:x In need of some advice... I have a house with a basement built in 1945. There are 7 interior doors in the basement made of wood directly on the concrete. Now Anticimex wants me to remove the thresholds and about 20 cm up on each side of the frame so that the insurance against house fungus will apply... It won't be approved if I install new doors and have moisture barrier underneath... how the hell am I supposed to do this? The guy from Anticimex wasn't allowed to give advice, he said... It feels a bit like a Catch-22; they complain but can't tell me how it's supposed to be... grrrr I asked about some other things too, but he didn't want to answer anything. He also complained that the window in the bathroom was rotten because the paint was peeling... he didn't measure moisture in the window but said that's how it is if the paint peels... I measured the window myself = bone dry and healthy wood, so I have now fixed that. Feels like he had 0 clue...
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Do you have moisture problems in the basement? Or did they mean that in general, you must have doors that end 2 decimeters from the floor in all basements?
Unfortunately, the level of knowledge among Anticimex inspectors is quite varying. Suggesting that there should be a 20 cm gap under the basement doors is just ridiculous. Syllpapp under the frame is sufficient, as long as you don't have a flood. My basement doors have been against concrete for 80 years and I haven't seen any dry rot yet.
There is some moisture measurement on certain exterior walls, but the wood in the doors and frames is quite dry. Slightly elevated at one spot in the threshold between the garage and the rest of the basement, but not more than about 5% according to the meter. It was because moisture can come into the door frame from the concrete... Frames and doors are from when the house was built.