BTM Elastobit is a fiberglass or polyester felt reinforced waterproofing membrane made of bitumen modified by SBS (styrene-butadiene-styrene), resistant to plant roots, coated with PE (polyethylene) film on the upper and lower surfaces, having a high elasticity, applied with an oxyacetylene burner or hot asphalt. We, BTM, may produce 10 types of Elastobit membrane with different technical properties.