What are your thoughts? Before I replace the wood I'd like to know if I need to take the window out and line 'insulate' the wood from the aluminum window frame.
Thanks in advance.



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grahamhowe: Oh, I thought 'membrane' was builders speak for the wood frame that makes up the wall, this is what I mean by membrane is the wood framing wall :-)
I will post a wider shot of the windows this evening. The only rot is in this corner as per the photographs but yes you're right I'll offer more context.
Back soon. Thanks.
Glassboy:In this context I think you're meaning a moisture proof material that goes under the external cladding.
grahamhowe: [snip] I should re-clad the whole house with proper weatherboarding instead of this 80's fibre cement boarding.
wellygary: The reason the wood is rotting is because there is no "membrane" between the window frame and the exterior caldding
gzt:wellygary: The reason the wood is rotting is because there is no "membrane" between the window frame and the exterior caldding
Very unlikely. Many older houses used similar construction methods and do not have rot around the windows from condensation. It is far more likely there is a minor issue somewhere which is allowing a fair drip of moisture into the cavity every time it rains. Some wider photos are required to educated guess at where that might be. Could be the window itself but there are many other possibilities. For instance a nail worked out of it's hole in the external cladding in exactly the wrong place can be the cause of things like this if left for a few years.
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