I would nopt be so drastic. My old house was full of rot when I took it
down, but it was confined to areas that had existing damp problems.

Once you get the damp out, the rot dies. Just make good as you see fit,
but pay 110% attention to damp.

Isn't this confusing wet rot with dry rot. Dry rot brings its own moisture
in from its roots just like ivy, hence the name. Wet rot can only survive
in damp and will die when the moisture goes.

I found my dry rot specimen thriving in a thin void where cement render and
bricks had separated due to poor adhesion, and growing from next door
through a crack in the brick work. Conditions were desert dry but it had
almost reached my ceiling joists.. After cuprinol dry rot treatment it
hasn't reappeared since 1989 so I hope its gone.

rusty.