From 2030, a home cannot be sold or rented in Spain that does not have an energy certification of at least letter Dmore than the level of most properties, which were built before efficiency obligations began to exist in the 1990s. For raise the bar to the minimum requiredthere is a isolation technique that gains more and more followers, cheaper and that can be ready in a single day. Without commercial transactions involved, it also provides greater thermal comfort and a savings of up to 30% in household energy expenditure.
It is the call blown insulationwhich consists of injecting into the air chambers that most homes have between the interior walls and the exterior walls or in the ceilings materials such as rock wool, mineral wool, cellulose or wood fiber. It can be done from inside the home or from outside, depending on the size of the property or its air chamber, it can be done in a single day and is cheaper than using other types of coatings.
Furthermore, it is contemplated in the Energy Savings Certificate system (CAE) of the Ministry of Ecological Transition, so that if you use an installer who can issue them you can obtain a discount. Once placed, it does not take up space in the home nor does it require maintenance and is resistant to water, insects and rodents and also achieves acoustic insulation, reducing noise that passes from the street.
Blown insulation is a technique that more and more owners are resorting to improve the insulation of your floors and cut heating or air conditioning bills and, in the process, reduce the level of noise coming from the street. Looking to 2030, most homes in Spain will need to raise the energy category to at least the letter D, it will be mandatory to be able to sell or rent it.
Specifically, the 60% of residential buildings in Spain They were built without any energy efficiency regulations, according to the Institute for Energy Diversification and Saving (IDAE), dependent on Ecological Transition, which contemplates building rehabilitation as one of the key categories of action to reduce energy consumption and expenditure and, within it, prioritizes investments over thermal envelopes of buildings, on facades and roofs and the change of doors or windows, for example, the change of boilers.
According to the installation company ASC Aislamientos, it is a technique “quite booming” because most homes were built before a certain level of insulation was required. Precisely, The oldest ones are where they are most noticeable. the benefits, because they do not have any other isolation measures.
Among the great ones, Iberdrola has already rehabilitated this way thousand homes since it launched its solution in 2022 Smart Insulation. In round figures, these actions are equivalent to a saving of 1,500 megawatts per year, energy consumption of 500 homes already a reduction of 280 tons of CO2 each year.
Among the “advantages” that they point to in ASC, it appears that it is “fast” because the material is injected into a hole that already exists and “the work can be done in a day, at most two or three”, depending on the size of the air chamber and the size of the home. Furthermore, they point out another key element, that the isolation can be done individuallythat is, it is not necessary for the entire community of owners does so, which avoids the problem of neighbors “almost never agreeing” on these issues.
According to the estimates offered by other companies in the sector, the blown-in insulation of the façade of a flat can cost between 1,100 and 1,300 eurosbetween 1,200 and 1,400 if it is a semi-detached villa or between 2,500 and 2,700 if it is an individual villa. Filling a false ceiling on an area of ​​100 square meters can cost between 1,600 and 1,800 euros.
According to some of the work carried out by Iberdrola, an 88 square meter house in the northern area of ​​Madrid and built in 1975 with an F energy rating improved two levels of the classificationup to D, after a blown insulation performance. With the same technique, a 170 square meter duplex built in 2003 improved its energy rating from D to C. With the two letters its owner could sell or rent but while his Energy consumption will fall by 30%.