Cavity closers

Joined
5 Nov 2019
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United Kingdom
Hi folks,
I'm refurbing a room in a modern timber framed house that had a window put in after it was built.
The window reveals in this room started showing signs of mold so decided to ripped them out.
There was no closer just a piece of foil backed plasterboard that sat on blobs of adhesive to isolate it from the brickwork.
The mold on the reveal matched exactly the shape/location of the cavity.

I'd like to close the cavity and then use a membrane to seal it (probably Intello) once the window has been replaced and then a tile backer board.

What's the method of closing the cavity on modern timber frame?

I've looked at the plastic cavity closers, these are normally used on masonary walls but would these work for timber frame as long as the polystyrene insulation is cut back so there's no moisture transfer between the brickwork and the OSB?
Window.jpg
CavityCloser.jpg
 
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