The roof system of a density about 60 kg/m3 is mostly used as thermal and hydro insulation for:
- flat, made of concrete roofs, from the top,
- under pavement layers of insulation

The creation of a thermal insulation in the case of this system depends on the thickness of foam.
This system is closed cells, with applications to flat, made of concrete roofs, is not necessary to remove and dispose of the old sheathing, the adhesion to the substratum with asphalt sheet of roof is> 150kPa, often can be eliminated to use roof flashings. Strength of 350kPa allows walking freely on the surface, without fear of damage. Because polyurethane foam is not resistant to UV rays, it is necessary to safeguard the special layer of paint, intended to come into contact with the polyurethane foam. Coating after drying, it must keep the property in the event of a flexible roof to keep dilatation leakproofness surface. A layer, is a final layer of lacquer . Another solution is the use of polyurea elastomeric coating, but it's much more expensi