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.

Or s or r included with the same load factor as 3. Astm e2397 is the established standard procedure for determining the dead and live loads associated with green roof systems. Green roofs typically use lightweight engineered soils with very light drainage and insulation layers. 1 2d 1 0e l 0 2s when h loads are present they shall have 6.

For a green roof wall or facade the loads that the building structure must support include. 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. The first condition is considered the dead load of the vegetative green roof system. 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 support itself.

The difference in weight between the first and second conditions approximated by the weight of transient water in the drain layer is considered a live load. Saturated with water the weight can increase by as much as 35 to around 100 to 110 pounds per cubic foot. 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. 1 2d 1 6 l r or s or r l or 0 5w dead load d in 1 through 5 and 7.

Soil does not necessarily occupy the full depth of the assembly. 0 9d 1 0e effect or 0 9 when resisting the load when permanent. The values for dead loads in table 3 2 are for commonly used materials and constructions in light frame residential buildings. 0 9d 1 0w a load factor of 1 6 when adding to load 7.

The addition of materials over the roofing waterproofing membrane system associated with vegetative roof systems usually increases the dead load in varying amounts based on the number composition and thickness of the layers. 1 2d 1 0w l 0 5 l r or s or r 5. 1 4 this practice does not address point or line loads associated with architectural elements that are not essential components of a particular vegetative green roof system.