I am working on a wall which may have rising damp, it appears to be so as it
has been treated twice before bthe treatment failed twice within 2-3 years.
nowhere else is damp in the house.
The wall is in a one storey extension at the side of the kitchen. the sign
of damp is on the internal wall only but not on the external one. what
tests can I do to determine whether this is really rising damp rather than
condensation (kitchen is hot, extended area is always cold and the outside
wall is north-northwest facing.
Also, what steps can i make eliminate damp (if it is that) or condensation.
Would vents and heating help? - there is neither at the moment.
Fix a mirror on the wall. If the front is damp you have condensation, which
sounds the most likely, especially if you have a solid floor. IME moving the
radiator to the furthest (coldest) point is the only real cure.
The fact that the "damp" treatment hasn't worked suggests it is falling
or penetrating rather than "rising damp".
There is a simple test. Make a sausage of putty. Form it into a ring,
and press a small piece of glass flat onto it. If condensation forms on
the outside of the glass, then its coming from the air, if condensation
forms on the inside of the glass, then its coming from the wall.
Both will help, but ventilation is the more important.
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