Weight of standard sedum roof.
Sedum roof weight.
Low weight can be crucial for huge building structures and retrofit projects with limited roof loads.
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.
Here s a guide comparing types.
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.
When sedum vegetation is applied to a green roof the weight is approximately 30 kg m2.
The thicker the substrate layer the greater the weight of the total roof structure.
So in dry state 50 m2 traditional green roof weighs around 5 tons while a similar sized urbanscape roof weighs just 1 ton.
Plugs or cuttings for plant material weight.
If necessary this weight can be reduced to approximately 40 kg m for roofs that can only bear a lightweight green roof system.
These provide aesthetic interest and diversity.
You can watch a video about liveroof here.
A variety of hardy sedums both native and non native.
A standard sedum roof has a saturated weight of about 80 kg m.
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 sedum vegetation is applied to a green roof the weight is approximately 30 kg m2.
A standard sedum roof has a saturated weight of about 80 kg m.
If necessary this weight can be reduced to approximately 40 kg m for roofs that can only bear a lightweight green roof system.
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.
Weight of standard sedum roof.
The thicker the substrate layer the greater the weight of the total roof structure.
In addition the weight also depends on the water buffering capacity of the drainage layer.
Add 2 5 lbs ft2 for sedum mats and tiles system depth dry weight saturated weight 5 25 media depth 17 22 lbs ft2 29 34 lbs ft2 6 media depth 19 25 lbs ft2 33 39 lbs ft2.
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.
