DiagnosticIn addition to the succession of rain, sun radiation and frost, the difference between the coefficients of expansion of the materials is at the origin of cracks, large or narrow, in the facades of buildings. It is first necessary to assess the extent of the problems and to carry out a first cleaning - because an old coating can hide more important degradations.
The right productsWhen you have identified the nature of the cracks as well as the repairs to be carried out on the shell and, possibly, on the gutters, buy suitable products: sealants, plasters and mortars intended for facades.
Saltpetre diagnosisThe presence of saltpetre on an interior wall (or even outside) is always synonymous with humidity inside the masonry, and requires exterior and interior treatment (and even, often, injections). However, do not confuse saltpetre (whitish efflorescence due to the action of bacteria in the presence of moisture, when the soil is rich in nitrous organic matter) and hard white patches, which even form on perfectly healthy and dry, and which come from building materials: these crystals are eliminated by simple scraping.
Tools & materials• Trowel
Trough to spoil
One-component repair mortar
Gutter sealing tape
Facade cladding (resins)