I'm no expert - but the use or non-use of Acrow props during installation is meaningless if they've fitted uPVC windows to a structural bay window. Unless they're steel reinforced. Are they? The damage will be done during the following months and years of being inadequately supported.
Nozzle
Thanks for your response.
I'm going by the following, the Glazing company insist that they used them, they didn't. We have some pics taken during installation (we were focused on something else that was incorrect', but we we'ren't aware that they had to use them on 'bay windows' as per the Guide:-
The GGF's Installation Guide - Building Regulations (attached - page 13) states the following -
'Removal of bay windows In order to maintain the structural integrity when replacing a bay window, it is essential that temporary supports such as adjustable steel props are used. It is important to ensure that the walls, floors or
beams that may be affected by the window replacement are adequately supported prior to removing the windows.
Care should be taken to protect internal ceiling and floor finishes at support bearing points. The sequence of removal of the windows in a two storey bay should ensure that unnecessary damage to the lower bay construction does not occur and structural stability is not impaired. It is important that the structure is always adequately supported.
After supporting the bay structure, the windows should be removed carefully, ensuring that the minimum of damage is caused to reveals, plaster, finishes and trims. It is recommended that structural mullions are removed one at a time, and that both the temporary supports and the pre-existing structure are closely monitored for any signs of settlement.'