For more in depth information the astm standards e2397 and e2399 has published specific protocols for determining the weight and dead load of green roofs.
Green roof blocks weight.
75 drainage layer 5 water retention layer includes 2 lbs s f.
A standard sedum roof has a saturated weight of about 80 kg m.
In addition the weight also depends on the water buffering capacity of the drainage layer.
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.
Layered system semi intensive growing media.
If necessary this weight can be reduced to approximately 40 kg m for roofs that can only bear a lightweight green roof system.
5 media depth 17 22lbs ft2 31 37 lbs ft2.
So in dry state 50 m2 traditional green roof weighs around 5 tons while a similar sized urbanscape roof weighs just 1 ton.
The green roof blocks can be used as ballast in the same manner as paver blocks.
Green roof blocks manufactures roof garden modules and paks providing simple solutions for green roof read more.
Green roof blocks conducts exten sive growth media evaluation allowing us to regionally locate nec essary materials for a more envi ronmentally responsible approach to green roofs.
Our blended growth media formulation has a weight rangingfrom i i pounds per square foot dry to 17 pounds per square foot when saturated.
Plant material weight plugs or small containers system depth dry weight saturated weight.
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.
The weight of the system is 12 to 18 pounds per square foot the weight required to ballast single ply roofing membrane.
Photo by andrew wutke.
The venny green roof melbourne.
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.
Scale this up and a 1 000 m2 traditional green roof space requires 100 tons of material to be brought on the roof and the urbanscape version only 20 tons and can be called a light weight green roof.
Heavier intensive green roofs generally require a concrete supporting deck.
The second trussed roof is designed for a dead load of 160kg m 2 and a live load of 40kg m 2.
Mid range 5 inch systems weigh approximately 34 pounds per square foot and are compatible with wood or steel decks.
Dry weight 11 pounds per sq ft saturated weight 17 pounds per sq ft water retention 6 pounds per sq ft planter dimensions 24 x 24 x 4 deep planter material 8mm anodized aluminum walk pad dimensions 3 x 3 5 walk pads 1 at each corner and 1 in center walk pad manufacturer to match roofing system.
