wrote:

http://www.internode.co.uk/loft/index.htm Would be a good start.
The owner is a regular poster here.


I don't believe that was a modern truss roof.

Nope it wasn't... having said that, some of the same approach may be
possible. A trussed roof would probably have less cross members and tie
beams to get in the way, and this may allow the introduction of the
floor joists between existing trusses without actually changing any of
them at that stage.

It would obviously be fiddly work however since you would be working
among all the extra wood of the trusses. A 4.5m span is within the
realms of possibility for a wood beam (or a flitch beam certainly). You
would probably need more holes through the roof however to get them in
there since any rotation or moving them about once in the loft is going
to be pretty difficult!

The harder bit is making sure you have adequate support in place before
you start trimming out the webbing of the trusses.


--
Cheers,

John.

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