Repair & Renovation Guide 129 4.6 Moisture penetration through the slab (or from the lining installed on it) and subsequent peeling and disintegration of paint and plaster on the fascias and overhangs of the roof and around the upper parts of the wall surface beneath the roof POSSIBLE CAUSES As described in PROBLEM - SOLUTION 4.5. SOLUTION Concrete slab without waterproofing: It is absolutely necessary to waterproof the slab (as described in PROBLEM - SOLUTION 4.1). Concrete slab with failures or damage: It is absolutely necessary to restore all the damage (as described in PROBLEM - SOLUTION 4.2). Lined roof: Related PROBLEM - SOLUTION 6.4. In each of the above cases, after dealing with the problem(s), repair the collateral damage to the structural elements. 4.7 Detachment and lifting of lining elements installed on the roof or terrace POSSIBLE CAUSES & SOLUTION, as described in PROBLEM - SOLUTION 6.5. 4.8 Cracked lining elements (tiles) installed on the roof or terrace POSSIBLE CAUSES & SOLUTION, as described in PROBLEM - SOLUTION 6.5. 4.9 Lack of expansion and contraction joints on the lined surface SOLUTION • Create expansion joints around the lined area, at the junction with the vertical structure elements (walls), and on every 16-20m2 of the lined surface. • Apply the high adhesion polyurethane elastomeric sealant DUROFLEX-PU (p. 249) after priming the joints with PRIMER-PU (p. 263), and filling them with the backer rod DS-265 (p. 246) if and when the depth of the joint is big and needs to be checked. • At the same time check if the rest of the grout joints could potentially crack or disintegrate and if necessary, proceed to the necessary repairs. 4.10 Failure or absence of sealant at the junctions and breakpoints of dissimilar materials and installations on the roof (railing, antennas, overhangs etc.) SOLUTION • Thoroughly clean the areas between the lining elements and other materials (metal or wood rails, mounting devices etc.). • Apply the high adhesion polyurethane elastomeric sealant DUROFLEX-PU (p. 249) after priming the joints with PRIMER-PU (p. 263). 4.11 Grouting failure of tiles, marble, or granite (cracked and disintegrated) POSSIBLE CAUSES • Inappropriate grouting product. • No consideration for waterproofing the grout joints. • Natural wear. SOLUTION Repair the damage, as described in PROBLEM - SOLUTION 6.1.
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