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Mitek is the designer, I would imagine them being a big company, they either wouldn't be interested or charge an arm and a leg to do any calculations? Does anyone have any ideas how much something like this might even cost? I guess I can email them and ask. So far I emailed three "local"...

I think the funniest one I've read here was a guy, that removed one of his rafters for a very small velux, think sometime in 2014 and despite the roof being very clearly overengineered to a point of being ridiculous with the adjoining rafter/beams being the size of my leg, he was told they...

Thanks, that at least gives me something to go with to an engineer, finding one is another matter, they are rarer than hens teeth here it seems so might have to look further away. The short webs where they join the bottom of the whole truss do sit on a supporting bedrooms/bathroom walls, they...

There's a diagonal bracing just where the lower left corner of the velux is and there's a horizontal one tying the outer webs. They are there and this wasn't what I asked about. The same ones are on the other side of the roof and there's one at the top of the roof that is nailed to all trusses...

I didn't. Bracing is there, adjoining trusses were strengthened. No need to worry about Velux. I'm well aware, that with e.g. snow there would be significantly more load in there and they would most likely stiffen up. Telebeams from what I understand are mainly there for proper conversions...

Might need bit more than that. Do not go to structural engineer?

Before I go to a structural engineer, I thought I'd ask some questions here. I just finished boarding up the loft which of course took ages to do(30+ hours). Earlier this year I've installed the velux window which helped massively with this job. Of course this is a crappy trussed roof and the...