The addition of materials over the roofing waterproofing membrane system.
Live loads of a sedum roof.
This lightness means most buildings have a comfortable load bearing capacity that is sufficient and architects can even plan green roofs where it had not been possible before such as on lightweight metal constructions.
The venny green roof has shallow substrates on two types of roof the first roof is on shipping containers and is designed for a dead load of 250kg m 2 and live load of 100kg m 2.
It has areas of deep and shallow substrate and is designed for a dead load of 300kg m 2 and a live load of 300kg m 2 on the decking and walkway mesh areas and 150kg m 2 on the planting area.
This issue of live load vs.
Ground snow load might seem somewhat confusing until you read the basic premise that is identified in irc section r301 6 which states.
Victor staley a building official in the town of brewster mass responds.
An extensive green roof or sedum roof is a roof with vegetation that is more or less self perpetuating and that can further develop and maintain itself.
As mentioned sedum vegetated green roof designed by urbanscape is six times lighter than traditional green roof systems.
The live load on a roof is the weight of any temporary objects on the roof.
Roughly speaking extensive green roofs have a substrate thickness of between 4 and 15 cm and a weight of 30 to 220 kilo per m2.