span tables

[Gunslinger]

anyone know where i can get a copy of

span tables for solid timber members in floors ceilings and roofs for dwellings

i am sure it's in the Span Tables 2nd Edition

[code:1]http://www.trada.co.uk/bookshop/view/2CA5EBC2-FE14-450A-A7B7-EB45FBA6D607/Span_Tables_2nd_Edition[/code:1]

but i dont want to have to fork out £25 for one bit of info regarding unsuported spans in relation to rafter dimensions that i need

 

[freddiemercurystwin]

http://www.planningportal.gov.uk/uploads/br/BR_PDF_AD_A_1992.pdf

 

[Gunslinger]

thank you, i will have a read through that

just a quick question, that says 1991 edition, is the info still the same/pertinent ?


i basically have a 16 degree pitch planned on one half of the house, to replace the original rear roof, this requires 3 purlins and one of them is basically in a place i dont want it for a number of reasons, but according to the structural engineer can't be moved as the span would be too great and the cantilever effect too high..... subsequent closer inspection of the plans has revealed that he is calculating based on 4x2 rafters, which despite being told if using larger rafters would allow more flexibility in relation to positioning, then do so, it seems he hasnt.

so yet again with "specialists" i find myself doing something i have already paid someone else to do

thanks for the help there with the pdf file, and if anyone else can chip in please do so

 

[freddiemercurystwin]

just a quick question, that says 1991 edition, is the info still the same/pertinent ?

It is but you need to know how to interpret it which is largely why it was removed from the later edition as too many people were sizing stuff up without really knowing what they're doing!

It seems you should be getting the answers to your second question from your engineer however if no one else pipes up with an answer I'd post your question in the Building forum and title it 'FAO Shytalkz'.

 

[Gunslinger]

ok, will do.

its too hot and late here to concentrate properly on it right now, but from what i read so far, i can see why people get it wrong if they dont sit down and read it properly like you said

I have a couple of avenues left to me yet, but it is looking more and more likely that the combination of using a lightweight Decra roofing system, combined with larger rafters will yield the desired results, and allow me more flexibility with the positioning of the third purlin, once i know it works, i will pay someone different to do the calculations before i submit for building regs (building inspector has already seen the plans, and saw the problem almost immediately, while he was out looking at stuff for the loft room!).... but it still leaves me with a bitter taste in my mouth, knowing that while the current engineer has done sufficient calculations and material specifications to get teh roof change through bulding regs, he has created a huge problem with the loft extension that he is not interested in correcting.