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Leaving 50mm void for bathroom insulation?

Postby Discodave30 » Sat Jun 05, 2021 12:02 pm

Doing a bathroom, battened in front of brick (cavity)
3 x2 CLS using a eps backerboard.
Insulation wise do I need to leave a 50 mm void, given that my studs plus gap is 70mm.
Or is that for single brick external wall?
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