Floor joists supporting roof load?

[Dennisthedog]

In a loft conversion where new larger floor joists span from eaves to centre spine wall to eaves, is it possible to substitute roof purlins (& supports) with a structural stud wall which is built off these new floor joists rather than off a steel beam, if the floor joists are of a larger S.E. calculated size (than those stated in span tables which obviously only consider floor loadings)?

Im just considering an easier installation method (possibly) than inserting a large/long/heavy steel (with awkward access), before calling back the S.E. to recalc.

Thanks in advance

 

[Deluks]

Yes, may not be cheaper though. Although if timber is your medium then could be an option.

 

[mac391]

As far as i know (since having this done myself) Your new larger floor joists will have to installed on or into new steel (RSJ's) in order to remove the purlns & supports. Sounds like a "yes" from what i read. You could check with a surveyor/architect tho..to be sure

In a loft conversion where new larger floor joists span from eaves to centre spine wall to eaves, is it possible to substitute roof purlins (& supports) with a structural stud wall which is built off these new floor joists rather than off a steel beam, if the floor joists are of a larger S.E. calculated size (than those stated in span tables which obviously only consider floor loadings)?

Im just considering an easier installation method (possibly) than inserting a large/long/heavy steel (with awkward access), before calling back the S.E. to recalc.

Thanks in advance