The CE marking has become mandatory for windows and exterior doors. The CE mark must be shown on all windows. The CE marking is the system that all manufacturers of windows, doors, curtain walls, shutters must conform to sell their products in the European Union. The CE marking is a declaration about the product compliance with the following basic requirements:
- mechanical strength and stability;
- resistance to air, water and wind;
- safety in case of fire;
- hygiene, health and environment;
- safety in use;
- protection against noise;
- energy savings.
A customers-oriented business has to pay attention to overall customer needs. For this reason the inspection phase is crucial for the implementation of these requirements, which must be taken into account first of all during the design phase and then during production and installation phases.
In this way the design phase becomes very important with its function of creating products that combine the technical requirements with the customer needs.
Thermal and sound insulation
The noise measured in decibels (dB) is perceived as an oscillation of air pressure picked up by the ear and transmitted to the brain. The sounds are not all the same, and can also be classified according to an intensity scale ranging from 0 to 130, which is fixed as the limit threshold of pain.
The sound insulation is used to report any type of noise within an acceptable threshold for the ear. The windows have an important role in reducing noise coming from outside. The sound insulation of a window, its sound reduction index (Rw), is measured in decibels (dB): higher is this value, better is the sound insulation and so greater is the hearing protection that can be offer.
The sound insulation is, therefore, the value of noise reduction that the barrier is crossed by the sound able to guarantee. The sound insulation of windows depends on the materials, glasses, gaskets and from the right connection with the building.
The thermal transmittance is an energy term which indicates the measure of the amount of heat lost per square meter, in stationary conditions, for the effect of a temperature difference between inside and outside.
The unit of measurement through which indicate the insulating capacity of a window is the value Uw (where w is for window): smaller is this value, better will be the thermal insulation given by the window. When choosing a window is, therefore, important to pay attention also to the value Uw, because that value is closely tied to energy savings: improved thermal insulation means to minimize heat loss and this is a primary goal, especially if you think that in a house about 25% of the heat can be dispersed through the windows.
Each constituent element of the window (profiles, glasses, gaskets) contributes substantially to the overall performance in terms of heat transfer.
Thus a careful choice of materials to use for the construction of windows and a right position and measures of windows can significantly affect the energy balance in order to reduce heating costs.
In any house the link between the presence of CE fixtures and energy saving is direct.
Of all the energy used in a season for heating and conditioning house, in fact, some of it is dispersed by its own structure - roof, walls, windows. One of the ways to save each year fuel is precisely to limit the leakage of hot air through the windows and window frames.
Poor sealing of windows and leaks, in fact, create excessive renewals of air, with relative heat loss; it needs to pay attention also to the roller blind boxes, which represent a point of considerable heat loss, because they are often not isolated.
Therefore, on balance, it is advantageous to install insulated fixtures because with respect to an initial outlay you can save from 20% to 40% since 1 year.