Gidroizol a roll insulation material made of asbestos or impregnated cardboard asbestotsellyuloznogo Bitumens. Cardboard is best asbestotsellyulozny with cellulose content up to 20%. Cardboard without pulp relatively little strong and the impregnation of its bitumen spreading. In the absence of asbestos used cardboard paper. Gidroizol produce two grades: HI-1 and HI-2.
1m2 weight paperboard is 400g, and the weight ratio of bitumen to cardboard - about 1:1. In accordance with GOST 7415-55 waterproofing quality of water is determined by the performance saturability which 24 hours must be saturated by weight not more than 10% in grade waterproofing GI-1 and no more than 13% - from waterproofing brand HI-2. It should be noted that these figures are high saturability water and significantly reduce the waterproofing properties. Water-resistant pressure of the water column height of 50mm is at least 20-30 days. The tensile strength of the strip waterproofing standard. size (50h180mm) - At least 30 kg the assumed decline after water saturation for GI-1 and 25% for PG-2 - to 32%. The flexibility gidroizol at 18 ± 2 ° C must withstand at least 10 double knee bends at an angle of 180 ° C.
Gidroizol produced in rolls of 20 m and a width of 950 ± 5 mm. In the canvas are not permitted cracks, holes, tears, creases, surface fabric is brushed or smooth.
The most widely used gidroizol finds as okleechnoy waterproofing of underground structures and designs in multilayer roofing, and is also used as a corrosion protection of structures and piping attaching hot bitumen mastic. | 
