Roofing timber charts, sizes and uses?
Discussion
Long story, cut short:
My architect is a t
t.
Need to redesign roof.
Need to find relevant span info on various timbers in different uses (i.e. rafters, hips and joists), and "typical" sizes used in the various aspects.
Heard tale of a "bible" that covers all these things, what's it really called, where can I find it!
My architect is a t
t.Need to redesign roof.
Need to find relevant span info on various timbers in different uses (i.e. rafters, hips and joists), and "typical" sizes used in the various aspects.
Heard tale of a "bible" that covers all these things, what's it really called, where can I find it!
Davi said:
Long story, cut short:
My architect is a tt.
Need to redesign roof.
Need to find relevant span info on various timbers in different uses (i.e. rafters, hips and joists), and "typical" sizes used in the various aspects.
Heard tale of a "bible" that covers all these things, what's it really called, where can I find it!
http://www.amazon.co.uk/Roof-Framers-Bible-Mussell-Barry/dp/0964335433/ref=pd_sim_b_4My architect is a t
t.Need to redesign roof.
Need to find relevant span info on various timbers in different uses (i.e. rafters, hips and joists), and "typical" sizes used in the various aspects.
Heard tale of a "bible" that covers all these things, what's it really called, where can I find it!
HTH
Cheers stig, I'll see if I can find what's in that, but I think it's a bit of a literal result - from what I've been told the BCO's call the thing I'm looking for their "bible" but it is in fact a manufacturers reference book of charts and stress calculations / loadings, rather than a "how to" book.
GreenV8S said:
You plan to redesign the roof yourself? From the post I assume you aren't qualified or competent to do that so obviously you wouldn't be building from your own design. In that case, why are you trying to do the calcs yourself?
Yes I plan to redesign the roof myself and yes I'll be building from my own design, I'm most certainly not qualified but I'm also most certainly more competent than the architect - I've already had to redesign massive portions and had it all passed by BCO, just another learning curve to get over!Edited by Davi on Thursday 4th September 16:07
wizzbilly said:
send the sizes over and will work it out for you , or if you prefer i will try dig the sizes out from all paperwork i got here ,
wizzbilly, cant email you from profile, it's quite a complicated setup (4 hips, 3 valleys, ridge and 4 hip extensions on old section and now thanks to architect a mismatched ridge height on a return)Davi said:
wizzbilly said:
send the sizes over and will work it out for you , or if you prefer i will try dig the sizes out from all paperwork i got here ,
wizzbilly, cant email you from profile, it's quite a complicated setup (4 hips, 3 valleys, ridge and 4 hip extensions on old section and now thanks to architect a mismatched ridge height on a return)Edited by wizzbilly on Thursday 4th September 16:53
Davi said:
wizzbilly said:
send the sizes over and will work it out for you , or if you prefer i will try dig the sizes out from all paperwork i got here ,
wizzbilly, cant email you from profile, it's quite a complicated setup (4 hips, 3 valleys, ridge and 4 hip extensions on old section and now thanks to architect a mismatched ridge height on a return)Best advice would be to take the architect in hand and follow a legal route to get him killed off.
Try this
http://www.diydoctor.org.uk/projects/load-bearing_...
ETA, might be similar to the one just finished on my house, no ridge only hips.
http://www.diydoctor.org.uk/projects/load-bearing_...
ETA, might be similar to the one just finished on my house, no ridge only hips.
Edited by gtr-gaz on Thursday 4th September 17:17
Given how important the roof is, don't you need to have the design at least approved by somebody qualified, and with adequate liability insurance in place in case it goes wrong? I could probably knock up a roof with a couple of sheets of galvanised and some planks, but neither my mortgage company nor household insurers are likely to be happy about it - nor would any prospective purchaser.
Davi said:
GreenV8S said:
You plan to redesign the roof yourself? From the post I assume you aren't qualified or competent to do that so obviously you wouldn't be building from your own design. In that case, why are you trying to do the calcs yourself?
Yes I plan to redesign the roof myself and yes I'll be building from my own design, I'm most certainly not qualified but I'm also most certainly more competent than the architect - I've already had to redesign massive portions and had it all passed by BCO, just another learning curve to get over!Edited by Davi on Thursday 4th September 16:07
Apologies if the following is stating the bleedin' obvious:
1) The design will need to pass muster with Building Regulations.
2) If it's simple enough to design using the tables in Approved Document A to the Building Regulations(free download available here), then the Approved Document is all you need.
3)If the roof is too complex to design using the tables in Approved Document A, then you'll need to provide structural calcs to prove the design anyway, in which case the 'ready reckoner' type bibles won't help you... they'll expect to see specific structural calculations presented in the 'standard format' they are used to (ie. in accordance with the relevant British Standards). In which case, find yourself a Structural Engineer; they won't charge that much.
4) If you really want to have a bash at doing the structural calcs yourself, e-mail me via my profile if you need any of the British Standards listed in Section 1 of Approved Document A; I can probably get hold of PDF copies of them.
5) As others have said, the alternative is to do it in trussed rafters (with attic trusses if necessary); you can usually do pretty much anything you want with trussed rafters, these days, and the manufacturers will generate the necessary structural calcs to support the design free of charge.
1) The design will need to pass muster with Building Regulations.
2) If it's simple enough to design using the tables in Approved Document A to the Building Regulations(free download available here), then the Approved Document is all you need.
3)If the roof is too complex to design using the tables in Approved Document A, then you'll need to provide structural calcs to prove the design anyway, in which case the 'ready reckoner' type bibles won't help you... they'll expect to see specific structural calculations presented in the 'standard format' they are used to (ie. in accordance with the relevant British Standards). In which case, find yourself a Structural Engineer; they won't charge that much.
4) If you really want to have a bash at doing the structural calcs yourself, e-mail me via my profile if you need any of the British Standards listed in Section 1 of Approved Document A; I can probably get hold of PDF copies of them.
5) As others have said, the alternative is to do it in trussed rafters (with attic trusses if necessary); you can usually do pretty much anything you want with trussed rafters, these days, and the manufacturers will generate the necessary structural calcs to support the design free of charge.
Edited by Sam_68 on Thursday 4th September 18:10
Sam_68 said:
Apologies if the following is stating the bleedin' obvious:
1) The design will need to pass muster with Building Regulations.
2) If it's simple enough to design using the tables in Approved Document A to the Building Regulations(free download available here), the the Approved Document is all you need.
3)If the roof is too complex to design using the tables in Approved Document A, then you'll need to provide structural calcs to prove the design anyway, in which case the 'ready reckoner' type bibles won't help you... they'll expect to see specific structural calculations presented in the 'standard format' they are used to (ie. in accordance with the relevant British Standards. In which case, find yourself a Structural Engineer; they won't charge that much.
4) If you really want to have a bash at doing the structural calcs yourself, e-mail me via my profile if you need any of the British Standards listed in Section 1 of Approved Document A; I can probably get hold of PDF copies of them.
5) As others have said, the alternative is to do it in trussed rafters (with attic trusses if necessary); you can usually do pretty much anything you want with trussed rafters, these days, and the manufacturers will generate the necessary structural calcs to support the design free of charge.
you will need to down load the 1992 version of part for the span tables, they removed them from the lastest version.1) The design will need to pass muster with Building Regulations.
2) If it's simple enough to design using the tables in Approved Document A to the Building Regulations(free download available here), the the Approved Document is all you need.
3)If the roof is too complex to design using the tables in Approved Document A, then you'll need to provide structural calcs to prove the design anyway, in which case the 'ready reckoner' type bibles won't help you... they'll expect to see specific structural calculations presented in the 'standard format' they are used to (ie. in accordance with the relevant British Standards. In which case, find yourself a Structural Engineer; they won't charge that much.
4) If you really want to have a bash at doing the structural calcs yourself, e-mail me via my profile if you need any of the British Standards listed in Section 1 of Approved Document A; I can probably get hold of PDF copies of them.
5) As others have said, the alternative is to do it in trussed rafters (with attic trusses if necessary); you can usually do pretty much anything you want with trussed rafters, these days, and the manufacturers will generate the necessary structural calcs to support the design free of charge.
Edited by Sam_68 on Thursday 4th September 18:00
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