Help please, strange 'wet spot' problem. Damp? Condensation?

[benw456]

After finishing the renovation of my end terrace, strange spots have appeared along the gable wall about 3 foot from the floor.

The spots have appeared where the plasterboard has been dabbed to the wall.

I need them gone now but I firstly need to know what is causing them and what I can do to get rid of them.

the back room in the house is connected to the kitchen and when cooking anything that produces steam - the spots get wet and drip somtimes!

Anyone have any ideas?

Pictures:

Ben[/img]

 

[noseall]

Cold bridging (thus condensation) due to lack of insulation.

 

[benw456]

Thanks, what (if anything) could I do to get rid of it?

Cheers

 

[noseall]

Fit insulation behind the plasterboards.

 

[benw456]

Bugger, thought you might say that. So its all back to brick again?

What insulation would be best to use?

Would cavity wall insulation help in any way?

Im quite a novice to building so all your info is greatly recieved.

EDIT:

Just found this:

http://www.british-gypsum.com/produ...es/gyproc_thermal/gyproc_thermaline_plus.aspx

Could I strip back my existing plasterboard and reboard with this?

Cheers

 

[benw456]

Anyone? Wouldnt mind getting started on this.

Cheers

 

[noseall]

A typical 1 brick thick (225mm) wall would require 40mm of celotex type insulation to meet current reg's.

If space is a premium then go for the insulation that gives the greatest thermal resistance whilst being practical.

Do you intend dabbing direct to the wall or are you battening first?

 

[JasonF]

I would try polstyrene wall veneer, buy it from homebase although only 2mm thick it makes a big difference its only about £ 4 per roll. I used good old PVA glue and a roller Its a bit fiderly to start but once you get used to hanging it, its easy. I also found hanging wall paper over it was really good no air bubbles, Its worth a try.

 

[tony1851]

although only 2mm thick it makes a big difference

If it's polystyrene and only 2mm thick, how can it make much difference?

 

[JasonF]

condensation settles onto a cold surfaces causing damp patches, the polystyrene when up is warm to touch, it does work. I have used it on a few walls and its made a big difference also it gives a nice smooth surface to wall paper over.

 

[benw456]

Thanks for the replies!

If i used the polysyrene method then I can paper over the top?

Would having cavity wall insualtion fitted be ok?

The gable is a double brick wall with a 30ish mm gap in between the courses.
Cheers

 

[r896neo]

Nobody will pump a 30mm cavity.

 

[JasonF]

I would try the polystyrene wall veneer, it worked for me, What ever method you use for insulation if you have got poor ventilation in the house you are going to have problems with condensation and damp patches. Sorry but you could cure the problem wall and the condensation will find a new home, I know because I went through this when we changed the windows to plastic double glazing, we had more condensation because the house before had good ventilation through the old windows. So I Installed an extractor fan into the bathroom. put an air vent in the living room and a couple of bedrooms and during the warmer months leave the upstair windows open. Problem solved.