Googled and searched, but can't find any good pictures or descriptions of how people have done it. So I'm turning to the best hope.

Log cabin, 1800s, rotten sill in some places and suspected rotten floor joists where they join the said sill.
How to restore this structurally?

I understand there is a "building conservation way" and a "make it work way". I have no experience in fitting timber to timber, so I'm leaning towards the latter.

My thought is to cut off where it is completely healthy. On each side of the existing floor joists, nail on battens that attach to the sill or rest on the foundation wall, depending on how it was built initially.

Right idea, or other suggestions?
Is it more solid in some way to "fill" the cavity in my picture with new material? Again, I understand that finding a log piece with similar dimensions and joining them with various jointing principles would probably be best. But it's complicated for me who has never tried.
 
  • Diagram illustrating a log wall with three horizontal beams, highlighting a damaged beam with a potential repair approach using new material in yellow.
Cut away the rotten part, place a post under it on the ground with a concrete slab 300X300 mm that can anchor the post/slab so it doesn't move. Mill the log (probably round) a bit to create a flat surface on both sides, attach for instance a 125X45 beam on both sides at least 1000 mm from the end with at least 3 through bolts (fully threaded rod) and large washers, preferably with lock nuts as well. Then it's up to you to see how you attach it to the beam or foundation.
 
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J jonaserik said:
Saw off the rotten part, place a post under to the ground with a concrete slab 300X300 mm which can be anchored to the post/slab so it doesn't move. Mill the log (probably round) a bit so there's a flat surface on both sides, attach for example a 125X45 beam on both sides at least 1000 mm from the end with through-bolts at least 3 of them (fully threaded rod) and large washers, preferably with locknuts as well. Then how you place it against the support beam or foundation you'll have to see for yourself
Thanks, feels very doable.
 
Get hold of a small piece of house timber and splice it into the fresh part with a lightning joint so you don't need to build with a pillar underneath. Otherwise, there's surely a carpenter nearby who can fix that in a day.
 
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