White is more reflective and a good deal cheaper than a greenroof but the age-old time-tested practice of a turf roof is being heralded as the best possible method of mediating temperature --- cool in the summer, warm in the winter, wth the additional benefits of reducing run-off, cleaning the air & creating oxygen.
Well its always a great idea but the increase of construction cost "structural" I mean its just not grass , there is the sod , base soils and not to mention the weight of water from watering the grass and you still need to have a roof or some kind of water proofing
Imagine if you will; Water proofing + 4 inches of base soil for drainage + 6 inches of top soil + 2 inches of sod + when soaked with water you need a structure to carry all that weight + then add the additional weekly maintenance of fertilizers and someone has to MOW the lawn which would add more CO2's . So you save on a few things but you end up adding to others . Not really feasible.
Now Japan has the right idea;
Their high rises apartment buildings have been opening up their roof tops . Tenants can lease out portions of the roofs to build green houses which they grow fruits , veggies and flowers either for them selves or commercially - Its a freaking win win . The building makes a little extra cash from the leasing and cools down the roof for greater A/C efficiency . The tenants either saves money from buying produce or makes some extra cash from selling produce . The environment wins from the heat blow back that would normally happen without the green houses <-- now thats a great idea -- > Sadly in the US no one is permitted on the roofs unless your a maintenance guy or contractor .
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