ISOFLEX-PU 500 is a one-component, polyurethane, liquid waterproofing membrane for flat roofs offering:

• Excellent mechanical, chemical, thermal, UV and weather resistance properties, as it is based on pure, elastomeric, hydrophobic polyurethane resins.
• A continuous, elastic, waterproof and vapor-permeable membrane, without seams or joints.
• Excellent adhesion to various substrates like concrete, cement mortars, wood and most waterproofing layers.
• Applicability even to irregular substrates.
• Suitability for green roofs, flower beds, etc.
• Availability in white and other colors. When a dark color of ISOFLEX-PU 500 has been chosen as an exposed layer, it is necessary to protect it with a layer of TOPCOAT-PU 720 in the same color.

ISOFLEX-PU 500 is ideal for waterproofing:

• Flat roofs and balconies as an exposed waterproofing membrane.
• Under tile layers in kitchens, bathrooms, balconies and flat roofs, as long as quartz sand has been broadcast on its lastlayer.
• Under thermal insulation boards on flat roofs.
• In construction works, such as highways, bridge decks, tunnels, etc.
• In open parking deck system.

Application-Consumption
Before application, it is recommended to slightly stir ISOFLEX-PU 500 until fully homogeneous. Ecessive stirring should be avoided to prevent air entrapment.

a) Full-surface waterproofing
ISOFLEX-PU 500 is applied by brush or roller in two layers. The first layer is applied 2-3 hours after priming and while PRIMER-PU 100 is still tacky. The second layer should be applied crosswise after 8-24 hours, depending on the weather conditions. Consumption: 1,0-1,5 kg/m2, depending on substrate type. In case of dense, multiple cracks all over the surface, it is strongly recommended to fully reinforce ISOFLEX-PU 500 membrane with 100 cm wide strips ofpolyester fleece (60 g/m2 or 120 g/m2), which must overlap by 5-10 cm.

b) Local waterproofing of cracks
In this case, the primer is applied on the substrate only along the cracks, to a width of 10-12 cm. Two-three hours after priming, the first ISOFLEX-PU 500 layer is applied and, while is still fresh, a 10 cm wide polyester fleece strip (60 g/m2 or 120 g/m2) is embedded lengthwise. Two extra ISOFLEX-PU 500 layers are applied along the cracks, completely covering the reinforcement. 

c) Under-tile waterproofing
ISOFLEX-PU 500 is applied by brush or roller, in two layers, over the entire surface. ISOFLEX-PU 500 should be locally reinforced along joints and wall-floor junctions by embedding a 10 cm wide polyester fleece strip (60 g/m2 or 120 g/m2) on its first layer while is still fresh. Then, two wxtra ISOFLEX-PU 500 layers are applied along the cracks, completely covering the reinforcement. After applying the final layer and while this is still fresh, quartz sand (0,3-0,8 mm) must be broadcast. The quartz sand must be completely dry. Consumption of quartz sand: approx. 3 kg/m2. After 24 hours, any loose grains should be removed with a high-suction vacuum cleaner.