How to organize the ventilation of premises with swimming pools


For obvious reasons, swimming pool areas require a special approach in terms of design, selection of equipment and installation of an air ventilation system. However, the pool dehumidifier itself is far from the only measure that can be taken.

Unfortunately, there are far from isolated cases of resonant litigation on the claims of citizens and organizations dissatisfied with the work of contractors involved in the construction and equipping of swimming pools. Most often, the following problems cause complaints: moisture damage to building structural elements, excess condensate; fungal formations, mold, corrosion of elements of equipment and decoration, etc.
In contrast to these cases, we can mention hundreds and thousands of normal complexes with swimming pools, where nothing exfoliates, moisture does not destroy building structures and fungi do not form. The difference between a problematic and a successful construction lies only in the qualifications of the specialists responsible for the design of the building and engineering structures, as well as in the presence or absence of the necessary degree of interaction between all participating services and organizations.

Here are the main requirements that must be met during the construction and operation of a building with a swimming pool:

  • Structural elements of the building must be able to function normally at elevated dew point values.
  • The building must constantly maintain a level of relative humidity in the range between 55% and 60%. Drying and control equipment must operate 24/7. In this case, the appropriate level of humidity is more important than questions of economy.
  • All air ducts must be sealed. Humid air must not enter the cold compartments of the room.

Why control humidity?
Controlling the level of air humidity is vital for the proper functioning of a building with a swimming pool. Regular violation of this parameter is guaranteed to lead to the destruction of structural elements. That is why the designer, together with the ventilation and air conditioning specialist, must pay close attention to the control of the dew point and the implementation of measures to prevent the formation of condensate.
Prevention of moisture condensation avoids such complications:

  • The appearance of mold and fungi on the walls;
  • Corrosion of wiring and metal parts of various equipment;
  • Misted windows;
  • Destruction of the fastening elements of the main structures and, as a result, the destruction of the main building structures.

Here are a few tips to help keep buildings safe from these problems:

Walls, ceiling
The inner surface of the walls must be reliably protected from moisture. Exterior walls are always colder (in winter) than indoor air, and therefore are particularly susceptible to its accumulation. The structure of the waterproofing layer should exclude the possibility of «bridges» for moisture to enter the walls.

Air temperature and dew point indoors
The internal dew point must be at least 2.7 degrees below the temperature of the coldest elements in the room. In this case, when air enters these very elements, its relative humidity does not overcome the mark of 90%. As a result, there is no condensation on the surface.
For the comfort of people using the pool, it is recommended to maintain a relative humidity of 50-60%. Otherwise (if the humidity is less), the water from the body evaporates too quickly, which is not very comfortable. The air temperature is maintained from 26 to 30 degrees (depending on the purpose of the pool or the preferences of its owners).

Swimming pool and other facilities
It is recommended to separate the pool area from other areas of the building using walls and doors. An attempt to combine halls of other functions (bars, gyms, living rooms, etc.) with a swimming pool creates many additional problems for designers and, as a result, rarely gives a long-term positive result.

Air pressure
To ensure proper air movement, a slight negative pressure must be created in the pool area. In this case, humid air from the pool does not enter other rooms that do not have appropriate preparation.

Dropped ceilings
Suspended ceilings for the pool — not the best solution. Even the use of special moisture-resistant plates does not guarantee the absence of problems with the accumulation of moisture.

For obvious reasons, windows are the area where moisture condensation most often occurs. To solve this problem, it is necessary to provide for blowing glass over the entire width of the window with warm, dry air.


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