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Elastomeric waterproofer for roofs





White, brick red



Elongation at break

(per ASTM D 412): After 8 days curing and at 1 mm thick membrane, the elongation at break was determined at 300%

Full tightness

7 atm per DIN 1048

Moisture resistance

At least 5 years

Application temperature

From +8 °C to +30 °C

Temperature resistance

From -20 °C to +80 °C

Laboratory testing by the Ministry of Environment & Buildngs (ΚΕDΕ 1580/ 243)


VOC (Volatile Organic Compounds):
Limit value of maximum VOC content according to EC (Directive 2004/42/ΕC) for the particular product (category A/c: ‘Coatings for exterior walls of mineral substrate, type WB): 40gr/lt (2010). Ready to use product contains maximum 35 gr/lt VOC.

Consumption & resistance of the elastomeric waterproofer DUROSTICK Νο39
Product quantity/m2 Coats of application Minimum time of
proper function
1Kg 1 3 years
1.5Kg 2 3-5 years
2Kg 3 5-6 years



Acrylic, elastomeric and solvent free waterproofing product for roofs. It creates a uniform, impervious to water, membrane, without seams. Distinguished for its high adhesive strength and its long term resistance to adverse weather conditions. It perfectly covers hairline and micro cracks, while it prevents their reappearance. It maintains its flexibility at temperatures ranging from -20°C to +80°C. It does not allow the creation of moisture related problems due to any future expansion and contraction of surfaces. Its brilliant white color significantly reduces the heat absorption from the roof slab and reduces its temperature up to 20%. Classified as product for surface protection of concrete surfaces (c) per EN 1504-2.



DUROSTICK No39 easily applies on terraces, and roofs to be coated with clay roof tiles. It is also suitable for corners, edges, and lead lined roof valleys. Great for spot crack sealing.



1. New surface preparation
Using a stiff broom and water thoroughly clean any loose areas, dust and mud (pic. 1). Remove all black spots (mold/mildew) using DUROSTICK D-95 CLEANER or a bleach/water solution, at a mixing ratio of 1:1. Follow by rinsing thoroughly with plenty of water. Surfaces to be sealed have to be thoroughly dry and to be protected from water for at least 24 hours prior to the application, thus preventing any penetration and trapping of moisture.
2. Existing surface preparation
•Detached torch-down roofing:
Remove them using a wide roofing scraper and roofing torch or other mechanical means.  
•Well adhered existing torch-down roofing material, only require a first  coat of No39, diluted 5% with water and a second coat undiluted to complete the waterproofing.
•Remove detached or deteriorated elastomeric waterproofers, using a wide roofing scraper or other mechanical means.
•Detached elastomeric material, that are not visible, can be found 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 them. Cut the detached sections using a razor blade and scrape the defective material off.
3. Application
Using a roller, first apply the micromolar stabilizer, AQUAFIX undiluted, or the SOLVENT BASED PRIMER, diluted 30% with THINNER 101 of DUROSTICK. Alternately, dilute No39 with water, at a ratio of 1:1 and use it as a primer, assuming that the roof does not have any deteriorated sections. Once the priming product dries, locate any possibe hairline cracks (0.1-0.4mm). Individualy coat each crack with one-two layers, to seal them completely. If the width of the cracks is between 0.5-1mm, it is recommended to seal them using the DUROSTICK ACRYLIC CAULK or the elastomeric sealer, ACRYLAT, using a putty knife.
Continue by applying two coats of No39 over the cracks to complete their sealing.
Complete the surface waterproofing by applying two coats over the entire area using DUROSTICK No39.
Apply the second coat crosswwise, once the first one is completely dry and walkable.



1.0-1.5kg/m² for two coats, depending on the substrate.


Store in places protected from frost for a minimum of 24 months after production date.


This product, based on current European and national legislation, does not require any hazardous material label.
It is however recommended to keep out of reach of children.
If swallowed, seek medical advice immediately and show the container or label.


Avoid the application of DUROSTICK Νο39 waterproofing when there is a possibility of rain within the next 24 hours.


Carton box with 12 pcs. of 1 kg each one
5kg & 15kg containers