I have a small dilemma that I hope you can help me with. I plan to lay cellblast above the gravel and then pour some concrete to make a floor. Now to the problem, as you can see in the pictures, the wooden beam is located far down and the floor will be about 10 cm up on the beam. I am afraid that this will become a bottleneck in the construction as I assume the beam will be more exposed to moisture and eventually rot. How can I solve this in a smooth way? Should I replace the beam with a steel one or place a metal plate between the floor and beam, or should I just ignore it and lay the floor anyway?
Are you going to pour concrete on both sides of the sill? If not, I would just protect the beam from direct contact with the concrete by placing either sill paper or XPS foam plastic, about 20 mm, in between. Any minor moisture that occurs dries out on the other side. However, if the beam becomes "enclosed" in concrete, I would consider removing it, pouring, and then rebuilding the interior wall structure again, if possible.
Yes, the idea was to cast on both sides; unfortunately, removing the stud is not possible. Otherwise, that's probably the best solution as you say. Does anyone have experience with rot if you encase the sill in foam?
Embedded studs are a common issue frequently discussed on byggahus.se. Cut away the "syll" but keep sections under the posts, pour the floor, place new posts on the new floor and remove the old posts and fill in the holes.
Walls can usually be temporarily removed while pouring, one post in the middle might be enough.
Do not embed lumber, either with or without plastic.
Removing the studs and casting a ledge is not technically difficult. What you need are a few supports and some planks to prop up the ceiling while you cut the studs and cast the ledge. You can rent supports from someone who rents out "construction tools" and the cost is not many kr.