Moisture in the bedroom on the exterior wall - Where does it come from?

hello everyone,

on the holiday I noticed in our bedroom that an exterior wall (double brick masonry) looks slightly damp at the bottom. Here are a few facts:

-basement slightly damp
-basement is only 1.30m in the ground, so the living space starts about 1.00m above ground level.
-I have a moisture meter, but the probes of the device only penetrate 0.5cm into the wall. Here I measure values between 5-7% moisture at the described spots.
The bedroom is equipped with laminate flooring, which lies on a wooden structure.
The heating is actually always off in the bedroom.

Here are my questions:
-can the moisture come from the basement?
-should I remove the laminate and check the condition of the wall underneath?
-is the wall actually “damp”? (cf. measurement data)

I realize that I will not get an expert report here and that a remote diagnosis is difficult. Nevertheless, I look forward to your expertise and opinions.

Best regards

The basement is only 1.30m in the ground, so the living space starts about 1.00m above the ground.

Could the moisture be coming from the basement?

The bedroom is equipped with laminate flooring,

I can’t follow the explanation at all: sometimes you talk about the basement, sometimes about the bedroom. Is it a part of the basement that is used as a bedroom?

The heating is actually always off in the bedroom.

Why? How is the room supposed to dry? Or is it not a new building?

So the bedroom is located on the ground floor. My explanation was meant to assess the situation. It is not a new building. The heating is off because we like to sleep "cold".

I hope I was able to provide clarity.

The heating is off because we like to sleep "cold".

The question from ypg about how it can ever dry like this is justified. I would at least heat the room during the day to above the dew point level.

So if I only had the choice between a heated bedroom or a moldy bedroom, I would know what I would choose. I also don’t like turning on the air conditioning in the car in autumn to have open windows, but an accident is definitely more expensive...

I am trying to find the cause. It is not a new building!! Or do you think that the lack of heating is already the reason why the wall looks damp? If so, that cannot be inferred from your posts. What about the measured values?