Pathology of dampness - Simple wall - Common examples

The hygrothermal study of a simple wall (16 cm concrete veil, see [C 7 132] ) enabled us to understand its behavior in the face of the aggressions of natural agents such as heat and water, acting separately or together in all their forms.

In this dossier, we'll be looking at the "calculation notes" for a few simple walls, commonly used in residential and/or industrial building construction, and their corresponding "Glaser diagrams" for the winter period.

Following, a few comments will explain the dominant potential pathology of walls made mainly of hollow breeze blocks, aerated concrete, solid or hollow brick, semi-firm limestone, hard limestone or hourdage joints.

The climatic conditions used in this dossier are as follows:

• in winter :

  • outdoors: T _e ≥ – 10 °C and HR _e ≥ 90% or 95%,

  • indoors: T _i ≥ + 19 °C and HR _i ≥ 60%;

• in summer :

  • outdoors: T _e ≥ + 40 °C,

  • indoors: T _i ≥ + 24 °C ;

• in mean reference temperature :

  • outdoors: T _e ≥ + 15 °C,

  • indoors: T _i ≥ + 22 °C.

They can be used to calculate thermal shock under extreme hygrothermal conditions applicable to the whole of France.