And How Can Sprayable Sealants Be Used?

Joints make up an extremely small share of the total volume of buildings, but are of the utmost importance for their existence. Proper sealing with sprayable sealants, correctly planned and carried out, is therefore crucial for the functionality and maintenance of the building structure.

Suitable sealants protect a joint from rain, moisture, wind, heat, cold or pollutants from the air. A joint is the intended or tolerance-related space between components. A plaster crack, on the other hand, is not planned or intended, and is therefore not considered a joint. Sprayable sealants are used to seal joints on external walls, windows, external doors, floors, as well as in sanitary and interior areas. External wall joints are subject to the scope of DIN 18540. This standard applies to elastic joint sealants with a permissible total deformation of 25% (ZGV) for the formation of external wall joints between components made of in-situ concrete and / or prefabricated concrete parts with a closed structure as well as unplastered masonry and / or natural stone.

BFS Leaflet No. 23 must also be observed. Elastic sealants must not be painted over the entire surface. When painting the facade after grouting, the coating on the sealant must be limited to 1 mm. Since the sealant comes into contact with the coating at the edges, the system must be compatible with paint compatibility in accordance with DIN 52452-4. In the floor area, ie walkable / accessible floor areas, balconies, terraces and warehouses, the joints that are listed in IVD Leaflet No. 1 are particularly relevant for the painting trade.

Sprayable sealants are also suitable for external cracks

As the area of the floor joint is very complex, advice from the sealant manufacturer is recommended. Windows and external doors are external components, so the seal must meet the basic requirements of the EnEV. The outer seal must be tight against rainwater and driving rain and temperature-related changes in length of the window and door materials. The inner seal must be airtight. Interior joints that are not subject to any technical regulations are connecting joints on interior doors, skirting boards, window sills, steps and from wall to ceiling (without drywall). In the case of adjacent joints to natural stone and porcelain stoneware, only special sealants for natural stones may be used. Plaster cracks both inside and outside are often provided with sprayable sealants. ZERO quartz spatula is recommended hereto achieve a plaster-like structure.

Proven systems for renovation and crack bridging are described in BFS Leaflet No. 19.