It is a type of sloped roof in which the tiles are applied on wood strips to create an air cavity of about 2 - 4 cm in thickness between the insulation layer and finishing layer. The ventilated air chamber between the tiles and insulation prevents condensate from forming under the tiles and that the roof heats up too much due to exposure to sun radiation.
Laying: a vapor barrier is applied on the roof's cement slab, which is to be perfectly smooth. The POLIISO^® SB expanded polyurethane panels are then laid by arranging them diagonally compared to the slope's direction. The panels are to be laid from the eaves to the ridge. The panels are to be laid over a layer of about 1.5-2 kg/m² of bitumen spread evenly over the surface. Mechanical fastening is also possible.  The waterproofing membrane to ensure water tightness is flame-applied on top of the insulation layer, thus bonding to the bitumen on the part facing the panel's extrados. The wood strips are then fastened in the direction of the slope's gradient by means of screw anchors long enough to cross the cement slab by about 3-4 cm. The horizontal strips are fastened on the first series of vertical strips using corrosion-resistant metal nails. The distance between the strips is determined by the pitch of the tile selected.