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Diagnose the appearance of moisture

The construction of our house dates from 2013. For reasons of economy, we asked the manufacturer a delivery "out of water, out of air", everything else was managed by us For 2 years, we have not had no concern for humidity, but since last spring we have capillaries on 3 rooms including one north and adjoining a patio much more affected than others. Moisture occurs mainly when an object is in contact with the wall, when we remove it we find mold. This is an office (north, ground = seagrass) 3 bedrooms (south east, laminate floor) and a corridor (interior partitions) heated by an electric floor heating. I tell you it's a house with a single-sided roof and steel tray. what are the solutions? In my case, who should I contact: builder, the chapist? Are there moisture professionals, if so, what are they? Will this naturally subside?

The causes of humidity are many. Your description, although detailed, is not sufficient to establish a diagnosis, you must appeal to a company specializing in these problems, avoiding structures too related to the manufacturer of a system.
The disorders that you quote can have several causes:
1) insufficiently insulated wall, hence condensation phenomena causing the appearance of mold, especially at the floor, sources of thermal bridges (cold spots). This is a track to dig, especially as you indicate that the phenomenon is accentuated on the facades;
2) insufficient air exchange (you do not indicate if you with a VMC installed) accentuating the phenomena of condensation. Recent houses, if built in the state of the art, are very airtight. They therefore require a VMC installation adapted to the volumes to be treated;
3) insufficiently heated premises. Insufficiently heated premises, possibly combined with points 1 and 2, can lead to problems of condensation and mold;
4) capillary lifts. In view of the description and the photos, the track of the capillaries is not obvious. Especially as any new construction is normally equipped at the level of the foundations, a waterproof barrier (strip of arase) prohibiting the rise of moisture from the ground. If it were not the case, your builder would be at fault and he would have to turn against him. DTU20.1).

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