MICROWAVE  DRYING  OF  BUILDINGS

The lack of water insulation, damaged insulation, plumbing failures, damaged roof sheathing, leaking drainpipes or fire brigade operations are the most common cause of excessive dampness in foundations, walls, constructions.
Most of the water in building constructions (walls, partitions, foundations) is located in capillaries, small hollows or between packages and grains. 1m3 of brick wall can absorb over 200 liters of water.
The traditional dehumidifier receives moisture from the air that has previously surrounded the wall surface. Most of the water collected by such device is moisture, which flows into the room from the outside with damp air. The effectiveness of the air dryer depends on the room volume, climatic conditions and the amount of the fresh air flowing from the outside.
A photo gallery of services provided by MARKOM can be seen here.

FOUNDATIONS  AND  WALLS  DRYING

It is estimated that microwave drying is 4 to 6 times faster than using other methods. Walls and foundations are dried throughout their entire cross-section and not just on the surface. The type of material, the thickness of the partition, the size of the room or climatic conditions are not relevant.
Microwaves penetrate deeply into the wall structure, causing rapid heating of each small portion of water that is located there. When the water vapor exits outside, it gives the heat to the surrounding material. Raising the wall temperature is therefore a side effect of the drying process.
In reality the wall can be effectively dried when its temperature is around 60 oC. When the wall temperature exceeds 140 oC, micro cracks may arise and the mortar begins to crumble. However, these damages are so small that they do not in any way affect the mechanical strength of the wall.
Microwaves do not damage cables, pipes, plastic components etc. the insulation of most cables is damaged at temperature above 140 oC. If the surroundings of the cable (in these case a wall) has a higher temperature, then the failure is inevitable. In this scenario guilty is the person operating the device, not the technology, because that person allowed the wall to be heated to such a high temperature.
In order to ensure the proper quality of services, users of devices manufactured by MARKOM participate in a course covering operation of equipment, the basics of OSH in work with microwave devices and the principles of performing services. More information can be found here.

DRYING  WOODEN  STRUCTURES

Let us consider drying wooden elements embedded in the construction of the building. Due to the location, the process must be slightly different than in a stationary dryer.
During drying the wooden elements, similar processes occur, such as when the walls or foundations are dehumidified. In addition to water, wood also contains a number of compounds well absorbing microwaves (proteins, salts, resins). Unlike walls, it is easy to heat even a dry wooden element to a high temperatures with microwaves. This property of microwaves is used, among other things, in the liquidation of wood pests. More information can be found here
Microwaves penetrate deep into the structure of wooden element, heating it also inside. Because wood is a bad heat conductor, the temperature drops rapidly on its surface, but inside it lasts a long time.
Wood is more sensitive to temperature than other building materials. Thermal stresses cause cracking of the wood, so drying should be carried out under strict control. In reality, effective drying takes place at temperatures of 60 - 100 oC. Higher temperatures are not recommended.
The ability of microwaves for rapid drying may tempt to significantly reduce the time of these works. Too intensive drying will, however, cause permanent deformation of thin boards, panels or panelling elements.

RESTORATION  WORK

The microwave technology brings invaluable help in the preservation of monuments. With traditional drying, there is a migration of water from the interior to the wall surface. The water carries minerals and salts. When drying walls with microwaves, the salting out on the surface is minimized. Microwaves cause evaporation of water particles inside the wall. However, the steam released outside does not carry salt and minerals.
Effective and efficient microwave drying is possible even when the temperature of the construction element does not exceed 60 oC. This is important for constructions made of materials sensitive to high temperatures or lime mortars. Such temperature also does not threaten wall paintings.
When drying, the size of the object, room volume, temperature and room humidity, wall thickness or location are not relevant.

MICROWAVE  DEVICES

For drying buildings, wooden constructions and restoration works the devices and sets manufactured by MARKOM are used. The proposed solutions were created based on many years of experience acquired while conducting this type of work.
Elements of additional equipment (waveguides, lifts) greatly facilitate the performance of services, even in the most unusual facilities. More information can be found here.

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