ᐅ Move-in at 85% relative humidity

Yes, it is possible to significantly reduce the humidity levels—depending on how wet the walls and floors still are. Is the house already ready for occupancy?
High humidity is not harmful to children initially. It only becomes dangerous when mold starts to develop. With the cold air at the moment, it is still worthwhile to ventilate frequently. Cold, dry air can absorb a lot of moisture.

Hello,

ILWJ schrieb:

Our move-in date is 26.04.2014.
Currently, there are four Trotek TTK600 dehumidifiers running in the house.
Last night I turned them off once, and this morning I checked the humidity: 85%.

Is it safe to move in with small children under these conditions?
Can we expect a significant improvement after another week of drying?

The screed has been in place for almost 4 weeks – what about the standard drying procedure for the screed?

Standard-Compliant Screed Drying

Surface heating systems are today one of the most favored heat emission methods for building types ranging from single-family houses to large commercial properties. One key reason for this trend is that surface heating supports efficient operation of heat sources working at low system temperatures. An additional advantage is the possibility of using underfloor heating simultaneously as a cooling system. In new construction and the renovation of larger projects, surface heating systems are mainly installed as wet systems embedded in screed. Proper drying of the screed structure requires norm-compliant heating according to the specifications of DIN EN 1264-4. The heating and cooling process takes place in several stages with different flow temperatures at each stage. The heat supply must provide stable flow temperatures.

Automatic Program for Screed Heating

A mobile control unit is available to automate the screed heating process. Over a defined period, this control unit enables norm-compliant screed heating according to DIN EN 1264 with preset target temperatures. During operation, the actual status is monitored; if deviations from the temperature curve occur, the device issues an error message. For documentation, the control unit stores a measurement log that can be read via a USB interface. The user can select fixed heating programs or create a custom temperature curve. If there is a short power outage (max. five minutes), the device saves the progress and resumes heating from the interruption point once power is restored. This function avoids the need for re-entering data.

The control unit, which can be rented additionally with mobile electric heaters and heating centers, allows the specialist contractor to perform both functional heating and readiness heating automatically and in accordance with standards. There are essential differences between functional heating and readiness heating:

Functional Heating:

Cement and calcium sulfate screeds must be heated before applying the final floor covering. Although functional heating removes part of the excess moisture from the screed, it does not mean the heating process required to reach readiness for the subsequent floor covering installation. According to DIN EN 1264-4, functional heating serves solely to document defect-free heating installation by the heating specialist. Functional heating starts after the screed’s specific resting time. This is 21 days for cement screed and seven days for calcium sulfate screed. However, functional heating alone does not guarantee the necessary residual moisture level for floor covering installation, as outlined in the interface coordination of BVF.

Readiness Heating:

Achieving readiness for floor covering is a prerequisite for starting flooring work (e.g., tile or parquet installation). Readiness heating involves a different heating procedure than functional heating. To ensure smooth construction progress, it is recommended that readiness heating follow functional heating immediately. For cement screeds, readiness heating starts after at least 28 days, and for calcium sulfate screeds after 14 days. For screed thicknesses up to 70 mm (3 inches), readiness heating typically lasts a minimum of 14 days. The heating contractor must note that readiness heating according to VOB/C (DIN 18380) is considered a special service. Therefore, this service must be separately commissioned and compensated by the client. The contractor should determine and document the transition point from functional to readiness heating in the test protocol (Protocol P7 in interface coordination). During readiness heating, the heating should not be turned off, nor should the flow temperature be reduced. Readiness is reached when the maximum residual moisture in cement screed is 1.8% (2.0% for ceramic tiles and natural/engineered stone) and 0.3% for calcium sulfate screed. Once readiness is confirmed, the screed temperature must be reduced gradually through a cooling phase lasting three days, with stepwise control of target flow temperatures.

Source: the full article is available on my website

ILWJ schrieb:

Can we lay parquet flooring now and continue drying afterward?

No.

Regards, Bauexperte

You should not install flooring without a CM measurement.
And I would strongly advise against moving into the house without finished floors—especially if you have children.

I’m just imagining how the children have to or are allowed to take a nap while work is being done inside the house. Or that the children aren’t allowed to go anywhere because the cables are still exposed, etc.
It’s probably not very suitable for children!
I hope this isn’t another case where a landlord terminated the lease or sold the apartment before it was even clear that the house would be finished. By now, it should be well known that this often doesn’t work out!
So far, there’s little information available.

milkie

I would avoid moving into an unfinished house either way. By moving in, many or usually all aspects are considered accepted by default.

Is it safe to assume we will no longer receive any feedback regarding our questions, as can be seen from the profile?!