WHAT IS CONDENSATION?
is one of the most common forms of dampness in residential buildings. It is largely caused
by modern living standards and building design. Moist, warm air from activities such as
cooking, washing, bathing or even just breathing will ultimately condense on (and
sometimes in) colder surfaces in the house, the temperature at which this happens is
called the DEWPOINT. On average each person produces about 4 pints of water vapour each
day just from breathing, washing, cooking etc. Therefore a family of five will produce
about 20 pints a day; this equates to 140 pints of water vapour a week!
will be much higher with activities such as using: -
portable gas heaters
clothing indoors or on radiators
AND WHERE DOES CONDENSATION OCCUR?
can occur at any time, but is more likely to occur at night because the air temperature
drops (when your heating switches off) causing humidity to rise. Also many surfaces in the
home (particularly the external walls and windows) become colder and this lowers the
dewpoint temperature to these areas. The most commonly affected areas are moisture to
windows, mould growth to walls/ceilings particularly behind curtains, corners of rooms
behind beds/pieces of furniture
heating/insulation all help to increase surface temperatures, however this generally does
nothing to remove the problem and can be very costly.
2. Reduce the
input of moisture! This would be fine if everybody in the house could hold their breath
for long periods of time!
measures would be to close bathroom/kitchen doors when bathing/cooking and not to use
portable gas heaters.
3. The use of
a dehumidifier will help to control A SYMPTOM of the problem, but they can be noisy and
cost around 2.7 pence per hour to run.