On 27/09/2020 09:01, RJH wrote:
On 26 Sep 2020 at 19:44:01 BST, "Peter" wrote:

On Saturday, 26 September 2020 at 19:10:59 UTC+1, John Rumm wrote:
On 26/09/2020 18:11, Peter wrote:
Bay window has rot in the bottom of the 6 boards which form the
boxes. Going to cut away and piece in new timber lower 6-12" or so
each one. Could cut 90deg and put a couple of dowels in, or scarf to
increase the connecting end grain area. Or something else?
I quite like doing a scarf joint since you can then use screws into the
face to bring the joint together. You can use a two part resin filler in
the joint as well to form the glue and exclude any voids in the process,
and fill the screw head holes (if countersunk a little).


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/
Thanks for the advice John. Scarf- at about 45deg? The boards are about 225
wide

Is this joining at a piece of the original timber? If so, what's the best way
to cut away the joint face?

Multi-tool, carefully hand held. Maybe temporarily screw the new timber
onto the old with an overlap and make the 45 degree cut through both new
and old so the cuts match up. Naturally you must allow for the extra
x mm that will form the scarf joint.