Q.Can you build my house on my design?
Yes, of course - as evidenced by the photos of prefabricated houses, using this technology we build houses and buildings of varying architecture, distribution and functions. Restrictions for Bulgaria are limited to the fact that usually two-storey houses are built (but already designs for three-storey houses are offered). The wooden houses abroad are up to six-storeys high.
Q.What are the heat-shielding and soundproofing qualities of these buildings?
This is a construction system that gives the best performance in this area. Only by this construction method can be built in the developed countries the low-energy and passive houses of great current interest. A low-energy house is considered a building that under different weather conditions in Europe needs 30 to 70 kWch / m2 heating or cooling per year. This is equivalent to 3 to 7 liters of liquid fuels or to 3 to 7 m3 of natural gas. Wooden prefabricated houses long ago covered this standard. The next highest category of low-energy buildings are the so-called 3-liter houses. This is a building that needs 3 liters of liquid fuel or 3 m3 of natural gas, or less than 30 kWh per 1m2 of living space for year-round air conditioning. Such buildings are already massively built by prefabricated wooden supporting structure. In these buildings, the requirements to the windows are greater, which must be of wood or plastic with a 3- layered glass package. The highest category of low-energy building belongs to the so-called passive house. The energy costs for its microclimate maintenance are under 10 kWh/m2 of living space per year, which does not need to be imported as an additional energy amount, but can be ensured by the energy released in the house use (cooking, bathing , human heat, lighting, refrigerator, etc.) and by the sun accumulation (good exposure, solar installations). The heat released or penetrated in the home is captured by the filtration system with heat pumps and is accumulated in a special heat exchanger, from where it can be used when needed. Special computer systems and programs are created for the management and use of such houses. Of course, for Bulgaria it still sounds exotic, but it is the future. You may ask yourself the question why such houses can not be built in the traditional way? The answer is: The outer walls of these houses should have a thermal insulation coefficient below 0.2 W (m2 ° K) for low power and 0.15 W (m2°K) for the passive houses. In order to achieve these parameters, the thickness of the wall fabricated of: - Multi-layer panel with a wooden supporting structure reaches up to 30 - 35 cm - The reinforced plastered wall of over 10 m – it is virtually impossible - Plastered brick wall (fours) - its thickness should be 140 - 160 cm - Porous concrete wall (Ytong) - 1.00 m - Solid wood wall - 70 cm Therefore, to improve to some extent the thermal insulation parameters of the monolithic buildings, additional external thermal insulation is applied, but the elimination of all thermal bridges is virtually impossible. Once become convinced that these buildings are unbeatable with their insulating capabilities, customers want to know if the other parameters of the building meet the construction requirements and whether they are comparable to the monolithic buildings.
Q.Are the houses resistant to fire?
1. Surveys in many countries show that fires almost never start from the building structures, but always outside them (electric appliances, clothes, books, furniture, chemicals, etc.). 2. Plasterboards used in the panels or the mineral wool, which are nonflammable and fire-resistant materials protect the structure from fires. 3. If, however, the fire is so intense to reach the structure (usually, in the normal building this happens after 30 to 60 min), here the unique capabilities of wood as building material take effect, namely: - Wood does not change its carrying capacity at high temperatures (as opposed to metals). - In the process of burning, on the wood is formed a layer of charcoal, which dramatically slows down the combustion process in depth. 4. All this is well known to the specialists, therefore this type of buildings are trouble-free used not only for housing but also for public buildings, children's homes, nursing homes, administrative buildings, hotels, etc. 5. Finally, it should be kept in mind also the following: - For special buildings with special requirements, chemicals that make the wood practically non-flammable are already available. - If in any ordinary building a large fire occurs for some reason that can not be extinguished for hours, any building becomes unusable or its recovery is much more expensive than the new construction. - Wooden buildings have the advantage - clearing of the terrain is several times faster and cheaper.
Q.Are the houses resistant to flooding?
In case of flood, water that bathes these structures does not absorb them, since the moisture storage capacity of the building materials is within a few percent for 24 hour water impact. Given the small volume of water the building material would absorb, its quick evaporation is sure. This process is accelerated by the special design of the walls with vertical air circulation inside them. In variable atmospheric humidity, these buildings have excellent behavior thanks to the specific properties of the wood and gypsum, which easily absorb and transfer atmospheric moisture without it to condense on them. As an additional measure, wood elements that have contact with the concrete base and at a height of 80 cm from it are impregnated against moisture. Thus they are protected against any possible waterproofing breakthrough and possible infiltration of moisture from the foundations.
Q.Are the houses resistant to earthquakes?
The construction of prefabricated wooden buildings with a wooden frame is recommended for seismic areas for the following reasons. 1. The wood as building material is very elastic and tight. It bears large single loads and then resumes its original position. 2. These buildings have no monolithic (fixed) joints. All assemblies withstand some displacement without disruption. 3. Significantly lower weight of the construction contributes to the much smaller inertial forces, as well as to much less smaller casualties and burdensome rescue operations in case of eventual destruction.
Q.Why the houses are called environmentally friendly?
1. Energy savings - for the timber harvesting and processing and for the construction itself is used much less energy than in the monolithic construction process. As we said, the structures are several times lighter and the energy consumption is much lower than in the monolithic construction. For the house operation significantly less energy is used because of their exceptional insulation properties. And energy saving is the best indicator for the Conservation of Nature. 2. Environmentally friendly for living: - All materials used are in the construction of the houses are natural, with minimal or no chemical treatments and additives. - Wood and gypsum boards are the humidity natural regulator in the rooms. - The microclimate in the building is controlled very quickly and economically. This is due to the fact that the construction of these buildings is neutral to the heat (it does not accumulate heat), i.e., if you want to change the temperature in any room, it is only necessary to cool or heat the volume of air inside without worrying that you have to heat and cool the walls, floor and ceiling. This effect is strongly felt in the buildings that are not occupied permanently.
Q.What’s the life span of these wooden houses?
The life span of a building, no matter of what type, is determined by three conditions: 1. Will the materials used in the construction undergo aging and will they lose their qualities over time? It was proved that if the wood, as the main construction material, is not affected by external pests, it does not change its properties over time. Therefore, some measures are taken to prevent pests: The wood used in the structures is not of lower than the IInd grade (i.e., no diseases and pests). - The wood is dried in chambers at a high temperature to destroy the eggs and larvae of pests. - In some instances, wood is additionally impregnated. 2. Whether the manufacture and installation are performed professionally. 3. Normal operation and maintenance of the building. Practice shows that timber frame buildings are operated successfully for 100 years or more.
Q.What are the prices of the prefabricated houses?
The value of a wooden prefabricated house is determined depending on the items selected. How would your house cost? - The price of one-storey house is 195 EUR / m2. - The price of tow-storey house is 245 EUR / m2.