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The formation of a gap in coverage ventilation improves the heat and humidity of the environment below

One of the problems face when you want to transform an existing attic into a habitable building, and 'welfare to ensure an adequate temperature, humidity, preventing condensation in winter and excessive heat in summer.

This is an issue that often faces in the building because many regional regulations allow the transformation of existing roofs in local civilian housing.

A possible solution may be represented by the construction of a ventilated roof. In fact, according to UNI 9460, the formation of a cavity ventilation should be mandatory in the construction of any pitched roof with wooden or concrete reinforced to ensure the appropriate temperature and humidity characteristics.

To ensure proper roof insulation is essential therefore the presence of an air ventilation of a uniform thickness throughout the flap, which allows to improve the performance of any layer of insulating material , thereby saving about 40% of the energy needed.

The creation of a roof ventilation is not particularly complex: it is not necessary to rebuild the whole structure but only one is sufficient rifarne part.

To achieve this type of structure overlapping layers of different materials. Beginning at the bottom layers consist of:

- structure;

- vapor barrier;

- insulating panel;

- sheath of air tightness and water;

- roofing.

between it and the sheath should be localized layer of ventilation, however, always placed between the thermal insulation and sealing layer.

There are several construction techniques, but the more traditional one involves the coupling of sealing elements such as shingles, tiles or tiles, for un'orditura perforated to ensure adequate ventilation under the tiles.

The presence of an air cavity facilitate the improvement of internal conditions because, in the summer, the motions convettivicondensa and can cause damage to the insulating layer and structures. forming, prevent the formation of the hood of heat generated under the roof covering, while in winter prevent the accumulation of moisture that is generated over time

In summer the air in 'cavity warms due to solar radiation. The temperature difference creates air currents that bring warm air to escape from the ridge, while the cooler enters through the eave vents. This movement reduces the heat produced by the tiles on the environment below, the effect of ventilation and because they are not in direct contact with insulation.

This effect is important, if we consider that, in summer, the tiles can reach a surface temperature of 70 ° - 80 ° C.

In winter, the temperature difference between inside and outside in the formation of water vapor tends to escape through the building envelope, determining the effect of the presence of condensing layers of insulation. In this case the presence of an airy encourages the disposal of water vapor and better distribution of internal heat.

interspace thickness depends on the technical characteristics of the roof, as the type of coverage, length and slope of the aquifer, but also the weather conditions of the site. It must not have cross battens or other elements that may limit the upward flow of hot air.

The realization of air vents at the ridge of the roof involves the interruption of coverage and can cause water infiltration that can cause damage to the insulating layer of the structure.

To prevent this infiltration the vents must be aligned with the ridge, then placed in the areas of the roof where the air flow is always directed from the inside out.

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arch. Carmen Granata

source: Lavorincasa