Green Roof Dead Loads

Soil does not necessarily occupy the full depth of the assembly.

Green roof dead loads.

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. The long term performance of green roofs depends on many factors. 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. Green roofs typically use lightweight engineered soils with very light drainage and insulation layers.

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. For a modest building using 2500 sq ft. Of living roof construction this could translate to 175 000 pounds of dead load on the roof top.

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. We can provide more information on individual products or systems on request. Astm e2397 is the established standard procedure for determining the dead and live loads associated with green roof systems. The values for dead loads in table 3 2 are for commonly used materials and constructions in light frame residential buildings.

On the pages below we show a summary of our product range. 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. 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. Green roof shall provide suitable drainage and water retention capacity to support healthy vegetation cover according to specified vegetation performance.

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.