Green Roof Dead Loads

3 3 dead loads dead loads consist of the permanent construction material loads comprising the roof floor wall and foundation systems including claddings finishes and fixed equipment.

Green roof dead loads.

Roof shall balance drainage and water retention to meet drainage requirements but retain as much rain as possible while still meeting drainage and maximum wet weight dead load requirements. 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. Green roofs typically use lightweight engineered soils with very light drainage and insulation layers. Add a conservative snow load allowance for flat roofs of 15 p s f and the design criteria can easily exceed 70 p s f.

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. For a modest building using 2500 sq ft. Arch 331 note set 13 1 s2014abn 2. The long term performance of green roofs depends on many factors.

Astm e2397 is the established standard procedure for determining the dead and live loads associated with green roof systems. Soil does not necessarily occupy the full depth of the assembly. The second most common conservative assumption found in the industry is to assume that the green roof is a soil load rather than a dead load. On the pages below we show a summary of our product range.

Of living roof construction this could translate to 175 000 pounds of dead load on the roof top. We can provide more information on individual products or systems on request. The second trussed roof is designed for a dead load of 160kg m 2 and a live load of 40kg m 2. The use of reliable and established products that comply with green roofing guidelines is important.

The dead load on a roof is the weight of the roof structure itself along with any permanently attached materials or structures on the roof so it must be designed first of all to.