Driving rain
As rain is rain of the designated wind is brought out of its vertical drop direction. As a result, the raindrops can hit not only the ground, but also vertical surfaces. This fact has an unfavorable effect on buildings, since many building materials soak up the water ( capillary effect ) and moisture damage ( efflorescence , frost damage , mold and fungus growth) can occur. Frequent moisture on building components not only results in moisture damage, but also accelerates the weathering of the respective building materials. Wood surfaces and masonry without plaster are particularly at risk . In these cases the moisture penetrates the joints and surfaces and can only dry very slowly.
Protection options
In order to avoid damage, the components that can come into contact with the driving rain must be as tight as possible, or they must be insensitive to moisture. In the case of wooden surfaces, for example, attempts are made to arrange drip edges or to apply wood preservatives . Masonry joints must not be too deep, but must be almost flush with the brick. Plaster protects particularly well when it is hydrophobic, i.e. water-repellent.
See also
swell
- Batran, Bläsi, Eichner: Expertise in construction . 8th edition. Handwerk und Technik Verlag, 2002, ISBN 3-582-03503-4