For many years, especially before the entry into force of the current Technical Building Code (CTE), rehabilitation of facades in the communities of owners was intended to remedy defects and sanitation of the blind part of the facade (walls ) leaving out an important part of it as are the windows where virtually no intervention was not performed. Today, a complete restoration of the facade must consider both the facing and window areas.

Rehabilitation of holes and windows is essential as it usually and especially in existing buildings, both holes like glazed windows are the weakest parts of the building envelope, in fact, it is part of the facade through which the largest energy losses in both heating and cooling occur.

The rehabilitation of the holes and front windows must be aimed at getting maximize performance required of windows such as air permeability, water tightness, wind resistance, thermal and acoustic insulation, mechanical strength, durability and anti-vibration.
the rehabilitation of pits and front windows, and for windows fulfill their vision functions, natural lighting and ventilation must be considered various factors including the type of frame and the type of glass to be used to achieve a level of thermal and acoustic insulation right.

Interventions most used windows for thermal and acoustic rehabilitation of holes and windows are double glazed, sobreacristalamientos, double windows, complete replacement of the window and reflective films. The choice of rehabilitation system best suited for each window will depend on the type of exterior carpentry (aluminum, pvc, wood. . ).

Double glazing

The rehabilitation of double glazed windows, also called insulating glass unit (UVA), is to replace the single crystals by double glazing constituted by two separated by a simple glass tube. sobreacristalamientos the case of (technical not widely used even in Spain) it is overlaying the existing and glass by various fastening systems, a new glass or transparent plastic. By a peripheral sealing gasket gets to the window and thus guarantees the thermal insulation thanks to the air chamber left between the existing glass and sobreacristalamiento.

Other solutions in the thermal rehabilitation of holes and windows, perhaps more expensive, involve providing a new window on the inside or the outside of the window moving support and with the existing situation (double glazing), the total replacement of the window, sometimes necessary when the degree of deterioration and degradation of the window is very high and finally, the reflective film technique, which adhere to the plastic films with special glasses vacuum metallizing treatments. Finally the use of Low-E glass and glass control plotin rehabilitation of holes and windows improve the performance of thermal insulation and solar control windows.

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