Hi
I have just had installed a large arched single double glazed upvc unit, ground floor into stone wall

2410 wide 875mm high to curved section they n further 295mm in the curve (so its oblong with curved corners and top.

The issue i have is that when its windy it creaks and make a squeeky kind of sound, same when you gently push the glass either internally or externally.

The glass is Pilks KS Optiwgite TUFF Swisspacer white Argon (copied from spec sheet)

Can anyone tell me what thickness of glass should have been used and what be causing the noise
Thanks for any help offered
robin