Firstly, insulation boards made of extruded polystyrene foam should be installed in one layer on top of the waterproofing. It is important to ensure that the edges of the boards fit snugly. The lowest recommended slope for inversion roofs should be two percent. This is necessary so that water can drain freely into drainage structures..
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When installing insulating boards, geotextile material is able to provide them with additional protection from the adverse effects of ultraviolet radiation, as well as from various mechanical influences. On top of the geotextile, a drainage layer of gravel of 16×32 mm should be laid, the thickness of which should be 5 centimeters, and it should be determined taking into account the correction for the strength of the wind. Instead of gravel, concrete slabs or paving slabs are an alternative. During storage and transportation of boards made of extruded polystyrene foam, certain measures must be taken to ensure the safety from mechanical damage, as well as sunlight and precipitation. Constructions of inverted roofs make it possible to operate them and can be performed as a roadway or a terrace (for example, a roof of a parking lot).