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You could insulate it as you'd only loose a bit of storage space. I would use MR MDF, finish in a mould resistant paint, and keep some sort of air flow path.
My guess would be that as long as other bricks can pull moisture then it shouldn't be critical.
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I want to build a window seat with storage underneath in a large square bay that is single skin brick and am having worried about damp / condensation if it stops airflow
We're doing this in our bay window, which currently has damp patches on the inside wall.
First task is shoring up the outside (sealing the gaps between windows & mullions, repainting, adding a French drain around the base of the wall, grinding a fall into the window cill and adding a drip groove).
To keep the inside dry, I'm lifting the floor to clear up any crap between the joists, any dwarf walls and the outside wall, and making sure that the air bricks are completely clear. The rout out a vent in the floor itself.
I've asked the people building the cabinet (diyalcovecabinets.co.uk) to leave enough space between the boxing and the wall to ensure airflow.
Fingers crossed, it will be enough. If not, I'll try adding vents to the top of the seat itself.
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hugo7
NotThamesWater
@andyfallsoff
I want to build a window seat with storage underneath in a large square bay that is single skin brick and am having worried about damp / condensation if it stops airflow - has anyone considered this sort of issue and is the better answer likely to be ventilation or putting internal insulation between the brick and the storage space?