Before the Dehydration
This building is a typical Scottish "4-in-a-block" type residential property. The owner of the lower flat has been having ongoing problems with dampness and mould, the typical signs of condensation. Despite all remedy efforts the situation did not improve only got worse. The property has been received a chemical damp proof course years ago.
After performing a professional dampness survey the source of the problem has been identified as rising damp. After analyzing all the options, the customer has decided to handle the rising damp problem with the Aquapol masonry dehydration system because it was non-invasive.
The Aquapol System - Results
The Aquapol system has been installed in December 2013. The starting moisture levels have been determined from drilled samples taken from the core of 3 wall sections (denoted as M1, M2, M3). Regular follow-up moisture measurements have been taken at about 6 monthly intervals to track the progress of dehydration. The results are presented on the chart below:
M1: It can be seen that during the first 6 months, the moisture content has dropped significantly, from the initial 8.1% to 1.5%, which is dry. The change was visually noticeable, the color of the walls became lighter. The mould growth has stopped without any additional action. The damaged wallpaper has been removed from the lower part of the wall to facilitate the dehydration.
M2: After 6 months there was relatively little change at M2, the point where the moisture values were originally the highest. This wall had a tap on the other side of the wall used for watering the garden, however at the time of installation there was no sign of visible leaks. At the 6-months check, with the dehydration stagnating at this point, the Aquapol engineer has done a thorough investigation and discovered ANOTHER tap at the main waterline, which was leaking. This leak kept the wall from drying out. The leak problem has been addressed promptly.
Another set of measurements have been taken four months later and the moisture values at this point have dropped from 17.2% to 7.5%.