Retrofitting cavity closers

[ChrisJLW]

Hi all,
Hopefully a quick question. Is it possible to fit cavity closers with the window in place?

The cavity is about 60mm wide and I can feel some lovely big blobs of filler foam round the edges of the window. So I imagine it could be quite difficult to get one in there.

As these are french doors I'm very reluctant to just fill the gap with foam as the dpc bridging properties of the stuff seems to be in question.

I'm tempted to leave it until the summer, remove the whole thing and then install the cavity closers.

Any other alternatives that y'all can suggest?

Ta muchly.

 

[noseall]

Any other alternatives that y'all can suggest?

I'd hack off the reveal plaster, to give slightly better access, hopefully leaving the corner bead in place. Get some100mm dpc, and carefully squirt polymer sealant down brickwork and stick the dpc onto the masonry. Then we'd wet the the dpc with a water spray and squirt plasterboard foam adhesive onto the dpc and feed in a slender piece of PIR (25mm?) onto the foam. Wait for that to cure then foam the gap this side.

Massive faff, but mask the door upright first.

 

[robinbanks]

I'm very reluctant to just fill the gap with foam

I recall reading that can based expanding foam is open cell, and hence can absorb some water, whereas board based stuff is closed and much more resilient to it; are you willing and able to remove the door and close the cavity off with a well fitted slice of kingspan?

 

[noseall]

are you willing and able to remove the door

I wouldn't go down that route, especially for a set of French and a combi frame - that's foamed and siliconed in. Not a prayer.

 

[noseall]

I recall reading that can based expanding foam is open cell, and hence can absorb some water, whereas board based stuff is closed and much more resilient to it; are you willing and able to remove the door and close the cavity off with a well fitted slice of kingspan?

Foaming would work. I'd still mask up though.