Bitumen Waterproofing Membranes
1.1 Plastomeric APP membranes
These waterprooﬁng membranes are produced from bitumen and modiﬁed with plastomeric, atactic-polypropylene (APP) polymers. The properties of that polymer are highly expressed into two main characteristics – high hot- and cold resistance. It increases resistance to ageing of the material and hence the life of the waterproofing system. APP bitumen membranes are suitable to be applied in areas with extremely hot temperatures as well as on large areas with vertical surfaces exposed to direct sunlight due to their constant heat resistance the time. The high resistance of these materials allows their application for waterproofing of vertical and inclined roofs without any risk of being compromised due to bitumen softening or flow. These membranes are widely used for the waterproofing of flat reinforced concrete roofs.
1.2 Elastomeric SBS membranes
They are produced from SBS /styrene – butadiene – styrene /modified bitumen. The properties of that polymer create a product with great elasticity and flexibility at low temperatures and good heat resistance. It increases resistance to ageing of the material and hence the life of the waterproofing system. These materials are very suitable to be applied in the winter in cold areas implying operation at extremely low temperatures. SBS /styrene – butadiene – styrene /modified bitumen membranes have good adhesion on pretreated by primer concrete surface and therefore they are used for waterproofing of vertical walls and foundations.