In the morning my dad send me a picture. He had continued breaking open the floor and found out that while the first part had some crumbly underfloor with saw dust insulation, the rest of the floor did not have an underfloor, so no wonder the floor was cold in this part of the house. This also means we have to put in an underfloor and insulate this part.
When I got to the house the technician from Eesti Vesi came to change the water meter and open the main valve again. Of course he double checked if the water meter was broken, which was pretty obvious. So pretty soon after we had a new not leaking water meter.
The rest of the day we continued breaking open the floor
The new water meter is placed 
No wonder this part was cold 
Some ‘treasures’ found under the floor
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