On 18/02/2021 12:49, R D S wrote:
I'm boarding the inside of a window but noticed a gap at the top where
there's a fascia panel attached to the window frame but not the building.

Given it would be a faff to fill and it's in the rebate i'm wondering
whether to bother, the only issue I can see is it's letting air into the
cavity, which is no real bad thing?

https://drive.google.com/file/d/1ODJ...ew?usp=sharing


https://drive.google.com/file/d/1O8r...ew?usp=sharing



Did someone get their window measurements wrong ?.
Normally you allow 5mm tolerance all round.

Personally I would have raised the cill up with cut
bricks or blocks and fitted the window flush up against
the lintel.

I'd be more concerned with that horizontal crack.