Cavity Closers with inner outer wall variations

[AFT4B]

We have a bit of a mix of new window/ door openings and one external doorway where the new wall joins an old wall.

The the new build in some areas has a variation of 10-15mm between the brick and blockwork so the cavity closer would not sit completely flush. I'm not sure what the normal tolerance is but I'm trying to think ahead to plaster boarding/ plastering for a clean square finish on the reveals.

I was thinking of adding some expanding foam behind this to get the cavity close to fit level. Is there a better way?
(Or would this normally be fitted as is and the angle corrected with bonding/ dot and dab on the plasterboard?)

 

[noseall]

We have a bit of a mix of new window/ door openings and one external doorway where the new wall joins an old wall.

The the new build in some areas has a variation of 10-15mm between the brick and blockwork so the cavity closer would not sit completely flush. I'm not sure what the normal tolerance is but I'm trying to think ahead to plaster boarding/ plastering for a clean square finish on the reveals.

I was thinking of adding some expanding foam behind this to get the cavity close to fit level. Is there a better way?
(Or would this normally be fitted as is and the angle corrected with bonding/ dot and dab on the plasterboard?)

View attachment 405941

Dab a strip of plasterboard on first, prior to fitting the cav closer.

 

[AFT4B]

Dab a strip of plasterboard on first, prior to fitting the cav closer.

So add now before the closer is fitted rather than after? Or can it be done either way?

Also, what's an acceptable tolerance to not need doing this? As I may end up with the closer protruding more on the inner wall if I do this and it's not required. If you get what I mean?

 

[^woody^]

Air leakage is the main thing to consider, so make sure however you do it, the cavity is properly sealed.

 

[AFT4B]

Air leakage is the main thing to consider, so make sure however you do it, the cavity is properly sealed.

I will be fixing it in place with general grab adhesive and clout nails on the inner walls.

Perhaps I'm needlessly concerned about making it completely level at this stage?

 

[noseall]

So add now before the closer is fitted rather than after? Or can it be done either way?

Also, what's an acceptable tolerance to not need doing this? As I may end up with the closer protruding more on the inner wall if I do this and it's not required. If you get what I mean?

Pre-closer.