The most exposed parts of a building, those exposed to the effects of wind, temperature oscillations, UV radiation and precipitation, is the roof. To fulfil the purpose of protecting the building against external effects, especially the harmful action of moisture, roofs must be waterproofed.
What is most important for waterproofing is that it must comply with requirements. The requirements for waterproofing of roofs include excellent mechanical and thermal resistance, UV stability and durability. The DRACO GARD 500 / DRACO GARD 505 hydrophilic polyurethane coating, or so-called liquid rubber, meets these requirements.
To ensure adequate adhesion of the coating onto the surface without the possibility of subsequent separation, the surface must be coated with a primer. The choice of the DRACO PRIMO 510 / DRACO PRIMO 530 / DRACO PRIMO 850 primer depends on surface porosity and installation temperature.
Given that roof surfaces are large, the recommendation is to saw the expansion joints and divide up the area into a number of smaller surfaces. The sawed expansion joints are sealed using the DRACO BAND 120 waterproofing strip, whereas the coating is strengthened using the DRACO BAND 210 reinforced canvas.
Large quantities of precipitation and small inclinations create difficulties due to the retention of water on roofs; hence, to ensure an adequate height, a polyurethane coating is applied with a rise on the roof parapet. The coating on joins between the roof and parapets and on penetrations are additionally sealed using the DRACO BAND 120 strip.
The DRACO GARD 500 / DRACO GARD 505 basic primer can be given additional mechanical resistance and elasticity by applying the DRACO TOP 500 / DRACO TOP 505 top coating. The polyurethane can be the final layer, and for the case that the project envisages ceramic tiles as the final covering, the top coating can be applied along with the sprinkling of quartz sand to provide better adhesion of the ceramic tiles.