Green Roof Weight Psf

Tray systems are not a viable option for intensive roofs due to the weight.

Green roof weight psf.

Small trees up to 6 m. Asphalt shingles 3 tab or strip 1 95 lbs. Perennials and low shrubs up to 1 5 m. Green roof vegetation type.

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. When preparing a green roof calculations must always be based on the water saturated weight of the total structure. Green roof vegetation weight loadings. Weight loading kg m 2 low herbaceous succulents and grasses 10 2.

Shrubs up to 3 m. 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. Heavier intensive green roofs generally require a concrete supporting deck. Extensive green roofs are relatively light at 15 50 pounds 7 23 kilograms per square foot.

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 weights of other actual products of the same type may vary. They support hearty native ground cover that requires little maintenance. 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.

These are the weights of typical actual products. Ft kilograms per square meter kg m 2 source. Thus the saturated weight of a 3 inch deep system is about 20 pounds per square foot including a mature plant cover. Large trees up to 15 m.

Medium trees up to 10 m. Therefor a significant amount of attention must be paid to the various. Mid range 5 inch systems weigh approximately 34 pounds per square foot and are compatible with wood or steel decks. Weight of roofing materials.