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(Caveat - this is all guesswork)
The beam / rsj / joist combo looks like it would be difficult to use PIR & plasterboard, and still have sufficient ventilation.
It looks like you could insulate the knee wall with PIR too (with sufficient ventilation to enable unimpeded airflow from eaves overhang to eaves overhang).
Insulated plasterboard might work over the rafters, or plasterboard over insulation blanket.
Plasterboard should be self supporting upside-down if you have it attached off the correct centres (the product spec sheets should have the details)
If that's a Velux, they do like to magnify the heat - After-market (external) awning blinds have some positive impact.
Foam pipe lagging on the big beams?
NotThamesWater
Soul
Plasterboard - any tips?
Going to start making the attic a bit prettier if I'm going to be working in it a lot.
Currently there are roof tiles / covered in some kind of plastic sheeting and then the diagonal rafters on either side of our sloped roof. Velux on one side.
The previous, previous owner put a couple of plasterboard sections on some parts of the rafters. I'd like to finish the job then paint matte black. I'd also like some steel pipe running lengthways along the ridge - it's a terrace, so from next door to next door so I can use it as a truss for lights / frames etc.
Is there anything I should be aware of with the plasterboard - supported weights to hang at that angle etc? Also is there anything I will regret not being able to access? Should I insulate etc etc?
It's VERY hot up there at the moment.
I'm going to cover the windows with cinefoil (black tin foil) to control light. Maybe on a magnetic frame or something so I can have daylight when I want it but blackout when I'm shooting.
Anything I can do about the exposed struts? I kind of like them for rigging stuff, too but any common ways of making them less lethal for a 6'5"er?