3. Vapor barrier and thermal insulation

When roofs and flat roofs are waterproofed, they are usually insulated at the same time, with sheets of insulating material:

• expanded polystyrene ;

• polyurethane foam ;

• Foamglass ;

• mineral wool ;

• etc.

A complete system is therefore installed, as shown in figure 6 , comprising the following elements, starting from the load-bearing element: