Our daughter has moved into a converted flat. When I viewed the place
with her I noticed there was polystyrene behind the wallpaper. The
"builder" showing us round said:
"Obviously thats there since we've cured the damp".
Three weeks down the line the damp is anything but cured, their view
is "Its condenstation", which reads like damp to me.
Surely if a wall is damp the last thing you do is seal it in with
something impermeable? If the damp was cured then why slap polystyrene
Could be a cold wall encouraging the condensation to form, so putting
polystyrene is an attempt to insulate the surface from the cold wall,
and reduce condensation forming on it?
It does depend whether the it really is damp or condensation though.
Extractor fans in bathrooms, window open while cooking in kitchen,
ventilation overnight in bedrooms etc all help reduce condensation
problems. Keeping the place shut up tight can lead to very bad
condensation problems cos the damp air doesn't dissipate before the next
load is generated, and just builds up further and further. Damp needs
the root cause finding and rectifying.
email@example.com (BJ) wrote in message
IMO it's not a totally unreasonable thing to do if the problem is
genuinely condensation - what it does is reduce the temperature
gradient between the moisture-laden air and a cold surface (if that's
what you've got). Improving the air circulation would be a better
However, if you've got genuine 'damp' whether penetrating or rising
(whether or not that exists!) then you're right - polystyrene sheeting
or tiles are nothing more than camouflage.
The windows don't need to be wide open, just open a fraction all day if
This weather would actually be good time to try it, we've got dry
northerly winds forecast for several days, which should stop existing
condensation and help dry out the structure of the building.
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