Minimum system dead load of psf pounds per square foot determined according to astm e 2397 05 and e 2399 05.
Green roof dead load psf.
Factors that influence.
26 psf total live load 30 psf total dead load 56 psf factored loading.
Cubic feet of water as determined according to astm e2397.
0 9d 1 0w a load factor of 1 6 when adding to load 7.
Many factors influence how a system responds to loading.
For example appendix a indicates that one type of clay tile roof system has a live load value of 20 psf and a dead load value of 15 psf.
When the loading for the green roof system was entered into the pcaslab program and applied.
0 9d 1 0e effect or 0 9 when resisting the load when permanent.
Green roofs typically use lightweight engineered soils with very light drainage and insulation layers.
On a roof with a slope greater than 4 to 12 the live load limit is typically adjusted downward from 20 psf to 15 psf to allow for the relatively greater dead load on the steeper roof.
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.
Minimum uniformly distributed live loads adapted from sei asce 7 10.
1 2d 1 0e l 0 2s when h loads are present they shall have 6.
1 2 d 1 6 l 0 5 s 1 2 26 psf 1 6 30 psf 0 5 30 psf 94 2 psf pcaslab.
Vegetated roofs shall retain a minimum of x c f.
30 psf extensive green roof system.
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.
30 psf snow load.
Af pa s appendix a lists a variety of live and dead load combinations for floors ceilings and rafters.
Minimum design loads for buildings and other structures location uniform load psf.
Soil does not necessarily occupy the full depth of the assembly.
Maximum system dead load of psf determined according to astm e 2397 05 and e 2399 05.
