All roofing works (Pitched or Flat)
Roof coverings made of roll and mastic materials are applied to smooth, strong concrete, asphalt-concrete, or gypsum-concrete foundations. The material is cemented to the foundation and the layers are glued to one another by bitumen-based and tar-based roofing mastics, depending on the type of impregnation of the roll material used. Roofing mastics are usually prepared at a central location in jet mixers and transported by pumps through piping to the roof. After priming the base, the roll sections are laid out across the slope of the roof (for a roof pitch of up to 15 percent) or along the slope (for a pitch of more than 15 percent). The number of layers of material and the methods of gluing them are determined by the plan. The sections of the roofing carpet are glued in layers in an arrangement of transverse connecting seams 100 mm wide and longitudinal seams 70–100 mm wide. In the case of roof pitches of up to 10 percent, the cement may be applied and the roll materials laid and glued by roofing machines. A protective roofing layer is applied by sprinkling crushed stone (gravel) or other frost-resistant mineral materials (with a coarseness of 3–15 mm) on a layer of tarred or disinfected bituminous mastic.