Gree Roof Live Load

One cubic foot of dry agricultural dirt or loam typically used for a green roof weighs between 75 and 81 pounds.

Gree roof live load.

The live load on a roof is the weight of any temporary objects on the roof. Lastly strategies utilizing green roofs within the context of the. An analysis of tree loading sloped roofs seismic anchorage of green roofs and recommended structural design specifications and strategies will also be presented. Developed by fm approvals llc fm standard 4477 is the approval standard for vegetative roof systems.

Astm e2397 is the established standard procedure for determining the dead and live loads associated with green roof systems. The second trussed roof is designed for a dead load of 160kg m 2 and a live load of 40kg m 2. Structural loads weight of green rooftops. It evaluates green roof performance related to fire foot traffic resistance and water leakage.

Building codes may vary so it is important to determine the local requirement for live loads and dead loads and to understand how the green roof being built relates to weight requirement. In july 2011 the liveroof hybrid green roof system became the first to be fm approved according the fm standard 4477. D dead load l live load l r live roof load w wind load s snow load e earthquake load r rainwater load or ice water load t effect of material temperature h hydraulic loads from soil f hydraulic loads from fluids. 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.

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. 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. Live loads seismic loads wind effects load combinations serviceability concerns and astm standards is provided. 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.