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[huspelle95]

Hey! I'm renovating a bedroom in an old log cabin from the 1880s. Since the subfloor faces a crawl space, it has been humid at times, so I'm planning to replace it as we're redoing the entire room anyway.

The crawl space, which is a partially finished basement (about 3 m in ceiling height), now has a dehumidifier and plastic on the ground.

The room is made of logs, as you can see in the photos.

I'm planning to place a horizontal beam under the floor joists, where I'll then lay down an oil-treated board (3mm). After that, I'll insert 220 particle boards, but now I'm a bit unsure. Should I install a vapor barrier, or just proceed with the floorboards directly afterwards?

 

[fribygg]

Are you only going to have a 3mm board as the bottom plate?

 

[huspelle95]

Thinking about placing battens under the floor joists that can support the board and then nailing it to the lying battens!

 

[fribygg]

Planning to place joists under the floor joists that can support the board and then nail it to the horizontal joists!

I think that the board will sag

 

[huspelle95]

I think the board will sag

Hm okay, what proposals do you have for a solution?

 

[fribygg]

Traditionally, one-inch boards were often used, it still works today.