What is insulation material 1

What types of injected insulation are on the rise?

A thermal insulator is generally the material used in construction and other industries to improve the thermal behavior of the building envelope. All the materials used in construction do a greater or lesser degree Resistance to heat transmission. In some cases, such as metals, this resistance is very low. Other more traditional materials such as wood or brick offer medium resistance; and finally there is a group of insulation materials that offer very good behavior and high resistance.

Under theThermal insulation, we can differentiate between mineral wool, extruded polystyrene and polyurethane foam. However, it is necessary to understand that the insulation of the building envelope is not just one improved energy efficiencybut also guarantees the health of the building.

Correct configuration of the building envelope is fundamental to ensuring health and comfort inside the building. This is why the current legal provisions stipulate the minimum insulation required to guarantee thermal comfort and air quality inside the building.

 

The isolation of air chambers

When we get over the insulation of building facades talk, we are referring to the most often due insulation of two-layer walls with air chambers. These are those walls that consist of two parallel rows of bricks or blocks, the space between which is called an air chamber. Filling this air chamber is essential in ensuring proper insulation in accordance with applicable regulations.

Depending on the condition of the interior of the chamber, the age of the building and any thermal bridges, the choice of insulation material and technology is one way or another. The Injection techniques however, they are very sophisticated and allow very good control during their use.

 

Advantages of injected insulation for thermal insulation of air chambers

Insulation by blowing or injecting is the easiest and most efficient way to insulate a house in less than 24 hours, with noticeable thermal insulation benefits from day one. Without major construction work there is no inconvenience for the residents and their use only brings improvements in thermal comfort and efficiency.

Injection is the most suitable insulation technique for insulating buildings with facades that contain air chambers. From 1930 until today it remains the most widely used solution in construction. Injection insulation achieves thermal insulation of all types of cavities and building types, and it can take place from the inside as well as from the outside.

 

The most widely used injected isolations

There are currently four main alternatives in injected thermal insulation on the market:

  • Polystyrene (extruded or expanded).
  • Polyurethane systems.
  • Cellulose.

The outlines of the holes, the cladding fronts or the joints between the roof and the facade are some of the most common Special areas under construction and need to be analyzed. This makes it possible to choose the material that best adapts to the characteristics of each individual building project.

In addition, the properties of the product must be taken into account. Examples of these are the insulation ability against winter cold or summer heat (depending on the area in which the building is located), the capacity to fill chambers smaller than 5 cm, the minimum drill hole diameter and the number of drill holes required, fire behavior, water resistance and water vapor permeability.

 

The injection of polyurethane systems for the insulation of buildings

There are several types of injected insulation, which is polyurethane, thanks to its ability Energy efficiency to improve the building significantly.

Rigid polyurethane foam is a permanently plastic plastic, particularly strongly cross-linked and infusible. These properties mean that polyurethane, in the usual densities required for correct thermal insulation, only contains a small proportion of the volume of the solid (with a density of 30 kg / m3 only about 3% of the solids volume). This enablesa high degree of insulation in very narrow and difficult-to-access air chambers.

The case of theInjection into air chambers requires special attention, both in assessing suitability and execution.

In order to guarantee the correct insulation performance at all times, the injection is carried out with a special drill. The maximum distance between the boreholes, which are on staggered lines, is 1 m. The injection must start in the lower part and the air chamber slowly filled from bottom to top, which is due to the low density of the polyurethane (between 8 and 12 kg / m3 with free expansion). The air chamber must be filled by slow foam formation without causing excessive tension in the adjacent materials to avoid cracks.

In addition, polyurethane systems add structural strength to the building, they have good adhesion to various surfaces, they improve the vibration damping of surfaces and they do not absorb environmental moisture. That's whythe injected polyurethane one of the most widely used insulation products in recent years.

 

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