DIY Doctor

Help With Condensation and Seeping Water in Window Reveals

Postby JohnoWhits » Mon Dec 31, 2018 12:45 pm

We bought a cottage (1903) last year and are slowly working our way through the rooms. We have gutted our bedroom and had it re-plastered.
The window board used to be tiled and would be covered with water in the morning.

We have had brand new windows fitted and the internal exterior walls insulated (we think ultimately we will need the rendering/insulation sorting externally). When our plasterer did the insulation he couldn't do around the window reveals as there was not enough space between the reveals and the new windows.

We currently have soaking window reveals; this isn't just in the morning; it can be any time of day.

I'm assuming there is a thermal bridge here where the reveals are the coldest point. I'm also unsure whether water is seeping through the external wall.

We have checked for gaps outside of the windows and in the attic to check for anything leaking down.

It's currently making a mess of the brand new oak window board and we're worried it's going to ruin the wood. We also can't move on with finishing this room till this is sorted.

We've tried having the windows on the latch; the door open at all times; a de-humidifier but nothing seems to work.

Our plasterer couldn't offer a solution, nor the carpenter.

We just don't know who we need to come and look at this and help us find a solution.

Please help!
JohnoWhits
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