Here s a guide comparing types.
Sedum roof weight.
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These provide aesthetic interest and diversity.
Sedum roofs with a natural drainage layer are designed to maximize water retention while sedum roofs with a synthetic drainage layer may focus more on minimizing weight.
If necessary this weight can be reduced to approximately 40 kg m for roofs that can only bear a lightweight green roof system.
A variety of hardy sedums both native and non native.
Typically the total depth of the green roof would be 85 100mm 12 20mm drainage layer 70mm of substrate and have a saturated weight of approx.
When using a biodiverse vegetation such as a mix of sedums grasses herbs plants and nectar plants the weight of the green roof is about 150 kilos m2 because a thicker substrate layer is required.
So in dry state 50 m2 traditional green roof weighs around 5 tons while a similar sized urbanscape roof weighs just 1 ton.
Low weight can be crucial for huge building structures and retrofit projects with limited roof loads.
When sedum vegetation is applied to a green roof the weight is approximately 30 kg m2.
Roughly speaking extensive green roofs have a substrate thickness of between 4 and 15 cm and a weight of 30 to 220 kilo per m2.
If necessary this weight can be reduced to approximately 40 kg m for roofs that can only bear a lightweight green roof system.
The thicker the substrate layer the greater the weight of the total roof structure.
When sedum vegetation is applied to a green roof the weight is approximately 30 kg m2.
Extensive built up.
Weight of standard sedum roof.
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.
A standard sedum roof has a saturated weight of about 80 kg m.
Individual complete modules are installed quickly and have a 90 fully grown sedum layer for instant greening.
The weight of a green roof is one of a number of factors specifiers need to consider when deciding which roofing system to use.
In addition the weight also depends on the water buffering capacity of the drainage layer.
A standard sedum roof has a saturated weight of about 80 kg m.
Weight of standard sedum roof.
Plugs or cuttings for plant material weight.
