Weights of green roofs

Brooklyn NY brownstones are not built to carry heavy loads on their roofs. So when you install a green roof you need to build for it and know what the weights are.

Here are the numbers from my friend Avra:

Extensive – 10-50 lb/squ. ft
Semi-intensive 30-90lb/sq. ft.
Intensive 80-150 lb/sq. ft.

Here are thicknesses for each:
extensive – 6″ or less
semi intensive – 25% above or below 6″
intensive – more than 6″

About the author: Gennaro Brooks-Church

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