Condensation behind drylining

Fleebog123

New Member
Hi all, I'm in the process of drylining my bedroom and I'm having an issue, the external gable wall is solid with no cavity and has been rendered on the outside with no insulation as space was a factor, so on the inside I've gyp lined the wall and used insulation backed plasterboard, after a while I noticed there was a wet patch coming from the bottom of the plasterboard and when I've taken off the boards the surface of the wall behind was saturated with water, I was just wondering the best way to prevent this, also it might be worth mentioning that there are radiator pipes running behind the gyp lined wall.
I've included a photo
 

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Deleted member 32554

Guest
Did you not insulate the pipes
Hi all, I'm in the process of drylining my bedroom and I'm having an issue, the external gable wall is solid with no cavity and has been rendered on the outside with no insulation as space was a factor, so on the inside I've gyp lined the wall and used insulation backed plasterboard, after a while I noticed there was a wet patch comi
 

themucky1

Well-Known Member
Hi all, I'm in the process of drylining my bedroom and I'm having an issue, the external gable wall is solid with no cavity and has been rendered on the outside with no insulation as space was a factor, so on the inside I've gyp lined the wall and used insulation backed plasterboard, after a while I noticed there was a wet patch coming from the bottom of the plasterboard and when I've taken off the boards the surface of the wall behind was saturated with water, I was just wondering the best way to prevent this, also it might be worth mentioning that there are radiator pipes running behind the gyp lined wall.
I've included a photo
This is the problem with insulating internally, your dew point is on the inside of your property due to the cold temperatures penetrating the substrate and the warm temperatures from inside the property. Had you insulated externally the dew point would be outside on the face of the rendered finish
 

Fleebog123

New Member
This is the problem with insulating internally, your dew point is on the inside of your property due to the cold temperatures penetrating the substrate and the warm temperatures from inside the property. Had you insulated externally the dew point would be outside on the face of the rendered finish
I know, it was just down to space as I couldn't have the external wall coming out any further
 

Fleebog123

New Member
Did you not insulate the pipes
I did think that was the problem, the pipes were getting hot and causing condensation, but the pipes aren't on at the moment as I'm having a new radiator on that wall so the pipes are capped off and don't get warm as of yet, they must be filled with air, but I realize that would be a problem so I'm going to re-route them under the floor to be safe, the only thing I can think is were the radiator pipes were coming through the insulated plasterboard, warm air was travelling through the holes and condensing as I spoke to celotex and they said the insulation has to be air tight
 
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