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Silane modified polyurethane-based waterproofing product




Color White
Elongation at break A one mm thick coat that cured for 5 days, the elongation at break was 400% by DIN 53504
Shore A Hardness 50 per DIN 53505
Vapor permeability 30gr/m2/hr.(ISO 9932)
Foot traffic After 12 hours, for application thickness of 1mm
End mechanical strengths After 2-5 days, depending on the environmental conditions (temperature, humidity)
Application temperature From +50 C to +400 C
Temperature resistance From -400 C to +800 C
V.O.C. (Volatile Organic Compounds): Limit value of the maximum content of V.O.C., per EU (Directive 2004/42 / EC) for this product (category A / i "one component special coatings" Type SB): 500 gr / lt (2010). The ready to use product contains a maximum of 350 gr / lt V.O.C.



One component polyurethane-based product of new age waterproofing technology, with silane modified resins. Developed with new mixing technology that creates a unique waterproofing flexible sealing coat with exceptional mechanical strengths. Its zero absorption of water within the next 24 hours following application, makes it THE innovative elastomeric waterproofer.



DUROSTICK WATERPROOF-PU applies easily on terraces, flat roofs and planters without any primer when the surfaces are dry, clean and free from loose materials. It is suitable and very effective for joints between chimneys as well as skylights with clay roof tiles. It is also the perfect sealing and waterproofing solution for surfaces which already have or will have photovoltaic modules.



 New surface preparation:

Remove from the surface all loose materials and mud using a stiff broom and clean water. Remove any black spots using DUROSTICK CLEANER D-95 or a bleach-water solution in a mixing ratio 1:1. Continuing, rinse the surface thoroughly with clean water. All surfaces must be completely dry. Any contact with water should be avoided for at least 48 hours before application with an aim to prevent trapping surface moisture before the waterproofing of the surface.

Existing surface preparation:

When dealing with a well adhered existing waterproofing, made with torch down, acrylic or cementitious material, apply DUROSTICK WATERPROOF-PU without using any primer.

  • Detached asphaltic materials: Using a roof scraper or a roofing torch, remove all detached asphaltic waterproofing materials.
  • Detached or deteriorated elastomeric materials: Follow the same procedure as the detached asphaltic materials.
  • Detached elastomeric material, not visible: Using a garden hose, pour water on the roof surface from about 1 meter high. Notice the change of the sound the water makes when it hits the detached parts of the waterproofing and mark then. Cut the detached sections using a razor blade and scrape the defective material off.
  • Application :Highly absorbent or unstable, loose surfaces must be primed with the DUROSTICK Solvent Base Primer, diluted up to 30% with THINNER 101 of DUROSTICK, using a roller, prior to the waterproofing application. After the primer dries, detect any hairline cracks (0.1 to 0.4mm) and coat them with one to two successive layers of the waterproofing material, until completely sealed. Any larger cracks (over 0.5mm) must be sealed using DUROFLEX-PU of DUROSTICK and after at least 12 hours, proceed with the waterproofing.Complete the waterproofing by applying the necessary 2 coats over the entire area using the DUROSTICK WATERPROOF-PU. Apply it using an emulsion brush, roller and/or a sprayer (airless sprayer 200 - 250bar), in 2 coats, at  minimum. Apply the second coat crosswise, after the first coat completely cures and is walkable.



  • Strong adhesion to concrete and plaster, stable even without the use of primer.
  • Its final surface is exceptionally durable and resilient; therefore it does not need any kind of additional enhancement of a varnish or any other product.
  • Due to its ultra-white color, it is highly reflective to solar radiation.
  • Excellent water vapor permeability.
  • It does not create bubbles.
  • Its flexibility remains unaffected even at -40°C.
  • Excellent resistance against mold and algae formation.
  • Resistant against corrosive gases in the atmosphere, chlorides, carbon dioxide and sulfur oxides.
  •  It is not affected (paint chalking) by UV radiation.
  • t offers quick walkability without sticking.
  • It is resilient against standing water.
  • It does not saponify.
  • Due to its unique water repellency, its ultra-white color does not turn beige from the mud rain.



Minimum consumption: 1.0 to 1.3lt/m2 for the necessary 2 coats, depending on the substrate. Recommended consumption: 1.5 to 2.0lt/m2 for 3 coats, depending on the substrate. The recommended consumption yields 15 years warranty.



  • Avoid applying the waterproofing if there is chance of rain within the next 24 hours
  • On complete curing, the product is harmless to health and the environment.
  • If the product is too thick to apply, dilute it 10% using THINNER 101 of DUROSTICK.


Use the appropriate amount needed to create a film of about 5x10cm from the WATERPROOF-PU product and do the same with another waterproofer we want to compare with. Create two different films of equal thickness, one for each material, by applying on a smooth surface of flexible plastic (polyethylene or polypropylene). Allow 48 hours to pass in order for the two materials to cure. Then remove the two films and weigh them on a precision scale. Next, submerge the 2 films in a container with water and let them remain there for a period of one to five days.After their stay in the water, simultaneously remove both film and reweigh them on the same precision scale. Calculate the % weight increase for each film that is related to their absorption of water.
Compare the results to find the difference in water absorption between the two materials. You will discover that the occurring result would be impressively in favor of the polyurethane sealant, WATERPROOF-PU, with much lower water absorption.


WATERPROOF-PU together with THERMOELASTIC COLOUR functions as a system when they get implemented on the roof and outer walls of a house respectively (in combination with energy efficient door and window frames). This combination reduces the indoor space temperature up to 20% thus reducing the energy consumption for heating or cooling up to 30%.



Store in dry places, in the factory sealed package for 12 months from the date of production.



After applying the product on a flat roof or a terrace, the installation of tiles or natural stone is not recommended. For those cases DUROSTICK recommends to waterproof the surface prior to the lining installation using one of our cementitious waterproofing products HYDROSTOP FLOOR, D-1, HYDROSTOP WATERTANK, HYDROSTOP ROOF or the 2 COMPONENT HYDROSTOP.



Container of 3.6lt and 18lt



Clean all tools with THINNER 101 of DUROSTICK orWhite spirit, after completion.