Types outer insulation in the building: coat, warm roofs, inverted roofs

The technique of the outer insulation to reduce the amount of heat exchanged with the outside of the building, the building consists in winding completely into the insulation. In this way, unlike what happens in the case of internal isolation, is not reduced the internal surface of the building. External insulation for the vertical walls, it is said insulation. When it is applied to covers, roofs distinguish hot showers and depending on that the waterproofing is located above and below or just below the insulation.

THE VERTICAL WALLS

The technique used to coat exterior insulation:

To achieve a thermal insulation, you must follow the following steps:

- Clean the external surfaces;

- Apply the insulation. The insulator can be constituted by a panel (to be glued or mechanically fixed to the support with the dowels) or from mortars based on polystyrene, hydraulic binders and additives which allow to reach thicknesses greater than 5 cm;

- Forming a surface layer of plaster (shaving + + network port plaster finish.) The final appearance will be similar to that of a common wall facade.

COVERAGE

The hot roof

The hot roof is made with a double waterproofing: one placed below and the other above the insulating material. The first has the function of the vapor barrier, the second serves to protect the insulation from the water. In warm roofs, it happens that the high temperature variations between the outer layer and the inner one, cause thermal expansion, because, in the long term, cracks in the waterproof membrane.

The inverted roof

To overcome the above drawback, are preferred inverted roofs characterized by insulating water-resistant to mechanical stress and resting directly on the waterproofing of the cover that, in this way, is not subject to excessive thermal excursions.

PROS AND CONS

After explaining the techniques with which to make an outer insulation, let's take the advantages and disadvantages.

Positive in this system, there is a lot. Suffice to say that it is able to eliminate the effects of thermal bridges and reduce the risk of surface condensation, which occurs because of temperature changes inside the masonry that the insulation reduces. Being outside the building, then, means that the walls are maintained warm in winter and cool in summer ensuring thermal comfort system is switched off for a long period (high thermal inertia). It is not to overlook the fact that an intervention of external insulation on existing buildings not limit the usable inner surface and, on new buildings, in some cases it is economically convenient than traditional tompagnature although it may still be considered the most expensive among the traditional systems of isolation.

The disadvantages of the system to coat only occur in case of existing buildings, for which the intervention requires the installation of scaffolding and is not always possible to do because it determines an increase of volume is not always achievable.

 

10/12/2009

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Translated via software

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Source:

Italian version of ReteArchitetti.it