The most exposed parts of buildings exposed to wind action, temperature oscillations, UV radiation and precipitation are roofs. The purpose of a roof is to protect the building from external, damaging effects, whereas for the roof to protect the building from water and moisture it must be waterproofed.
Waterproofing of a roof requires choosing a waterproofing that can cope with all loads to which roofs are subjected, and in more recent times the final layer should exhibit energy efficiency properties. The DRACO GARD 500 / DRACO GARD 505 polyurethane coating, or so-called liquid rubber, meets the requirements of UV stability, mechanical and thermal resistance as well as energy efficiency, and due to its chemical binding with surfaces, prevents wind from raising and separating the coating.
Improved adhesion of the surface coating is achieved by using a primer which stabilises the surface and blocks moisture. Selecting the DRACO PRIMO 500 / DRACO PRIMO 510 / DRACO PRIMO 850 primer depends on the type and porosity of the surface and also the construction temperature.
When waterproofing large roof surfaces, the recommendation is to make sawed expansion joints which are then sealed using the DRACO BAND 120 self-adhesive strip, followed by a coating which is further strengthened with the DRACO BAND 210 reinforcing canvas. For closed roof designs and dangers from stagnant water, a polyurethane coating is applied by raising it to the roof parapet. Coating on the joint between the roof and parapet including penetrations is additionally sealed using the DRACO BAND 120 strip. When polyurethane functions as the final layer, direct exposure to the sun can in time cause the coating to chalk.
To prevent this from happening with the basic coating, additional UV and mechanical protection is applied as a top coating. Selecting the DRACO TOP 500 / DRACO TOP 505 / DRACO TOP 510 top coating depends on the required elasticity and the final, matte or gloss finish for the roof.