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Second home, old village house south of Perpignan. No foundation, sloping street so the bottom of the 2 main rooms is below the sidewalk level. House recently renovated by professional (roof and 2 fronts, the others nested with the neighbors) The walls of the bottom thus manufacture saltpetre. For the partition wall (perpendicular to the bottom) the exposed stones allowed the wall to breathe and solved the problem. I am considering buying a Hygrostop HG20 Wall Drying Plant. The concept is attractive. What about reality?

In recent times, we have witnessed a proliferation of "electronic" processes claiming to fight against capillary rise in walls by "inversion of polarity of masonry" or similar explanations. Most of these systems are not based on any reliable and recognized scientific and technical demonstration... But as you say, they are "attractive"... and always very expensive! However, the process is scientifically proven and even used in civil engineering (for the drying of walls in railway tunnels.) It is still necessary to find the reliable company in this field...

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