Abstract:
Vegetal roofs imply growing plants on the upper part of the buildings,
thus replacing the surface taken away from nature by building that
construction. Depending on the thickness of the substratum and the irrigation
possibilities, there can be arranged extensive or intensive type plantations.
The advantages of installing a green roof system are multiple, with a
technical impact on the resistance and comfort a roof assures: ultraviolet
rays protection, thermal shocks, thermal and sonic isolation, landscape
impact, impact on health (improves the air quality), increases social and
economical value etc.
The experiments show that an extensive type vegetal roof of 15 cm
height reduces the overheating of the building with 95% and the heat lost
with 26% comparing to a conventional type roof. A green roof acts like a
humongous sponge, diminishing the pressure from the water collecting
points, thus, during the summer, depending on the plants and the thickness of
the growing substratum, vegetal roofs retain 70-90% from the rainfall, and
during winter, 25-40%. It is proven fact that green roof type landscape
arrangements increase a construction’s value, residential or commercial,
with 15-20%
