Thermal insulation made from extruded polystyrene has a closed, cellular (sealed) structure, while the wool fibers are located randomly in the horizontal and vertical direction. Thermal insulation made from extruded polystyrene foam is moisture, when the mineral and basalt wool in the definition of “cotton wool” pass moisture and absorbs it into itself, only some of the brands of mineral and basalt wool “Almost” do not absorb moisture, and it is quite important for the roofs, because with increasing humidity insulation material deteriorates its thermal performance. Thermal insulation made from extruded polystyrene possesses high compressive strength and flexural strength and is suitable for use under high load, which confirms the application of extrusion plates in thermal insulation of foundations and roads, railways and runways airfields, mineral wool which will have similar characteristics of strength, should weigh about 180 – 200 kg / cubic meter. Thermal insulation made from extruded polystyrene has no shrinkage during the whole period operation, the same mineral wool will shrink after installation, can not at once, for 2-3 year of operation, but still will shrink, which invariably affect the quality of the roof.
Thermal insulation made from extruded polystyrene is not corrodes the metals, and various fasteners, screws, galvanized steel profile, in contrast to thermal insulation of the wool. Any fiber board – is an aggressive environment in their manufacture are used phenol-formaldehyde resin, urea resin, which is under the influence of ultraviolet light and moisture allocates ammonia and amines. Ammonia reacts with a zinc coating, the interaction of wet fiber board made of mineral or basalt insulation for example with zinc sheet – zinc coating oblezet. The only argument in favor of the thermal insulation of mineral wool and basalt – a fire-quality wool. Products made of mineral and basalt insulation have a group of combustibility ny (incombustible), products of the same extruded polystyrene have a group of combustibility G1, for this the last straw has been seized upon by many manufacturers of cotton wool. Cotton producers launched a defamation extruded polystyrene on the roofs on fire characteristics, no more arguments. It’s not quite a serious argument, since the fire safety design is defined as a whole, rather than separate layers. Enough producers of extrusion plates to obtain conclusions about the fire safety of different roof structures, which include those of the insulation panels of extruded polystyrene foam – arguments will not. Well, prices do the trick. Thermal insulation made from extruded polystyrene insulation costs less than mineral wool and basalt. This is one of the most powerful arguments for choosing the material for the roof, everyone thinks the money.