On 25 Nov, 11:23, " wrote:
For joints mid run, intend using 45 degreescarfjoints (lined up over
rafter end) .... should these be glued or left dry ?

Alternatively you could join them at ground level (assuming you and a
mate can lift a full-length run into place).

Then you could aim for the joints to fall between rafters, and butt
join them, along with an additional timber plate on the back - glued
and screwed into place.

This approach would have the advantage of getting thefasciaperfectly
straight (assuming the building is straight enough to accomodate it!)

Regardless of what approach you use - polyurethane glue is good for
closing up and sealing watertight joints.

I would think most installers are much less fussy - at best you'd get
some paint on the end grain of a buttjointon a rafter end.

I agree ... on installers, I will even be coating rear of fascias with
stain, as it help uneven moisture absorption.

Had a tip to make scarf joint more longer i.e. much more acute than 45
degree ...

Jointing up lengths and reinforcing with back timber seems a good
idea, I could add some biscuits as well.

Just routed a 10mm slot along all the lengths to take soffits .... so
pre-jointing seems like another 'prep job' that may be worth doing.