What is the best solution?

[Bertil1957]

I am going to redo the floor in this extension due to a bad smell coming from the floor. I suspect damp insulation in the crawl space. I am also considering enclosing the foundation and will drain around it. I am open to suggestions for solutions!🙏

 

[fribygg]

If you have moisture in the trossbotten, you likely have a leak through the roof; it seems to be exemplary airy underneath, so the moisture is unlikely to come from there.

 

[Bertil1957]

If you have moisture in the subfloor, you probably have a leak through the roof. It looks to be excellently airy underneath, so no moisture is likely coming from there.

Yes, maybe so. The exterior panel is attached to asfaboard without an air gap, so I suspect that might also be the culprit. I am in the process of replacing the panel and also replacing the insulation.