Latest generation ventilated roof
The Tegola Canadese “ventilated roof” strives for perfection, becoming at the same time simpler and also better performing.
The IWIS Group, manufacturer of TEGOTHERM insulating boards, has created a new type of insulating board, featuring the “TV” acronym, conceived for the installation of the Tegola Canadese ventilated roof: the AVF TV and XPS TV boards create a first necessary housing for the first row of battens, which lean directly on the insulating material.
The boards are available in two 100 mm thick versions:
– XPS TV in extruded polystyrene with λD=0.036 W/mk
– AVF TV in polyiso (PIR) and gas-proof A-Cell® facer with λD=0.023 W/mk
Characteristics of the AVF TV and XPS TV ventilated roof system
Ventilated roof layers using XPS TV
Sizes 1200 x 600 mm
Thickness 100 – 140 mm
ɅD= 0,036 W/mK – 0,038 W/mK
Ventilated roof layers using AVF TV
Sizes 1200 x 1200 mm
Thickness 100 mm
ɅD= 0,023 W/mK
Gas-proof A-Cell® facer
Thermal performance and construction technology
The ventilated roof built using AVF TV and XPS TV boards meets the thermal transmittance limits set by Italian Legislative Decree 311/06 and subsequent amendments and integrations, for all the Italian climate zones and for the months of maximum summer sun. In Italian locations with irradiance exceeding 290 W/m², and in general in roof with a surface mass below 200 kg/m², the AVF TV board reaches and meets the thermal performance set by Art.2 of Italian Presidential Decree 59/09, meaning a periodical thermal transmittance YIE lower than 0.20 W/m²K
The worldwide attention for the protection of the environment has made energy savings in buildings a main factor, resulting in the promotion of environmentally friendly solutions. This has in turn brought to the development of technologies aimed at keeping constant temperatures inside buildings, with limited energy usage. The “ventilated roof” technology, which together with insulation is the most important passive solution for temperature and humidity comfort inside buildings, is aimed at keeping constant indoor temperature with limited energy consumption, whilst also increasing the useful life of the roof structures, by protecting them from humidity and mould.
The ventilated roof can be considered such when the outer covering is detached from the insulating layer (or the installation structure/laying surface, should no insulation layer be present), creating a gap where an upward air flow develops. When heating, due to conduction/convection caused by the heating of the covering exposed to the sun, the air increases in volume and decreases in weight, travelling to the top of the roof and then escaping from the roof ridge, therefore causing the suction of fresh air from the gutter. This gradually removes the heat that develops on the roof covering, preventing it from travelling through the building. In winter, air circulation will always keep the insulation well ventilated, and therefore dry, avoiding the formation of inner condensation and preserving its insulating performance, in addition to the quality and functionality of the roof structures.
Comparison tests and the advantages of ventilation
Below are some tests and their results, which give an objective view of the advantages, based on the type of roof structure, which of course has a significant impact.
Presumed environmental conditions:
- ambient air temperature +25°C;
- roof covering temperature +80°C;
- roof covering temperature +80°C;
- lack of wind;
- same insulating material of same thickness for all the tests.
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