I am planning to install a cast iron stove and radiation-proof the walls for it in our Norrbotten farmhouse (a long, narrow log house over 100 years old). The stove will be placed in an inner corner, at the angle between a load-bearing log wall and a regular wooden stud wall. The floor structure consists of round beams spaced about 1000-1200 mm apart in varying dimensions.

So, I'm faced with the question of how much the walls and flooring can bear without problems. The stove itself will probably weigh 120-150 kg. There are various solutions for the radiation protection needed:

- EI90 wall with 75 mm lightweight concrete blocks, e.g., multiplattan, weighs about 300 kg, around 2000 SEK => EI90, i.e., 50 mm distance to the stove

- EI90 wall with 90 mm Lecablocks weighs just under 400 kg, around 800 SEK => EI90, i.e., 50 mm distance to the stove

- Ventilated Minerit gap, about 80 kg, around 1700 SEK => radiation protection 250 mm distance to the stove.

So, those of you who have experience, what do you think about how much load these old beam floor structures can handle? The timber is in good condition and from diameter 200 and upwards. The load from the wall covering will partially distribute onto the wall, but at the same time, the wall stands on the flooring in one case.

What load can I handle, and which option should I choose? Do I need to mention that I would like to have the stove in the corner, i.e., a short distance to the wall is preferable?
 
Anyone have a clue? :( I heard a figure that the boundary between so-called "heavy fireplace" and light fireplace was at 300 kg, which would mean that normally one rarely loads more than that with "point load" on a regular wooden beam floor.

Anyone who can give me a rough idea of load-bearing capacity? I am fully aware that it probably can't apply specifically to my situation, but there are more timber houses in the country. How have you done it yourselves?
 
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