Green Roof Live Loads

Lastly strategies utilizing green roofs within the context of the.

Green roof live loads. In older buildings or new build this may require costly structural reinforcement which in some cases may prove prohibitively expensive. An analysis of tree loading sloped roofs seismic anchorage of green roofs and recommended structural design specifications and strategies will also be presented. Astm e2397 is the established standard procedure for determining the dead and live loads associated with green roof systems. Structural loads weight of green rooftops.

Saturated with water the weight can increase by as much as 35 to around 100 to 110 pounds per cubic foot. Where snow isn t a problem the live load can come from people working on the roof and any equipment they. Arch 331 note set 13 1 s2014abn 2. 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.

What is the impact of green roof weight on building structure. One cubic foot of dry agricultural dirt or loam typically used for a green roof weighs between 75 and 81 pounds. 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. 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.

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. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of. The live load on a roof is the weight of any temporary objects on the roof. The second trussed roof is designed for a dead load of 160kg m 2 and a live load of 40kg m 2.

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.