One-component, fiber-reinforced, thixotropic, polyurethane, liquid waterproofing membrane for roof details and connections. ISOFLEX PU 500 DTL is based on elastomeric, hydrophobic polyurethane resins of excellent mechanical, chemical, thermal and weather resistance. The product has additionally the following properties:
- Forms a continuous, elastic, waterproof, vapor-permeable membrane, without seams or joints.
- Features excellent adhesion to varios substrates, such as concrete, screeds, wood, metal, bituminous membranes and most waterproofing membranes.
- Applicable even to irregular substrates.
ISOFLEX-PU 500 DTL is suitable for waterproofing roof details such as:
- Wall-floor junctions
- Pipes
- Gutters
- Skylight domes
- Chimneys
- Rooftop ventilation and air-conditioning units.
- Photovoltaic systems
- Solar systems
Substrate preparation
The substrate must be dry (moisture content <4%) and free of grease, loose particles, dust, etc.
1.1. Concrete surfaces
Any existing cavities in concrete should be repaired in advance. Severe cracks on the substrate must be locally primed 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 approx. 200 g/m2. Surfaces with moisture content > 4% should be primed with the special two-component polyurethane primer PRIMER-PU 140, with a consumption of 100-250 g/m2.
1.2. Smooth – Non-absorbent surfaces
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.
Consumption: 150-200 g/m2.
Depending on the weather conditions, ISOFLEX-PU 500 DTL is applied within 24-48 hours from priming as soon as the moisture content falls below 4 %.
1.3. Metal surfaces
The metal surfaces should be:
- Dry and stable.
- Free of materials that might impair adhesion, e.g. dust, loose particles, grease, etc.
- Free of rust or corrosion that might impair adhesion.
Having been prepared by brushing, rubbing, sandblasting, etc. and then thoroughly cleaned from dust, metal surfaces are primed with the EPOXYCOAT-AC anti-corrosion epoxy coating in one or two layers. EPOXYCOAT-AC is applied by roller, brush or spray. The second layer follows after the first one has dried but no later than 24 hours.
Application-Consumption
Before application, it is recommended to slightly stir ISOFLEX-PU 500 DTL with a wooden or metal stick, until it becomes homogeneous. Excessive stirring should be avoided in order to prevent air entrapment in the material. ISOFLEX-PU 500 DTL is applied by brush in 2 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 after 16-36 hours, depending on the weather conditions. Total consumption: approx, 1.2-1.5 kg/m2, depending on the substrate.
