Green roof systems are generally
divided into two categories: extensive and intensive. Extensive system:
which is characterized by shallow soils typically 3- to 6-inches deep.
The weight of an extensive system with saturated soils is not much
heavier than that of conventional rooftop ballast applications, making
additional structural support systems unnecessary.
Intensive green roof soils are deeper
than 6 inches, allowing for larger plants. The additional soil produces
a heavier roof load, which often requires additional structural support.
Benefits:
The green roof’s soil layer has a sponge-like quality. It will hold a
significant quantity of water, as well as releasing water that it can’t
hold more slowly than a conventional roof. The slower release smoothes
out or attenuates peak storm water rates. Evaporation from the soil
surface and transpiration by the plants will further reduce the total
volume of water that flows from the roof. The green roof also provides
benefit in energy savings.
Thermal insulation provided by the
soil layer slows heat transfer to the structure in the summer and
reduces heat loss in the winter.
Life-cycle analysis suggests that the
waterproofing for a green roof will last longer than that of a
conventional roof. By protecting the waterproofing from ultraviolet
degradation, mechanical puncture and temperature extremes, green roofs
are less susceptible to heat damage and cracking.
·
Stick Building Systems:
Is an old system of building a house,
using wood studs. New composite wood studs are now being used in place
of wood studs. However the method is still the same.
·
Pre-fabricated Building
Systems:
Typically Steel or insulated panel
system pre-engineered. Pre-fab systems are usually quicker and easier to
install.
