Green Roof Live Loads

Structural loads weight of green rooftops.

Green roof live loads.

Astm e2397 is the established standard procedure for determining the dead and live loads associated with green roof systems. What is the impact of green roof weight on building structure. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of. Arch 331 note set 13 1 s2014abn 2.

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. Saturated with water the weight can increase by as much as 35 to around 100 to 110 pounds per cubic foot. Live loads seismic loads wind effects load combinations serviceability concerns and astm standards is provided. Lastly strategies utilizing green roofs within the context of the.

Where snow isn t a problem the live load can come from people working on the roof and any equipment they. The live load on a roof is the weight of any temporary objects on the roof. An analysis of tree loading sloped roofs seismic anchorage of green roofs and recommended structural design specifications and strategies will also be presented. In older buildings or new build this may require costly structural reinforcement which in some cases may prove prohibitively expensive.

One cubic foot of dry agricultural dirt or loam typically used for a green roof weighs between 75 and 81 pounds. 2attic loads may be included in the floor live load but a 10 psf attic load is typically used only to size ceiling joists adequately for access purposes. The second trussed roof is designed for a dead load of 160kg m 2 and a live load of 40kg m 2. 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.

A traditional green roof can exert a load of up to 250 kg per m2 and that inevitably means a strong building is required to support the weight.