Video: QUESTION OF THE MONTH. Seal With Joint Sealing Tapes?
2023 Author: Hannah Pearcy | [email protected]. Last modified: 2023-11-26 11:39
A joint is the intended or tolerance-related space between components: a variety of systems are available for their professional sealing.
Sealing is done with pre-compressed and impregnated joint sealing tapes, among other things. The basis for their quality is described in DIN 18542, which specifies the properties and test methods for sealing tapes that are used to seal structural joints. These tapes mainly consist of an open-cell polyurethane foam as the carrier material, in which an impregnate is introduced, which ensures the essential properties of the sealing tape.
Sealing tapes are usually pre-compressed and supplied in roll form. In contrast to sealants, joint sealing tapes do not have to adhere to the joint flanks, but instead exert permanent contact pressure due to their restoring force on the joint flanks and largely adapt to the surfaces. This results in areas of application for which other sealing systems are not suitable. In addition to the known pre-compressed and impregnated joint sealing tapes (compression tapes), joint seals (e.g. on window connection joints) are also available, which also produce the heat-insulating functional level and the inner sealing level (3D) or only the inner sealing level (2D). These are also known as multifunctional sealing tapes. The basis is a pre-compressed and impregnated sealing tape with additional functional properties.
When sealing window connection joints, three sealing levels are defined:
1. Exterior joint sealing, which must be rainproof, permeable to diffusion, weatherproof and windproof.
2. Middle sealing level, also called functional level, which must be heat and sound absorbing.
3. Inner sealing layer, which must be airtight and diffusion-proof than the outer seal.
Pre-compressed and impregnated joint sealing tapes are not permitted for the areas of accumulating leachate or standing water. It is not recommended to paint over sealing tapes, since paint coats that penetrate far into the sealing tapes cause the surface to harden and thus lose elasticity, so that the sealing tapes can no longer compensate for the movement of the joints.
Author: Rainer Hülsermann, Head of Application Technology ZERO-LACK
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