HELP what can we do about this condensation problem???????

14 replies
Found 9th Nov 2008
Hi we are currently converting our homes outhouses into a room and have just noticed we have a lot of horrid condensation behind the plasterboard, we have plastic sheeted then framed, then added insulation then covered it all with plasterboard ready to plaster, but the condensation is between the plastic sheet and the insulation?????? help please is this normal, will it stop what can we do to stop it??????????????? And advise will be greatfull received

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14 Comments

Original Poster

oh yes its a flat roof above, and we are planning on adding a radiator, and there are two windows in the room if that helps

if u renting tell ur landlord otherwise u probably need to sort it out maybe something to do with the bricks

You're suffocating the wall....it can't breathe. It's called Interstitial Condensation....You need to add a vent

I feel for you I really do. We just had a survey done in one of our rooms due to a condensation problem. They told us to move our radiator from under the window, and also to install a new window as it didnt have a vent on it. Hope you get it sorted soon

Original Poster

I cannot add a vent as the condesation is in the ceiling NOT the walls there is a permiable membrame on the ceiling and then insulation then plasterboard.the room has no rad at the moment but it will have come tuesday.

helen_15;3416370

I cannot add a vent as the condesation is in the ceiling NOT the walls … I cannot add a vent as the condesation is in the ceiling NOT the walls there is a permiable membrame on the ceiling and then insulation then plasterboard.the room has no rad at the moment but it will have come tuesday.



have you tried a dehumidifier-i know they work really well for drying plaster etc...better than heating. Once had a house plastered and honestly emptied a massive tank of water every day!
worth hiring i would say..

The plastic sheeting is the problem. You should not have put that in, it is trapping moisture. I assume the walls have no cavity, so you need to introduce ventilation from the outside. Air bricks
at low level and cut through the plastic sheeting so the air can get through. You also need to check if there is a damp proof course in the brickwork, otherwise rising damp in the outside bricks will feed the condensation. Trapped moisture can lead to dry rot, which you don't want, so ventilation is essential.

the ceiling is sweating and the plastic membrane isnt helping matters where you told to use the plastic membrane? i dont think the rad will help matters, if anything could make it worse. i would lose the plastic sheeting. i could understand if the walls had the sheeting as ive seen it done before but never in a ceiling.

sorry, just noticed you say it is in he ceiling not the walls. Same principle applies though. You must ventilate or you will get rot.

Original Poster

davej;3416541

the ceiling is sweating and the plastic membrane isnt helping matters … the ceiling is sweating and the plastic membrane isnt helping matters where you told to use the plastic membrane? i dont think the rad will help matters, if anything could make it worse. i would lose the plastic sheeting. i could understand if the walls had the sheeting as ive seen it done before but never in a ceiling.





The plastic sheeting is a permiable membrane, which is what we have been told to use, so as I understand it this allows breathing but prevents water coming through, the condensation is on the inside of the sheet (inbetween the sheet and the insulation) what would removing the sheet do?? sorry to sound super think just trying to get as many answers as poss. we have just removed some plasterboard from the walls to check them and they are dry, dont know if that helps

is the permiable membrane fitted the right way around? and is your insulation the correct type to be fitted with the membrane? if you have been told to use this then who ever told you to use it should have the answer. better to sort it out now rather than later

davej;3417282

is the permiable membrane fitted the right way around? and is your … is the permiable membrane fitted the right way around? and is your insulation the correct type to be fitted with the membrane? if you have been told to use this then who ever told you to use it should have the answer. better to sort it out now rather than later



good point, would have thought a semi-permeable membrane was more appropriate here, this lets moisture travel one way but no the other so must be fitted the right way round.

Have a search on this website...
greenbuildingforum.co.uk

The guys there are really clued up and will give you loads of help if you ask questions. Do search and read posts first though as there will no doubt be others that have went throgh similar.

Original Poster

Thanks for all your ideas, the problem is now sorted it was just simply the room drying out, once we fitted the rad and turned the heating on with in two days room all dry, so now carring on turning it into our new kitchen.
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