Wooden buildings - dry floors

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With the change in the technology of construction of family houses and not only family houses, but significant technological changes also have taken place in recent years, which lead to large energy savings necessary to ensure the well-being of living and climatic conditions in the house. The technology of the perimeter and ceiling panels, which are designed by the designers and designers, has been developed to a relatively good parameter to date, and if the installation company executes all the technologies recommended by the designer with regard to the thermal permeability of the walls considerable energy comfort.

The building as such consists, as is known, of large parts and components. Today we would like to touch on the issue of floors, their anchoring and assembly.

It is a common occurrence at the beginning of the construction of a family house (timber construction) that a substructure is built, the so-called foundation slab in such a form and weight as if it should carry several storeys built wet way (brick house). Few companies on the market that I have met in my many years of experience offer and are able to install a so-called floating base plate or honeycomb structure. From my point of view, it represents better thermal insulation and hence "cheaper assembly". The foundation slab is derived from the word foundation and hence the foundation of the house. Today's construction of the foundation slab with regard to the performed assembly of the superstructure (timber structure) should be carried out in such a way that it meets the thermal insulation properties for the superstructure and that the foundation slab does not disturb the heat transfer coefficient in the calculations. This is the first basis of quality construction.

In my practice, I have already encountered several cases where the assembly company used a levelling cast concrete on a high-quality foundation slab with all thermal parameters and then in a larger volume of levelling trowel and thus paradoxically committed a bad technological procedure with regard to the superstructure used. As a result, the ceiling structure (SDK boards) sagged and corrugated.

A newly built house, which is so physically loaded and plenty of water in the levelling mass is poured into the floors, is not able to do this with the present architectural concept of buildings and the preference for large glass waveguides. equalize. The proportion of interior walls decreases and in case of poor ventilation or high humidity the so-called lenses (part of the perimeter and partition wall construction, which serves both for ventilation and for easier management of eg wiring and other assembly elements in the house, usually 4 - 6 cm thick) are not able to hold this huge amount of water and damage occurs especially to the ceiling structure described above. In the absence of a blower door test (A, B), it is not known whether the inner envelope of the house to ensure the vapour tightness of the house (this applies to both diffused open and diffused closed buildings) is complete and intact and cannot be excluded, that the effects of the dampness of the construction of legs are long-term and fatal for the construction of the house.

highly recommend the use of blower door test methods to all my clients. I take the liberty of turning, and to refresh the specification of method A and B and their use in the construction phase and after completion of construction, I enclose the following information.

The "B" method is used to verify the tightness of a simple envelope of a building with the exclusion of technological passages (sewerage, air conditioning, flue gas ducts, etc.), which will be closed in their own way in the completed building. It is therefore performed at the time when the building envelope is completed, but access to the main airtight layer is possible, which can be repaired during the test. For this test, the building must be prepared. Close the HVAC openings with special sealing agents (plugs, bag closures, temporary adhesive tapes, foils) and thus eliminate their possible leakage due to incompleteness. Obvious defects and unfinished work can be traced and sealed several times by inducing a pressure difference compared to the test. This part is the most time-consuming and, depending on the quality of the construction, can take several hours, however, it has proved useful to our clients, for example when detecting leaks in electrical wiring or using not very suitable electrical installation material, especially in wooden buildings.

Method "A", on the other hand, is a certification measurement, where in the completed and operated building the air permeability is measured by closing the technological equipment by their own means (pouring water seals, closing chimney drains, closing air dampers, etc.). For this reason, the equipment installed must allow such self-closure, independent of the energy supplied. It is not possible in case of power failure. energy to keep the openings of air conditioning with holes with a diameter of 100 mm and more in the building, where we have eliminated even smaller leaks with all our might. A big problem is a correct and controllable connection to the necessary supply of combustion air in the heaters installed in the interior (fireplace stoves and their derivatives). In essence, however, this test is simpler and shorter, as there is no longer much to change on the completed construction. In both cases, however, the same equipment, the same measurement procedure and the same detection technique are used. From my practice, I also note and remind you when mentioning this type of test, the so-called climb to the ground, where it is necessary to follow the technology for wooden buildings, supply a certified product and thus avoid unnecessary heat leakage.

However, let's go back to moisture and floor anchoring. In my opinion, the only right solution for a wooden building is the installation of so-called dry floors. To date, there are several manufacturers on the market who have developed very sophisticated systems for dry floor installation, namely:

  • both for clean floors (floors without underfloor heating)
  • so for floors with water underfloor heating
  • so for floors with electric heating

One of the suppliers is the company Fermacell GmBH, which has very well prepared manuals for laying floors. At the same time, it offers consulting services to both clients and designers. If you are interested and especially need advice with confidence, and we confirm it from our own experience, please contact Mr. Ing. Vlastimil Kolman, phone +420 724 500 310, who will be at your service.

Fermacell floor elements will provide and ensure you:

  • dry laying - no technological breaks, no additional moisture (dry construction system)
  • the increased protection against noise
  • safe base for all floor coverings

effective thermal insulation - insulated floor provides more comfort! And with the help of numerous variants of the Fermacell system, you will of course easily meet the requirements of the new regulations on thermal protection in relation to the values of the heat transfer coefficient for base surfaces (U ≤ 0.35 W / m²K).

Finally, it is necessary to understand that even if the floor is multilayered, it behaves in the same way in terms of heat transmission as the external cladding of a wooden building or ceiling structure.

What we have described today concerns the insulating properties of the house floors and it is only one of the properties of the house that deserves attention. Equally unforgettable and the above mentioned is associated with the floor impact sound insulation.