Using expanding foam as cavity closer?

[garyo]

Hi guys,

I have a cavity around my new bathroom window that wanders between 40mm and 50mm. The cavity is filled with polystyrene beads. Rather than faff modifying a proprietary cavity closer, is it acceptable to use expanding foam?

i.e. is the foam non-porous and therefore won't form a damp bridge, and to me it feels strong enough to take the 'adhesive' when I dry-line the reveals?

Cheers

Gary

 

[^woody^]

Yes, you can use it

 

[garyo]

Cheers woody - music to my ears!