Heavier intensive green roofs generally require a concrete supporting deck.
Green roof weight psf.
Mid range 5 inch systems weigh approximately 34 pounds per square foot and are compatible with wood or steel decks.
Green roof vegetation weight loadings.
The weights of other actual products of the same type may vary.
Asphalt shingles 3 tab or strip 1 95 lbs.
When preparing a green roof calculations must always be based on the water saturated weight of the total structure.
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.
They support hearty native ground cover that requires little maintenance.
Green roof vegetation type.
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.
Therefor a significant amount of attention must be paid to the various.
Weight loading kg m 2 low herbaceous succulents and grasses 10 2.
Perennials and low shrubs up to 1 5 m.
Pounds per square foot lb ft 2 pounds per square 100 sq.
Shrubs up to 3 m.
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.
Ft kilograms per square meter kg m 2 source.
These are the weights of typical actual products.
Large trees up to 15 m.
Tray systems are not a viable option for intensive roofs due to the weight.
The foot or more of growing medium needed for an intensive green roof creates a load of 80 150 pounds 36 68 kilograms per square foot.
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.
Small trees up to 6 m.
Green roof system weights columbia green technologies 79 se taylor st.
Weight of roofing materials.
