orbital

Thank you all for your advice, it's very much appreciated. 👍

The joist centres are 400mm, if I cut one out for the square, how many adjoining joists should I brace the cut too?

Hi there's no wall below that point, I thought they would just fix the plasterboard to the roof truss instead of installing an extra set. I'm guessing it's a structural thing.

Hi thanks for your replies, there is a kitchen underneath, the roof was done before we moved in, the ceiling is quite low compared to the rest of the house so we're trying to open it up. No insulation installed which explains a couple of things (cold and damp). I might go down route of installing the roof windows and putting (roof chutes?) like in the picture.

Hi I'm looking to take down my kitchen ceiling and open it up to the rafters on the pitched roof that has double Roman tiles, I want to put in roof windows, it's around 4x2.5, I'm a bit confused because it has double joists, one set seems to be part of the roof truss and the other has the plasterboard fixed to it, it seems overkill to me or am i missing something?