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8. Air gap analysis
We often speak of a ventilated air space as the potential solution to a pathology whose cause lies in the condensation of water vapour. This stems implicitly from the common belief that wet linen lying outside dries faster in windy conditions.
A distinction is made between unventilated and ventilated air gaps. The following are considered :
unventilated, air gaps, either without contact with the outside (see § ), or air gaps where the surface area of the openings bringing them into contact with the outside is less than 500 mm 2 per linear metre (ml) of facade;
The surface area of the openings that bring them into contact with the outside is between 500 and 1,500 mm 2 per ml...
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Air gap analysis
Comments
Standards and norms
- Building work – Restoration of facades in service using polymer-based waterproof coatings – Part 1-1: Technical specifications – Part 1-2: General material selection criteria – Part 2: Special clauses – Commercial reference for parts P 1-1, P 1-2 and P 2 of NF DTU 42.1, November 2007 (classification index: P 84-404). - NF DTU 42.1 - 2007
- Paints and varnishes – Paint products and coating systems for exterior masonry...
Statistical and hygrothermal data
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Readings from Météo France
Météo France has departmental centers throughout France, which are able to provide climatological information on the location of the building, which must be the subject of a hygrothermal study.
On written request, each center provides climatic data (temperature and relative humidity) at the desired intervals....
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