Roof coverings during their service life undergo the effects of many unfavourable factors from the external environment. Changes in the surrounding temperature cause deformations in both the roofing material and the base on which it is installed. The ability to withstand such deformations is the most important characteristic of roofing material and this depends on the raw meterials used in the manufacturing process.
Compound is a specially formulated mixture of bitumens and polymers. The main difference between compound types is in the kind of polymer used:
- SBS provide to the compound excellent low temperature workability, resistance to mechanical stress and ideal elastic performance. Their limitation is that they are unstable at high temperatures and do not withstand UV radiation.
- APP provide to the compound excellent UV resistance and high temperature stability. Their limitation is that they are less elastic and flexible at low temperatures.
- Advantages of polymers have led to the compounds which combine the best properties of SBS and APP polymers and are heat-resistant, UV stable, elastic and fl exible, even at low temperatures.
- POE elastomeric polyolefines allow to improve the fl exibility of APP modified bitumen membranes.
- Special antiroots additives (Preventol B5) make it resistant to damage caused by roots of plants and ensure reliable waterproofing.
- Special heat-adhesive bitumen compound that adheres to the old damaged waterproofing by torch-on application. This compound used for re-roofing materials.