I am a prospective buyer of a time-share apartment in the mountains. I visited the site where the house is currently being constructed yesterday, in light drizzle. The foundation slab was cast, and a frame of planks was fixed as the structure for the outer walls. Under the planks, there was some sort of tar paper.

As mentioned, it rained yesterday, and there was water on the concrete slab, several millimeters high. It reached quite far up on the planks, and they had absorbed quite a bit.

It was five degrees yesterday, and it is unlikely to get much warmer moving forward.

The house is scheduled to be ready for occupancy by Christmas, which implies a fairly rapid construction pace.

How will there be enough time to dry out the planks? Isn't there a significant risk that harmful moisture will be built into the outer walls? Or am I unnecessarily worried? See pictures.

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That it is damp now is not a problem, if you make sure the moisture dries out before closing the wall again.
If the move is to be by Christmas, heat and possibly a dehumidifier are needed before the walls are insulated.
 
It looked the same for us as well. The moisture disappeared with the help of, among other things, a building fan. The problem was just that it had to run a lot since it had been so wet, so the construction electricity costs were really high. If it had been dry, you probably would have saved a lot of money.
 
No worries. There aren't many houses built without the timber getting wet; the slab already contains a lot of moisture. As previously mentioned, it's important to dehumidify before the walls are covered with plastic.
 
Do they really use plastic in cabins/timeshares in the mountains? In case of risk of being unheated, plastic is usually not recommended.
 
The type of sill insulation installed can be crucial if it absorbs and retains moisture. Judging by the picture, it looks like a rubber membrane, and the risk of having problems is significantly lower. Just make sure the sill is thoroughly dried before installing the plastic. (Yes, there should be plastic in the wall as no mountain cabins remain unheated today,)
 
Why is it so important to cover the timber at construction sites if it's still okay for it to get wet while building? This isn't skepticism towards those who say it's okay for it to get wet. I'm just wondering since I'm currently doing an extension myself and worry a lot about water on both the timber and the construction (even though I know the construction will have to dry out at least over the winter before it's time to wrap it).
 
When the timber "lies" down in a bundle, it must not get wet because it twists; if it is screwed/nail fastened, it cannot move in the same way... :)
 
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