The advantages of roof ventilation in the following conditions:
SUMMER
• Rapid heat loss
• Prevents the heat from moving into the building
• Protects the wooden structural components of the roof
NON-VENTILATED ROOF
VENTILATED ROOF
When heated by the sun, the roof transmits heat to the insulating material, which is a heat retarder. The heat is then transferred to the structural components of the roof, and into the building.
The fresh air that comes from the eaves is heated inside the ventilation space by the sun. As a consequence it becomes lighter and escapes from the ridge of the roof, thus cooling the roofing material.
The advantages of roof ventilation in the following conditions:
NON-VENTILATED ROOF
As a consequence of low temperature, humidity can condensate in the structure of the roof, with harmful effects, such as mould, humidity and dripping.
VENTILATED ROOF
During the winter, air can circulate, so that the insulating material remains dry and condensation is prevented. This in turn extends the life of the roofing system.
The advantages of roof ventilation in the following conditions:
Snow
• Prevents ice-backups on the eaves
• Prevents water backflows
NON-VENTILATED ROOF
VENTILATED ROOF
In mountain areas, dangerous ice-backups are often observed on the eaves of the roofs, which are caused by infiltrations in the roof structure.
Ventilation enables the snow that has accumulated on the roof to melt uniformly, thus preventing the formation of ice-backups
COMPARED THERMAL ANALYSES
The ventilated roof is the most advanced roof construction technique that features a thermal insulation. The thermal results guaranteed by roof ventilation are explained by the results of the tests that have been carried out on two roof types (roof with a concrete structure and roof with a wooden structure). Ventilated roofs are compliant with Italian D. Lgs. 192/05 on the need to reduce air-conditioning energy consumption and the internal temperature of buildings.
CONCRETE ROOFS|
NON-VENTILATED ROOF
VENTILATED ROOF
THERMAL RESULT
THERMAL RESULT
•Temperature of the plastering after a 10-hour exposure = + 34.5°C
• Kcal absorbed : 450 per sq.m. of roof
• Temperature of the matchboards after a 10-hour exposure = + 27.5°C
• Kcal absorbed : 100 per sq.m. of roof
WOODEN ROOFS
TEST ENVIRONMENT CONDITIONS
• Roofing temperature : + 80°C
• Air temperature: + 25°C
• 10-hour exposure. Any heat loss in the area below is not considered
• The same insulating material, of the same thickness, has been used in all tests
NON-VENTILATED ROOF
VENTILATED ROOF
THERMAL RESULT
THERMAL RESULT
•Temperature of the matchboards after a 10-hour exposure = + 42.1°C
•Kcal absorbed : 275 per sq.m. of roof
• Temperature of the matchboards after a 10-hour exposure = + 31.2°C
• Kcal absorbed : 100 per sq.m. of roof
