1. Drying of concrete screed
  2. Drying plaster
  3. Air dryer: how to properly dry plaster?
  4. Recommendations from Osushiteli.ua: dryers for repair

A company performing repair work should always have an air dryer available in order to quickly and efficiently perform its work, including drying the walls after repair.

Air humidity has a negative effect on the speed and quality of finishing works. Industrial (semi-industrial) dehumidifiers significantly shorten the time and improve the quality of construction tasks such as plastering, puttying, wall painting, pasting wallpaper, pouring floor screed, etc.

Drying of concrete screed

When pouring the floor screed it is necessary to take into account that it takes about 28 days for 100% drying. In the first week, the screed dries by 80%, and it dries to 100% in another 2-3 weeks. The process of dehydration and hardening of cement mortar depends on the quality and grinding of cement fractions, the presence of modifiers and plasticizing additives, as well as on the temperature and humidity of the surrounding air.

The best hardening of concrete takes place in the warm season. The low temperature of the surrounding air slows down the process of setting and hardening of concrete. At air temperatures below zero, the water inside the mixture can freeze, hydration in the cold is completely stopped.

Therefore, it is necessary to maintain a fairly high temperature and remove excess moisture from the air in the room where the concrete screed is drying. This is especially important when you want to make repairs as quickly as possible, and preparing a screed for parquet or a warm floor, for example, can take about 30 days until it dries completely.

The conditions of screed drying in closed rooms are precisely controlled and the time of work is reduced when using it industrial dehumidifier. Moreover, the whole room is dried: not only the screeds of the floor, but also the walls and ceiling.

Drying plaster

When performing plastering work, it is important that the air temperature for drying finishing materials is in the range of +18-20°С, and the air humidity does not exceed 65%. Even drying takes place in the complete absence of drafts, otherwise the quality of the dried plaster will be low.

The applied plaster, depending on its composition, with natural drying dries in a different amount of time. On average, a 1 cm thick coating takes a week to dry. Drying of plastered and putty-coated walls depends on the composition of the mixtures (gypsum, cement, lime, plus additives), and can take from 7 to 15 days. Usually, the manufacturer provides data on the drying time of a 1 mm layer of the coating mixture under specified conditions of temperature and air humidity.

Drying the walls of buildings after renovation or in a new building naturally takes several weeks on average. Therefore, finishing works are often carried out in the summer.

And the use of heat guns in cold rooms to increase the air temperature and accelerate the drying of the plaster entails a number of additional costs (for fuel, electricity). In addition, difficulties arise with the possibility of supplying sufficient power from the power grid for the operation of these powerful heat generators. At the same time, there is a serious threat of overdrying and cracking of the surface layer of plaster already after the work has been completed.

Air dryer: how to properly dry plaster?

An industrial dehumidifier will help to dry the plaster in the best quality without unnecessary expenses.

Its use allows:

  • accurately control the level of air humidity using a hygrostat, removing excess moisture from the air from the entire volume of the room;
  • dry the plaster evenly and gradually, layer by layer, to the full depth, without compromising quality;
  • exclude air heating to high temperatures to accelerate moisture removal;
  • do not depend on external factors (temperature and humidity of the outside air), reduce heat losses of the building associated with constant ventilation;
  • significantly reduce construction costs.

The dehumidifier perfectly helps in high-quality drying of the walls, significantly shortening the period of finishing works. With the help of an adjustable hygrostat, the required level of humidity is set, which is automatically maintained by a dehumidifier, and gradually, over several days, the humidity decreases to the required limits acceptable for dried plaster.

With the help of dehumidifiers, the humidity is controlled automatically, while the plastering is performed, and there is no need for ventilation to remove excess moisture from the air. Due to the fact that dehumidifiers, both household and industrial models, work in a wide range of air temperatures, finishing works can be performed even in the cool off-season.

When pasting wallpaper (especially expensive ones) it is important to evenly, gradually and qualitatively dry the walls. A mobile dehumidifier will also be useful for this.

We also recommend an article on types of air dehumidifiers and their use.

In some cases, it is profitable to use the service of renting air dryers from Osushiteli.ua.

If you want to find out more information from our specialists, or get a free consultation, choose equipment for drying screed or plaster at your facility, you can call us (044) 225-00-15, or order Call back.

Recommendations from Osushiteli.ua: dryers for repair


Type of dehumidifier:

Trotec TTK 170 ESO


50 L
90 m2

More details
Buy in one click


Type of dehumidifier:

Celsius MDH50


50 L
100 m2

More details
Buy in one click


Type of dehumidifier:

Eurgeen OL50
50 L
200 m2

More details
Buy in one click

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Other useful articles and solutions:

What to do if you were flooded or you flooded your neighbors?

Types of humidity and why you need a dehumidification system

How to properly dry the plaster during the repair process


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