Often asked questions about passive housing

What are the advantages of prefabricated houses over other types of construction?

The advantages are many, but the most important are: energy efficiency, which leads to multiple reductions in heating and cooling bills; extremely earthquake resistance; fast execution; light construction; the ecological materials used for construction. This method of construction also ensures greater usability of the built-up area, as the thickness of the external and internal walls is smaller, and at the same time has better insulating properties. The qualities of the materials and the internal conditions that are created by this type of construction are a prerequisite for a unique feeling of coziness and comfort of living.

Why prefabricated houses are better than monolithic construction?

The main reason is that many of the activities are carried out in the factory. ECOZID has specialized software for wooden structures, through which the design of the prefabricated house is done in 3D. Then, through direct import in an automated line, all the elements necessary for the construction of the house are produced without human intervention. With these elements, the panels of the prefabricated house are produced with the help of a hydraulic stand with dimensions 12x3 m and pneumatic tightening, which is a guarantee for high quality.

What are prefabricated houses?

These are buildings for the construction of which prefabricated modules are used in factory conditions. They belong to the so-called "dry construction", which is construction that does not use wet processes. Prefabricated houses in Bulgaria can be divided into several groups:

1.With skeletal-beam constructions, the main structural material can be wood or metal. 2.Constructions with logs. 3.Panel-modular constructions.

Is there a limit from an architectural point of view in the construction of prefabricated houses?

No, there is no such restriction in the construction of prefabricated houses and they can be classic, modern or bearing the spirit of older times.

Can prefabricated buildings be inhabited all year round?

The technology for prefabricated construction can be used to build seasonal buildings, production buildings, offices, commercial sites as well as residential buildings with high performance characteristics with incomparable living conditions. Prefabricated houses, due to their construction and the materials used in their production, can most easily be built as low-energy or passive houses. The latter are buildings that meet the highest European standards for energy efficiency and thus create excellent comfort conditions for year-round living.

What are prefabricated houses made of?

The materials used for the construction of prefabricated houses depend on their purpose and production technology. Wood or metal is most often used as the main structural material. In cases where the prefabricated house must have the characteristics of low energy or passive, the better option is for the construction to be made of wood, as we know that metal is a conductor. It results in thermal bridges and solving them requires more effort and resources. The materials used are environmentally friendly and natural.

What regulations must prefabricated houses comply with?

In the design and construction of prefabricated houses all regulations apply, as in monolithic construction.

Are prefabricated wooden houses fire resistant?

Contrary to many people's expectations, the wood used as a load-bearing structure performs very well in a fire. It does not flake, split, melt, bend or explode. The wood burns evenly at a predictable speed. The charred layer that forms on the surface serves to insulate and protect the interior of the elements.

Research in many countries shows that fires almost never start from the construction of buildings, but always outside them. The gypsum boards or mineral wool used in the panels, which are non-combustible and fire-retardant materials, protect the structure from fires. If, despite everything, the fire is so strong that it reaches the structure (usually in normal buildings this time is after 30 to 60 minutes) comes the unique abilities of wood as a construction material, namely:

1.It does not change its bearing capacity at high temperatures (unlike metals);

2.In the process of burning, a layer of charcoal is formed on the wood, which sharply slows down the burning process in depth.

Are prefabricated wooden houses environmentally friendly?

Definitely, prefabricated houses with wooden construction are environmentally friendly and this can be considered in two directions:

1.The method of production of the materials used in their construction is energy efficient and uses technologies that spare nature. For the most part, they are natural. When these buildings are demolished, all materials are also recyclable and do not harm nature.

2.Due to the main characteristics of these houses, especially if they are in the group of low-energy and passive buildings, the harmful emissions that are released in nature from daily activities are minimized. The good thermal insulation and sealing of the house makes the living cozy and the costs for heating and cooling minimal. This in turn protects nature and creates an environment close to nature due to the natural origin of the materials used.

What is the lifespan of prefabricated buildings?

Prefabricated houses with wooden construction today are the heirs of the old Bulgarian houses, which are already 200-300 years old. At the time they were built of wooden beams, the walls were woven of wood and plastered with mud. Today, prefabricated houses are built on a similar principle, but with new, modern materials and technologies. Each house is designed to withstand wind, earthquakes, etc. So it is safe to say that modern prefabricated houses are at a higher structural level and are more resistant to all climatic and other challenges.

What is the lifespan of prefabricated buildings?

Prefabricated houses with wooden construction today are the heirs of the old Bulgarian houses, which are already 200-300 years old. At the time they were built of wooden beams, the walls were woven of wood and plastered with mud. Today, prefabricated houses are built on a similar principle, but with new, modern materials and technologies. Each house is designed to withstand wind, earthquakes, etc. So it is safe to say that modern prefabricated houses are at a higher structural level and are more resistant to all climatic and other challenges.

What is the warranty of the construction?

According to the Spatial Development Act in Bulgaria the warranty of all structural parts is 10 years, and of the finishing works 5 years.

On how many floors can a prefabricated house be built?

Widespread projects are for one-story and two-story houses, but nothing prevents the construction of taller buildings, which in countries with such construction is done by reaching 6-7 or more floors.

How long does it take to build a prefabricated house?

Due to the specific construction technology, the prefabricated house has much shorter construction times. It takes between 3-4 months to complete a medium-sized house, but of course this depends a lot on the type of finishing work.

At what time of year can prefabricated houses be built?

The construction of a prefabricated house is possible all year round, regardless of the season. Modern materials allow to build foundations in the cold winter months. The construction of the house itself is produced in factory conditions and climate change has no effect. The installation of the house itself also does not depend on the climate, as there are no wet processes and there can only be a short break if there are storms or heavy rainfall.

Can you build the building according to a project prepared by another company?

It is desirable that the set of projects required for the issuance of a permit and construction be prepared by the designers of ECOZID because this facilitates construction and does not dilute the responsibility. However, if the Assignor wishes, he may assign the design to other designers with the exception of structures and electrical. This is necessary due to the specifics of the technology of production of houses by ECOZID. The company works with specialized design software, which is directly imported into an automated line for the production of prefabricated houses. With minimal human intervention, all the elements needed for high quality construction are produced.

How do I get an offer for a prefabricated house?

Please click HERE  or HERE and you will receive full information about the preparation of an offer.

What documents are required when signing a contract?

1.Notary deed certifying the ownership of the investor.

2.Current design visa from the Municipality where the building will be built.

3.Preliminary Connection Agreement with the respective electricity distribution company.

4.Preliminary Connection Agreement with the respective Water and Sewerage Company.

5.Accepted offer by the Assignor, prepared by ECOZID, which is an annex to the contract.

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