Article | REF: C7125 V1

Roof terraces: pathology of water tightness

Author: Claude SAINT MARTIN

Publication date: November 10, 2008

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5. Thermal insulation for terraces

5.1 Insulation

On terraces, thermal insulation is provided by a number of products, including :

  • expanded polystyrene – (EPS) – λ = 0.037 to 0.046 ;

  • extruded polystyrene – (PSX) – λ = 0.031 to 0.036 ;

  • polyvinyl chloride – (PVC) – λ = 0.031 to 0.034 ;

  • polyurethane – (PUR) – λ = 0.020 to 0.031 ;

  • cellular glass – λ = 0.050 ;

  • vermiculite, perlite – λ = 0.060.

Good thermal insulation has a very low λ coefficient; polyurethane foam (PUR) with λ = 0.020 to 0.031 is currently one of the best insulators. Other,...

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Thermal insulation for terraces