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Loft trussed roof ideas

katar83 said:
(...)
This obviously aint a typical "conversion" and I'm aware that normally everyone that looks at these trusses immediately thinks the whole house will collapse the moment you swing a hammer and nail at them
(...)
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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 absolutely need to double and triple them because it will blow off any minute. The Velux is absolutely fine.

It's discouraging that people don't read full thing before making their conclusions but just to reiterate, I won't be cutting any webs and didn't plan to, without providing a separate support for them first, signed by SE and only if I can find one.
 
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freddiemercurystwin said:
Well not wanting to play devils advocate here (I've already said it may prove problematic when he comes to sell) but if an SE proves it works (or some version of the OP's utopia) and the modifications are carried out as necessary then the roof won't blow off or fail.

It's pointless speaking to the truss manufacturer, especially for some ancient roof, they won't be the slightest bit interested furthermore they're not structural engineers and will always outsource to a separate structural engineer for anything out of the ordinary anyway.
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I wouldn't say its an ancient roof as its using CE tags so you can identify where the trusses are from and contact details. Furthermore, the truss manufacturer will be able to use the services of the engineering software providers, to prove what is/isnt possible. (the ones who provide the software, plates, engineering calcs for the trusses). It not outsourcing as such.

I would always suggest contacting the truss manufacturer before carrying out any additional works.
 
Not wanting to take a topic here so I apologise, but I can confirm the software we use has the capabilities to remove what ever we wish. For remedial work, i.e something like the above we would push this onto whoever we are buying the plates from (who also supply the software) Mitek, Wolf or ITW. So again I would go to the suppliers/manufacturers of the truss 1st. Quite probably cheaper for them to come up with a detail then a SE.
 
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" companies, just asking if they could help with some calculations and only one replied saying they are busy and will get back to me in 2 weeks.
Bonkers.
 
chickenlips said:
I wouldn't say its an ancient roof as its using CE tags so you can identify where the trusses are from and contact details. Furthermore, the truss manufacturer will be able to use the services of the engineering software providers, to prove what is/isnt possible. (the ones who provide the software, plates, engineering calcs for the trusses). It not outsourcing as such.

I would always suggest contacting the truss manufacturer before carrying out any additional works.
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As said, truss manu's do not want anyone messing with their roofs - full stop. If you think they'll be cooperative and even bring on a SE to alter their design, you are living in cloud cuckoo land. It's the last thing they'll want to get involved in.
 
First of all, forget emailing, you won't get anywhere, nobody ever responds to emails that's merely a red rag telling them you're already sending an email to everyone else. See if you can find an individual SE one man band type of outfit rather than a big company. This is a Friday afternoon make a few quid job, expect to pay £500+ assuming you provide them with everything they need.
 
freddiemercurystwin said:
Well not wanting to play devils advocate here (I've already said it may prove problematic when he comes to sell) but if an SE proves it works (or some version of the OP's utopia) and the modifications are carried out as necessary then the roof won't blow off or fail.

It's pointless speaking to the truss manufacturer, especially for some ancient roof, they won't be the slightest bit interested furthermore they're not structural engineers and will always outsource to a separate structural engineer for anything out of the ordinary anyway.
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I suspect that even with an SE design, many surveyors, working in CYA mode, will flag it as not normal and suggest a structural survey.
 
stevie888 said:
I suspect that even with an SE design, many surveyors, working in CYA mode, will flag it as not normal and suggest a structural survey.
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Btw, I'm aware life can change quickly but not planning to ever leave this house so there is that, shouldn't be a problem for me :)
 
noseall said:
Oh. Is that why the rafters are not doubled up each side, or are they just not visible?
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Correct, not visible in the pic. Fyi, additional rafter is slightly recessed and thicker to eventually allow sheet of ply between rafter for additional bracing and overall strength on each side, ain't there right now because I'm sorting out pir insulation, plus original bracing is still there. Base web was also strengthened and additional trimmers were added before velux was put in. Top part of the roof with the velux in is technically much much lighter now than the tiles I've removed too.
Hope that answers all velux questions anyone here might still have, somehow it wasn't anything I wanted to ask about and still half the posts in this thread are about the window. I had three roofers here and all agreed it's all good.
 
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katar83 said:
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" companies, just asking if they could help with some calculations and only one replied saying they are busy and will get back to me in 2 weeks.
Bonkers.
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You would be better going to the manufacturer who designed the roof in the 1st place. All the details should be on the CE tag.
Mitek is the company who supplies the software and plates and the engineering. The manufacturer will be able to pass the design onto mitek for a remedial. You could be looking at 250 for the detail.
I've not used mitek software for a while but that what the company I worked use to charge out.
 

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