Repair & Renovation Guide 127 4.1 Moisture penetration due to lack of waterproofing of the roof (concrete slab) POSSIBLE CAUSES Complete lack of waterproofing or insulation and capillaries or other larger cracks on the concrete slab of the roof. Clean thoroughly and remove all loose sections, foreign objects and dust. SOLUTION Α’ • Stabilize the surface with the micromolar stabilizer AQUAFIX (p. 230) or with the SOLVENT- BASED PRIMER (p. 276), diluted up to 30% with THINNER 101 (p. 270). In case that a polyurethane-based waterproofer will be used, prepare and stabilize the surface with the water-based clear epoxy primer WATERPROOF EPOXY PRIMER AQUA (p. 272). • Waterproof the roof surface by using: • Elastomeric, acrylic roof waterproofers, such as DS-220 (p. 243), Νο39 (p. 280) or TECHNOPROOF (p. 270). • The polyurethane-based waterproofer HYDROSTOP-PU (p. 258) or the two-component, polyurea-based roof waterpoofing coat for roofs WATERPROOF 500 (p. 272). • To meet the requirements of heavier use, walkability and increased stress, waterproof with either cementitious roof waterproofers HYDROSTOP ROOF (p. 258) or TWO-COMPONENT HYDROSTOP (p. 257). Reinforce the cementitious waterproofers with either fiberglass mesh DS-490 (p. 247) or DS-4160 (p. 247). SOLUTION Β’ If a decision is made to waterproof and thermally insulate at the same time, choose the thermal insulation and waterproofing system for roofs COOL ROOF (p. 190-191) if possible, or the lightweight thermal insulation and waterproofing system for roofs COOL ROOF LIGHT (p. 190-191). SOLUTION C’ If there are reasons that do not allow for the application of waterproofing and insulation systems on the roof, the solution is in the Roof Waterproofing System dB BLOCK + DS-220. A waterproofing system with multiple benefits (waterproofing, soundproofing, crack, vibration and thermal protection), just by using the multipurpose paste dB BLOCK (p. 240) in a single application and its coating with the elastomeric waterproofer for flat roofs (liquid rubber) DS-220 (p. 243) in two coats. SOLUTION D’ If the necessity is for waterproofing and thermal protection of the structures, then the application of the product for thermal protection and roof waterproofing TECHNOPROOF THERMO (p. 270) is an easy, quick, and affordable solution. 4.2 Existing waterproofing coat (asphaltic roll roofing, cementitious, elastomeric) with a few or more sections that failed or aged and weathered SOLUTION • If the extent of the problem is small, repair the damage in the affected areas by applying the elastomeric waterproofer for flat roofs (liquid rubber) DS-220 (p. 243). Overlap the existing waterproofing coat by at least 10cm. • If the problem is in a large area and we cannot spot repair, then remove all of the existing waterproofing coat. • Continue by removing from the surface all loose sections, foreign objects and dust, stabilize the surface and install the type of waterproofing product of choice, as described in PROBLEM - SOLUTION 4.1.
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