Green Roof Weight Psf

Green roof system weights columbia green technologies 79 se taylor st.

Green roof weight psf.

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. Weight 1 9 2 6 gal sq h2o ret. Pounds per square foot lb ft 2 pounds per square 100 sq. These are the weights of typical actual products.

When weight is good by chris wark energy editor originally posted september 21 2010. The type of green roof in question is engineered to be light and doesn t have typical soil with plants see link above. Weight of roofing materials. When preparing a green roof calculations must always be based on the water saturated weight of the total structure.

Intensive green roofs are essentially roof gardens and may also need to allow for the additional weight of paving and terracing furniture and even trees. The second trussed roof is designed for a dead load of 160kg m 2 and a live load of 40kg m 2. Asphalt shingles 3 tab or strip 1 95 lbs. Green roof energy series part 4.

The weight of a green roof can sometimes present a structural challenge but for controlling the flow of heat energy that weight is a big benefit. Layered green roof systems. Tray systems are not a viable option for intensive roofs due to the weight. The weights of other actual products of the same type may vary.

The company s website lists weights from about 18 psf to a little over 45 50 psf or so. 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. 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. An interesting example of an intensive green roof is manaton the award winning private house on dartmoor that uses local meadow grass to blend the family home into the landscape.

Therefor a significant amount of attention must be paid to the various waterproofing and root barrier details. 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.