Mosses sedums succulents herbs and few grasses.
Extensive green roof system weight.
25 40 lbs ft.
Typically they have thin layers of substrate the growing medium to keep depth and weight to a minimum.
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.
Extensive green roofs are designed to be low maintenance lightweight systems with no general access.
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.
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 roofs are typically lightweight and can be installed over a variety of structures including metal roof decks.
Sedum roofs are extensive green roofs that have a media depth of 3 8 inches.
Extensive green roofs sedum roof systems.
15 25 lbs ft.
Selected perennials sedums ornamental grasses herbs and little shrubs.
There are two variations for the system build up.
Intensive green roofs.
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.
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.
35 80 lbs ft.
For example a traditional intensive green roof system for plants and grass featuring at least six layers including soil filter fleece drainage layer and vegetation is.
A shallow layer of growing medium supports low growing stress tolerant plants that can generally look after themselves.
15 to 50 per square foot.
What contributes to green roof weight.
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.
Here s a summary of the different types of green roof available.
O verall depth 3 5 inches.
Further on the urbanscape green roof system can also be much thinner even more decreasing the weight than traditional green roof system.
The biggest benefit of extensive green roofs is that they need very little maintenance.
Extensive modular green roofs.
Extensive green roofs are designed to reap the benefit that green roofs offer at minimal cost and with very little maintenance.
