ISOFLEX-PU 540

ISOFLEX-PU 540 is a one-component polyurethane liquid waterproofing membrane.

  • Based on pure elastomeric, hydrophobic polyurethane resins, it offers high mechanical and chemical properties to the product.
  • Forms a seamless, joint-free, elastic, waterproof and vapor-permeable membrane.
  • Has excellent adhesion to a variety of substrates,  such as concrete, cement screeds and most waterproofing layers.
  • Applicable even to irregular substrates

Certified according to EN 1504-2 and classified as coating for surface protection of concrete. Certificate No.: 2032-CPR-10.11. CE marked. Also certified as root-resistant according to UNE CEN/TS 14416 EX:2014. ISOFLEX-PU 540 has been successfully tested by a third-party laboratory has resistance to root penetration, according to CEN/TS 14416:2014.

ISOFLEX-PU 540 is suitable for waterproofing:

  • Under tiles in wet areas (bathrooms and kitchens), balconies, auxiliary rooms, etc.,as long as quartz sand has been previously broadcast on its last layer.
  • Flat roofs and balconies.
  • Under thermal insulation boards on flat roofs.
  • Foundations.

Substrate Preparation
In general, the substrate must be dry (moisture content < 4%), clen, free of grease, loose particles, dust, etc.

1.1 Concrete substrates
Any existing cavities in concrete should be repaired in advance. Severe cracks in the substrate must be primed locally and after 2-3 hours (depending on the weather conditions) must be sealed with the polyurethane sealants FLEX PU-30 S or FLEX PU-50 S. Concrete and other porous surfaces with moisture content < 4% should be treated with the primer PRIMER-PU 100, with a consumption of approxy. 200 g/m2. 

1.2 Smooth and non-absorbent substrates
Smooth and non-absorbent surfaces, as well as surfaces with bituminous membranes or other old waterproofing layers, must be primed with the water-based epoxy primer EPOXYPRIMER-500, thinned with water up to 30% by weight. The product is applied by brush or roller in one coat. Depending on the weather conditions, ISOFLEX-PU 540 is applied within 24-48 hours from priming, as soon as moisture content falls below 4%.

Application-Consumption
Before application, it is recommended to slightly stir ISOFLEX-PU 540 until a homogeneouse mixture is formed. Extensive stirring should be avoided to prevent air entrapment.

a) Full-surface waterproofing
ISOFLEX-PU 540 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 lyer should be applied crosswise after 8-24 hours, depending on the weather conditions, Consumption: 1.2-1.5 kg/m2, depending on the substrate. In case there are dense, multiple cracks all over the surface, it is strongly recommended to fully reinforce ISOFLEX-PU 540 membrane with 100 cm wide strips must overlap by 5-10 cm. In that case, 2-3 hours after priming, the first layer of ISOFLEX-PU 540 is applied covering the reinforcement to a width of 100 cm and while still fresh, a strip of polyester fleece is embedded. The same application process is followed over the remaining surface. 

b) Local waterproofing of cracks
In this case, the primer is applied to the substrate only across the cracks, to a width of 10-12 cm. Two-three hours after priming, the first ISOFLEX-PU 540 layer is applied  and, while still fresh, a 10 cm wide polyester fleece strip (60 g/m2) is embedded lengthwise. Then, two extra ISOFLEX-PU 540 layers are applied along the cracks completely covering the reinforcement. 

c) Waterproofing under tiles
ISOFLEX-PU 540 is applied by brush or roller in two layers. ISOFLEX-PU 540 should be locally reinforced along joints and wall-floor junctions by embedding a 10 cm wide polyester fleece strip on its first layer while still fresh. After the application of the final layer and while it 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 3kg/m2. After 24 hours, any loose grains should be removed with a high suction vacuum cleaner. Tiles should be fixed with a high-performance, polymer-modified tile adhesive, such as ISOMAT AK-22, ISOMAT AK-25.

  • In case of application by spray, it may be diluted, depending on the weather conditions, up to 10%, only with the special solvent SM-28.
  • ISOFLEX-PU 540 is not suitable for contact with chemically treated water of swimming pools.
  • Temperature during the application and hardening of the product should be between +8oC and +35oC.
  • The consumption of ISOFLEX-PU 540 should not exceed 750 g/m2 per layer.
  • When applied to exposed surfaces, the use of the protective coating TOPCOAT-PU 720 with a consumption of250-350 g/m2 for two layers is required.
  • Opened containers should be used at once and cannot be re-stored.
  • ISOFLEX-PU 540 is intended for professional use only.
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Surface: Concrete, wood, metal

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Application: Brush or roller