I am redoing the entire floor joists in the old log part of the house. There was rot in the ground beams, sill, and joists as well as a completely enclosed crawl space. I have also opened up the wall towards the rest of the foundation. I will cover the ground with plastic as I have in the rest of the foundation and use a sorption dehumidifier. The problem arises at the chimney. There, I will go up with the plastic and place it on the cast part. The joists around the chimney will have a 22*95 board to lay the fiber cement subfloor on. So there will just be a small piece of board between the chimney and the joist. Then insulation. This will mean that a small part of the insulation will be covered with plastic from the wrong side, the cold side. Is there a big risk that there will be condensation in the insulation? I won't have plastic on the warm side, so it will be able to breathe upwards through the floor, it should be noted.
On the cast part at the chimney, there is about a one cm difference in height compared to the joists. The joists are slightly higher than the casting. So there I was thinking of putting insulation between the floorboard and the concrete. Also, some piece of board to support the floorboard in towards the chimney.
Do you see any problems with this? Should I cover all the way up to the chimney instead of stopping halfway on the cast part?
On the cast part at the chimney, there is about a one cm difference in height compared to the joists. The joists are slightly higher than the casting. So there I was thinking of putting insulation between the floorboard and the concrete. Also, some piece of board to support the floorboard in towards the chimney.
Do you see any problems with this? Should I cover all the way up to the chimney instead of stopping halfway on the cast part?
