Extensive modular green roofs.
Extensive green roof system weight.
An extensive garden roof assembly can be applied to flat roofs and sloping roofs with a pitch of up to 12 12 or 45 provided the appropriate measures are taken to cope with the shear forces and soil retention.
Selected perennials sedums ornamental grasses herbs and little shrubs.
15 25 lbs ft.
Extensive green roofs sedum roof systems.
O verall depth 3 5 inches.
Sedum roofs with a natural drainage layer are designed to maximize water retention while sedum roofs with a synthetic drainage layer may focus more on minimizing weight.
15 to 50 per square foot.
Extensive green roofs are designed to reap the benefit that green roofs offer at minimal cost and with very little maintenance.
A shallow layer of growing medium supports low growing stress tolerant plants that can generally look after themselves.
The biggest benefit of extensive green roofs is that they need very little maintenance.
For a conventional roof.
Extensive roofs are typically lightweight and can be installed over a variety of structures including metal roof decks.
What contributes to green roof weight.
25 40 lbs ft.
Here s a summary of the different types of green roof available.
Sedum roofs are extensive green roofs that have a media depth of 3 8 inches.
Extensive systems weigh anywhere from 10 to 25 pounds per square foot when dry which is why the interlocking system of trays is important otherwise strong winds could very easily blow the plantings away.
8 to 20 per square foot.
Extensive green roofs are designed to be low maintenance lightweight systems with no general access.
There are two variations for the system build up.
A 2006 study by the university of michigan comparing costs of conventional and green roofs showed that on average installing a green roof costs about 22 00 sq.
Green roof system weights columbia green technologies 79 se taylor st.
Further on the urbanscape green roof system can also be much thinner even more decreasing the weight than traditional green roof system.
Mosses sedums succulents herbs and few grasses.
Typically they have thin layers of substrate the growing medium to keep depth and weight to a minimum.
The two key elements that contribute to weight are the density of the different layers that make up the green roof and how heavy it becomes as a result of rain absorption.
Smaller thickness of the system will not compromise the performance due to the fact that urbanscape green roll can hold up to 3 4 times more water per its volume than other green roof substrates.
Intensive green roofs.
