How is my conservatory door fixed in place?

[Mr UPVC]

The frame of my conservatory door is not quite square at present, and the hinges don't offer enough adjustment to compensate. I would like to lower one corner of the door frame, but I can't figure out how it's held in place.

I lifted the doors off their hinges, removed the masonry fixings between the door frame and the dwarf walls, and removed the spacers between the door sill and the bricks underneath the door. There is some space between the door sill and the bricks, so it ought to be possible to lower the door frame, but even when I jumped up and down on the door frame, it didn't drop at all. There no other visible fixings in the door frame or the adjacent window frames that could be holding it in place, so what's supporting it? There are some vertical trim strips between the door and window frames, but I think I'd need to remove part of the roof to slide them out, so hopefully that won't be necessary.

Here are some pictures:

[Phil L]

frames that could be holding it in place"

Just because they aren't visible, doesn't mean they don't exist - it's likely that the window frames were screwed to the door frame on each side and also the window above, these fixings will be behind the glass units of the windows, you may need to remove the units to get these fixings out prior to any adjustment of the door frames.

[Phil L]

Thought so, otherwise you'd have to leap over it each time you went through the door :-p