PLASTER special subjects There are cases where cracks that are visible in the plaster, are due to cracks that have occurred in the structural element that the plaster is covering. There are various reasons for this occurrence (e.g., soil subsidence, seismic vibrations, construction failures, detachments of the adhesive mortar under the plaster, a wide range of expansions and contractions due to rapid temperature variations, etc.). In any case, it is recommended to seek out the help of a professional (engineer) in order to re-evaluate these apparent and not-so-apparent factors that may affect the static adequacy and structural integrity of the building. Depending on the results, the appropriate repairs with certified products must follow. Patch marks is the term given to the appearance of a plaster coating, usually on a wall surface, where the locations of the mortar joints are clearly visible through the plaster. This is caused during the bonding of two coats when there is a curing time of hours or even days, due to the difference in absorption between the masonry and mortar elements. While patch marks can be unsightly, it is unlikely to lead to further cracks. To avoid any problem but also to deal with it, it is necessary to use resinous types of cement paste for smoothing and spackling the masonry. ‘STRUCTURAL CRACKS’ PATCH MARKS AND LINES 66 Repair & Renovation Guide
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