andrew wrote:
My daughter wishes to fix a track around the bay window. The pvc
double glazing is full height of the bay and the bay ceiling feels
like plasterboard and unlikely to stand the weight.

What is the recommended way to attach a curtain rail?

The bit between the top of the window & the ceiling is prolly a cover strip.
Drill a small trial hole & see how deep the uPVC is.

If it is a cover strip drill through & into the masonry.


--
Dave - The Medway Handyman
www.medwayhandyman.co.uk