Given that only the flooring by the wall is affected, underlay is unlikely to resolve the issue. It's more likely conduction from the wall that's causing the temperature of the adjacent flooring to drop below the dew point. Try remove some skirting board and see if the flooring is in contact with the wall.To try get rid of the last bit of condensation we are considering two things. In both cases we plan on taking up the floor and changing the underlay to the most insulating one we can find.
Hi Leo,Given that only the flooring by the wall is affected, underlay is unlikely to resolve the issue. It's more likely conduction from the wall that's causing the temperature of the adjacent flooring to drop below the dew point. Try remove some skirting board and see if the flooring is in contact with the wall.
What ventilation do you have in that room?
Hi,Hi RonanOS,
Have you had your cavity walls checked to ensure they have proper insulation?
Like you we had a cold and damp room in the house with two external walls. We tried various things to address it. Bear in mind this isn't an old house, it was built in the late 1990's within a housing development.
A number of years ago we had a BER assessor check there was cavity insulation and he was able to do a visual check by looking down the walls from the attic. There was fibre insulation present in the cavity. So, we discounted that as the issue.
But the cold/damp issue continued. We did other things like upsize the rad in the room and upgrade the window to triple-glazed, but it made no difference.
This year we had a guy drill a few holes in the gable wall and stick a camera in. We were shocked at what we saw. While the builder did pump in fibre into the cavity, it was just fired in and not evenly applied or packed in. There were gaping holes with no insulation and places where we were able to look straight down the inner cavity to the base!
These big gaps of no insulation corresponded to the parts of the wall that were cold and damp. Essentially, the walls were colder, leading to any moisture in the house reaching its dewpoint and condensiing on that colder inner wall, causing moisture, dampness, mould and a fusty smell.
Spoke to the neighbour across the road when I saw a company doing work on his walls and it turns out he had the same issue as us and he said a number of houses in the estate also have the same issue. Shoddy workmanship by the developer. The issue was addressed by getting the old insulation vacuumed out and replaced with a modern bonded bead system (or similar). Apparently the change to the entire house was immediately noticeable.
We are booked to get ours done in January.
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