Lleida, Nov 26 (EFECOM) .- Three Lleida surveyors have come together to create a new construction company, Behabitat, which offers, as a novelty in Spain, the construction of passive multi-family homes, that is, self-sufficient buildings at the level of energy resources and made in wood.
Its objective is to ensure that cities have tall buildings, multi-family buildings, made with wood and totally passive.
Until now you could find construction companies that build passive but single-family and isolated houses, and there are beginning to be buildings in cities made of wood – there is even one in Lleida city – but they are not self-sufficient in terms of resources.
“After working in the construction management of several construction projects of this type, we saw that there were things to improve and that we could give them a solution. We offer rational buildings, in which environmental costs are reduced as well as economic ones ”, one of the partners, Oriol Aubets, explained to Efe.
But in addition to that rationality, their houses are completely made to suit the client and with finishes like those of a traditional construction.
“We do not make prefabricated houses but we industrialize the process of building a house. All are made to measure and taste of the client, they can even have a ceramic facade, coated, as they wish, although it is true that we give priority to dry construction technologies for a matter of speed, so that the execution time of a single-family house is about four months on average, ”says Aubets.
Although for now it has not carried out the construction of any multi-family building, Behabitat has already built passive wooden houses in urban framework with energy classification A and has several pending projects throughout Catalonia and the rest of the State.
“A passive construction does not need to consume energy resources and the few it consumes it generates itself,” explains the builder. This is mainly achieved by the watertightness of the house, which in the case of Behabitat is generated by the construction in light wooden framework.
“We promote the insulation of the house by building with a light wooden framework combined with different insulation and more effective enclosures than in other types of constructions, so that the level of uncontrolled air infiltration is zero”, details Aubets.
Despite this tightness, they also guarantee a high quality of indoor air in the house. This is achieved by installing a heat exchange machine in each home, which, in addition to ventilating the rooms of the house, guarantees the salubrity of the air.
“We capture the clean and fresh air from outside and we pass it through a particle filter that ensures that the air that enters the house is free of allergens. The incoming air intersects the outgoing air, which is warmer, and thus we achieve a low temperature differential between the two ”, Aubets comments.
In spite of everything, the houses still need minimal support from air conditioning and heating, but it is generated by the house itself using solar panels, so that the construction is self-sufficient.
“In mountain areas where it is colder we play more with the orientation of the building to the sun and with the enclosures, which in this case will have triple glass with an air chamber. But if there is no minimum solar contribution, passive houses are not achieved, since it would not be efficient to have to put many solar panels. Our philosophy is, above all, to achieve rational buildings, that is our contribution ”, assures the businessman.
As for the construction price of this type of house, it is similar to that of the traditional ones, although with important differences at the level of consumption.
“Our average price is 800 euros per square meter, which can go up or even down depending on the finishes and design. But the important thing is that our homes do not generate environmental costs and above all they significantly reduce energy consumption, since a traditional single-family house consumes an average of 1,800 euros a year and our houses about 300. This is a not inconsiderable saving ”, he highlights.
Part of the cost of the house is due to the fact that, although they use lightweight wood framing for construction, cheaper and more environmentally sound than the solid wood panels used by other builders, the wood has to be imported.
“It is a pity that we have to bring the wood from Austria because here the sector is in the hands of very few and the prices are so high that it is more convenient for us to bring the wood from outside, with all that this entails”, Aubert notes.
In any case, Behabitat guarantees that the wood they use in their homes never comes from wild forests but from forests created for logging. EFECOM