4. Example

Waterproofing of roof terraces for pedestrian traffic with single-layer membranes protected by slabs on blocks:

• concrete support ;

• vapour barrier: this consists of a polyethylene film at least 300 microns thick, laid in a single independent overlap and bonded with a prefabricated adhesive cord sealant;

• thermal insulation :

  • Class C expanded polystyrene panels weighing 25 kg/m ² , covered by a Cahier des charges or Avis technique,

  • adequate crush resistance,

  • thickness e according to desired strength,

  • lambda (λ) = 0.035, giving the coefficient R = e/λ (m ² ...