76 Repair & Renovation Guide USEFUL TIP The addition of 1lt improving additive D-20 (p. 233) in the mixing water for each bag of plaster, increases its adhesive strength with the substrate, its water tightness, and flexibility. EARTHQUAKE: RENDERS/PLASTERS special subjects Restoring limited extent cracks in plaster The stress that the wall surfaces of a structure receive due to an earthquake is very likely to lead, among other things, to the creation of different sizes of width and extent cracks in its top coat (plaster). To repair the problem, once the stability of the surface is verified, it is necessary to widen the crack(s) to determine the depth of the damage done. If the depth and the width are confined at the limits of the coating and do not continue to the structural substrate (brick, concrete, stone, aircrete or other), then the crack(s) can be repaired with the appropriate repair product. First of all, thoroughly cleaning and properly preparation of the substrate are required. Among the available products, and depending on the depth and width of the crack(s), there are the following: SUPER FLEX POWDER (p. 269) for cracks up to 15mm deep, D-66 REPAIR (p. 238) for cracks up to 30mm deep. In cases where the seismic stress on the wall surface results in the partial detachment of the coating at one or more of its sections, the restoration of the damage is done easily and quickly by applying the appropriate repair product, either D-32 (fast setting white repair plaster, p. 235) or D-42 ONE COAT (water repellent one coat plaster, p. 236), after removing all loose sections and thoroughly cleaning the surface to be repaired. Restoration of detached coatings on small surfaces (usually not to the full depth of the coating, down to the structural element)
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