wrote:

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


Is it not on then to remove the additional matchstick forest from just
one truss, and add glued screwed additional depth to all 3 sides to
bring it upto required strength, and once done move onto the next one?

That might also work. Not having done a trussed roof I am not famillier
with the range of methods used to deal with them. Building a new roof
supporting structure in parallel to the old would seem like a safe
option, but may well be more work than is actually required if you can
reuse some of the existing stuff. It will also depend a bit on what sort
of converison you are doing since in many cases you won't be keeping the
triangle shape of the trusses due to dormers etc.

--
Cheers,

John.

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