Green Roof Dead Load Psf

Maximum system dead load of psf determined according to astm e 2397 05 and e 2399 05.

Green roof dead load psf.

Vegetated roofs shall retain a minimum of x c f. Minimum system dead load of psf pounds per square foot determined according to astm e 2397 05 and e 2399 05. Factors that influence. Many factors influence how a system responds to loading.

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. 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. Af pa s appendix a lists a variety of live and dead load combinations for floors ceilings and rafters.

The second trussed roof is designed for a dead load of 160kg m 2 and a live load of 40kg m 2. When the loading for the green roof system was entered into the pcaslab program and applied. Minimum uniformly distributed live loads adapted from sei asce 7 10. 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.

26 psf total live load 30 psf total dead load 56 psf factored loading. 30 psf extensive green roof system. Soil does not necessarily occupy the full depth of the assembly. 0 9d 1 0w a load factor of 1 6 when adding to load 7.

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. 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 values for dead loads in table 3 2 are for commonly used materials and constructions in light frame residential buildings. 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.

Minimum design loads for buildings and other structures location uniform load psf. 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.