Flooring mastic. Synonym: Floor mastic for a slatted floor. It is an asphalt-based product, resin and a special solvent. May not be mixed with tar or with heavy fractionated distillation products from coal tar. A well-prepared mastic should guarantee durable and sufficiently flexible sticking of the plank to both the concrete substrate, and wooden. It should only soak up superficially. If the floor is properly laid on a previously leveled substrate, it should be flexible within the temperature range from 5 do 40°C, however, it should not be pasty and squeezed out from under the floor. It should be odorless and free of volatile components harmful to health. When used at a temperature higher than 10 ° C, it should be easy to spread with a layer from 1 do 2 mm with the help of a putty knife on the cleaned one, the dry surface of the substrate, the water content in the mastic must not exceed 2%, weight of the mass. Research on the viscosity and its essential values, the properties necessary for the application should be made in accordance with PN. Flooring mastic is used cold or slightly warmed to bind the wooden floor to the substrate. When installing a plank floor, at the thickness of the mastic layer from 2 do 3 mm wear is from 1,75 do 2,25 kg in 1 m2 of the ground surface. Lepiki, just like tar, then, bitumens and derivatives can be stored in free space, however, in summer, they should be placed in shaded places, the drums or barrels should be placed with the opening facing up, regardless of the hardness and softening point of the materials.