In roofing the finish covering is often laid directly on the thermal insulation layer. The high temperatures reached in the summer in service conditions can alter and soften the insulation materials,which lose their dimensional stability (over 85°C). Ventilated roofs prevent overheating. This system allows for the circulation of air between the thermal insulation layer and the covering layer. The air flows from the eaves to the ridge by natural convection (vents can be added to increase the flow) and eliminates the heat in excess and the water vapor from inside the building. This continuous flow of dry dries any rainwater seeping into the layer below the tiles. Ventilation is normally achieved by applying a double layer of wood strips on which the tiles are then laid. However, the same results can be obtained thanks to specifically designed panels, such as ALGOPAN VENTILATO USD – a prefabricated ventilated panel with air chamber made of X-FOAM^® extruded polystyrene. The gap inside the panel ensures ventilation and, once the panels are laid and fit together, the extrados surface in OSB creates a treadable roof boarding that makes the subsequent layingof tiles, convex tiles and other external finished extremely easy.

Laying
The level and clean surface in tiles covered by cement is to be coated with a layer of waterproofing membrane to ensure water tightness and act as a vapor barrier. The panels are applied on the membrane. If it is necessary to glue the panels to the membrane with polyurethane adhesives, such as, for instance, BOMBOFIX, or mechanical fastening devices. The panels are fit together making sure that the first are laid well on the eaves side. Then proceed up to the roof's ridge. An appropriate bird screen system is to be mounted along the eaves. As for the lateral finishing in the areas where there is a change in gradient or on the ridge, the panels are cut or shaped making sure that, if the OSB support strips are eliminated, an alternative support is provided by fitting pieces of extruded polystyrene or wood of the right height (4 cm).  La superficie all’estradosso dei pannelli, costituita The roof boarding consisting of the panels is the laying bed for the strips on which the convex tiles or tiles are applied or for the final coating. Once you reach the ridge, make sure not to fill the vents with mortar or cement, as it risks reducing the effectiveness of the ventilation.

Advantages
Excellent thermal insulation thanks to the use of X-FOAM^® extruded polystyrene.
Ideal laying surface for cement, clay or bituminous convex or standard tiles.
Easy-to-lay, lightweight and sturdy modular system; the panels can be shaped and worked using normal tools.
It can be pasted with adhesives not containing solvents.
It is durable and maintains its characteristics over time.