Repair & Renovation Guide 133 5.1 Cracks on the walls, floor or ceiling of the basement (made of plaster or concrete) SOLUTION • When possible, try to identify and treat the reason that has caused the problem. Plaster • Cracks in plaster, depending on their size and their extent, can be sealed using special repair products like SUPER FLEX POWDER (p. 269), D-66 REPAIR (p. 238) or with the lightweight repair acrylic putty, ULTRALIGHT PUTTY (p. 276). • In case the damage is extensive, the possibility of total removal and replacement of the plaster should be considered with the flexible, multipurpose repair mortar ΜΕGAFIX (p. 261) or with the water-repellent one coat plaster D-42 ONE COAT (p. 236). Concrete If cracks are detected on the concrete elements and their size is between 0.1-1mm, they may be repaired with the injectable liquid epoxy resin D-33 (p. 235) in combination with the epoxy putty D-38 (p. 235) that facilitates its implementation. NOTE: For extended concrete damage select one of the concrete repair mortars: D-55 (p. 237), DUROFIX (p. 248), DS-240 (p. 243), DS-244 POWER MORTAR RESIN (p. 243), DS-245 POWER MORTAR RAPID (p. 244) or DS-247 (p. 244), depending on the thickness of the application and the strength required to deal with the damage. 5.2 Disintegrated - detached plaster from the basement walls POSSIBLE CAUSE Moisture penetrated into the mass and through the plaster. SOLUTION • Remove, if necessary, all the plaster from the affected area. • Waterproof the substrate with the brushable waterproofing mortar D-1 (p. 231), the flexible, fiber-reinforced, brushable waterproofing mortar D-1 FLEX (p. 231) or the two-component brushable waterproofing mortar HYDROSTOP WATERTANK PROFESSIONAL (p. 260). • Replaster the surface using the ready-mixed plasters D-40 (p. 236) as scratch and base coat and D-41 (p. 236) as topcoat, with the water-repellent, one coat plaster D-42 ONE COAT (p. 236) or with traditional plaster fortified with the acrylic emulsion additive for mortars D-20 (p. 233) and the polypropylene fibers DUROFIBRE (p. 248). In every case reinforce the base coat with the fiberglass mesh for plaster DS-1090 (p. 242). For smaller plaster restoration thicknesses, up to 1cm per coat, repair with the fast-setting white repair plaster D-32 (p 235), fortified with the acrylic emulsion additive for mortars D-20 (p. 233). 5.3 Moisture (stains and salt deposits) or water penetration from the floor/wall(s) of the basement POSSIBLE CAUSES • Rising damp. • Moisture affects the basement walls due to failing or non-existent waterproofing coating(s) on the exterior wall, before the backfilling. SOLUTION • Clean the surface well and remove the disintegrated sections. • If the affected area is too large then remove the entire coat of plaster.
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