Gree Roof Live Load

The second trussed roof is designed for a dead load of 160kg m 2 and a live load of 40kg m 2.

Gree roof live load.

The live load on a roof is the weight of any temporary objects on the roof. The dead load of a green roof assembly should be determined on a project specific basis because growth medium composition varies from job to job. Where snow isn t a problem the live load can come from people working on the roof and any equipment they. The entire green roof assembly including plants and the water required to saturate the growth media is considered part of the dead load of the structure.

Developed by fm approvals llc fm standard 4477 is the approval standard for vegetative roof systems. It evaluates green roof performance related to fire foot traffic resistance and water leakage. One cubic foot of dry agricultural dirt or loam typically used for a green roof weighs between 75 and 81 pounds. Arch 331 note set 13 1 s2014abn 2.

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. In july 2011 the liveroof hybrid green roof system became the first to be fm approved according the fm standard 4477. Saturated with water the weight can increase by as much as 35 to around 100 to 110 pounds per cubic foot. Astm e2397 is the established standard procedure for determining the dead and live loads associated with green roof systems.

Where uniform roof live loads are reduced to less than 20 psf 0 96 kn m 2 in accordance with section 1607 13 2 1 and are applied to the design of structural members arranged so as to create continuity the reduced roof live load shall be applied to adjacent spans or to alternate spans whichever produces the most unfavorable load effect see section 1607 13 2 for reductions in minimum roof. Structural loads weight of green rooftops. An analysis of tree loading sloped roofs seismic anchorage of green roofs and recommended structural design specifications and strategies will also be presented. Live loads seismic loads wind effects load combinations serviceability concerns and astm standards is provided.