Large trees up to 15 m.
Green roof weight psf.
Intensive green roofs weigh from 35 pounds to beyond 100 pounds per square foot when dry it is all a matter of the soil depth which is affected by the amount of mounding that is used.
Green roof system structure roofs with vegetation blankets consisting of herbs grasses wild flowers or host and nectar plants require a thicker substrate layer than a vegetation blanket consisting of only sedum plants.
Heavier intensive green roofs generally require a concrete supporting deck.
Shrubs up to 3 m.
Weight of roofing materials.
Green roof system weights columbia green technologies 79 se taylor st.
Mid range 5 inch systems weigh approximately 34 pounds per square foot and are compatible with wood or steel decks.
Medium trees up to 10 m.
They support hearty native ground cover that requires little maintenance.
Small trees up to 6 m.
Asphalt shingles 3 tab or strip 1 95 lbs.
Pounds per square foot lb ft 2 pounds per square 100 sq.
Thus the saturated weight of a 3 inch deep system is about 20 pounds per square foot including a mature plant cover.
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.
Weight loading kg m 2 low herbaceous succulents and grasses 10 2.
Green roof vegetation type.
Tray systems are not a viable option for intensive roofs due to the weight.
Extensive green roofs are relatively light at 15 50 pounds 7 23 kilograms per square foot.
When preparing a green roof calculations must always be based on the water saturated weight of the total structure.
Green roof vegetation weight loadings.
The weights of other actual products of the same type may vary.
Ft kilograms per square meter kg m 2 source.
These are the weights of typical actual products.
Green roofs in environmental terms 5 2 benefits in human terms 5 3 green roof technical considerations 5 5 design considerations 5 8 implementation considerations 5 11 maintenence considerations 5 13 6 implementation resources internet resources 6 1 reducing new york city s urban heat island effect ddc 2004 6 5.
