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Is the first 12-15mm going to be plasterboard and plaster or is that sheet ply? If it's ply I'd be tempted to take the top 25mmish of it off and not cut into the beam, see how that sets them*, making good would be a good wood filler (right-hand top looks well off too but more like plaster there?!) . Standard disclaimer and I would be considered about their next problem if that was how they were left
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It’s all ply, nailed to beam/rafters. Feels/looks as though the windows were set to (just) clear the front edge of the beams, but then ply nailed to face, rather than flush has buggered that clearance. There really isn’t a huge amount in it (I say now.) I have access to the back side from inside the loft space, but not from the roof, but that’s the wrong side of the beam to do anything
I’d like to be able to open them to clean them, they seem otherwise good nick in that, they haven’t let water in all winter, no noticeable drafts etc that I’m happy enough to give it a go. I can open them and wiggle them a few mil within the clearance I have and they seem sound. Is there something I’m missing about velux that I shouldn’t be opening them?
My skylights in my house don’t open because they don’t clear the box they’re built into. The frames are built on the roof beam/trusses and then they are boxed through the loft space. I need to take a 10-20mm out of the top of the box/beam at the opening edge in order for them to have enough clearance to open. You can see in this picture where the frame is set back from where they are boxed in.
Would an oscillating multicutter be the best way to do this in a confined space? Taking ~10mm out of a roof beam isn’t going to make my house explode is it? (There is also the thickness of the boxing to clear.) This feels DIY-able but if someone tells me to leave it to a pro I’d be happy to…