Can anyone give me an approx cost of dry-lining and plastering the 4 external walls and plastering the ceilings of a double fronted 2 story detached 1500sq ft house.
you should consider the rooms RH carefully. In a house with poor ventilation it could be over 80% , in a normal house that could be maybe 50/60%, where as for the external RH see [broken link removed]
one of the old school ways is by using the psychometric chart along with assessing the dew point using the Glaser Method (IS EN 13788 (2002)
Joseph little has done work on dry-lining & dew point analysis relevant to Irish conditions. especially worth a look if your not bothered doing you own calcs under varying RH & temp conditions
[broken link removed]is a more accurate piece of software that calculates the hydrothermal value under varying conditions http://www.wufi-pro.com/
and here's an American view point just to confuse the situation