I filled the gap around my uPVC door frame with expanding foam to seal it fast: the next morning, when the door wouldn’t latch anymore, I understood what the foam had been doing all night
You sealed the gap around your uPVC door with expanding foam before bed, but by morning the door wouldn’t latch. Standard high-expansion foam doesn’t stop pushing outward as it cures—it can generate enough force to bend plastic frames by just a millimetre or two, throwing your latch completely out of alignment.