Green Roof Weight Psf

Pounds per square foot lb ft 2 pounds per square 100 sq.

Green roof weight 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. Weight of roofing materials. Medium trees up to 10 m. Ft kilograms per square meter kg m 2 source.

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 vegetation type. 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. Perennials and low shrubs up to 1 5 m.

Shrubs up to 3 m. Small trees up to 6 m. When preparing a green roof calculations must always be based on the water saturated weight of the total structure. Mid range 5 inch systems weigh approximately 34 pounds per square foot and are compatible with wood or steel decks.

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. 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. They support hearty native ground cover that requires little maintenance. Green roof vegetation weight loadings.

Green roof system weights columbia green technologies 79 se taylor st. These are the weights of typical actual products. 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.

Therefor a significant amount of attention must be paid to the various. Large trees up to 15 m. The weights of other actual products of the same type may vary. Heavier intensive green roofs generally require a concrete supporting deck.