For a conventional roof.
Green roof self weight.
40mm high perforated edge drainage trim for bauder sedum blanket.
Medium trees up to 10 m.
Small trees up to 6 m.
Weight of roofing materials.
Last updated july 22 2020.
2 al40 edge trim frames and retains the xf301 system.
The following table provides typical weights dead load self weight for various roofing materials.
None asphalt roll roofing 1 1 lb m ft 2 5 4 kg m 2 asphalt shingle or asphalt fiberglass composite shingle 2 7 lb m ft 2 13 2 kg m 2.
The green roof concept has seen wide spread acceptance within the construction community.
Shrubs up to 3 m.
Large trees up to 15 m.
15 to 50 per square foot.
You can retrofit a green roof but in these cases you may need to use a much lighter weight green roof system a sedum layer with a light soil is a good solution.
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.
Perennials and low shrubs up to 1 5 m.
Sedum vegetation blanket instantly providing at least 90 coverage on an extensive green roof.
1 xf301 sedum blanket system with integrated water retention and filter layer.
Where possible the values were taken directly from manufacturer technical data sheets and are the actual weights of specific representative products.
Green roof vegetation type.
The weight of roofing constructions above the truss rafter may be estimated with the calculator below.
The result is a cooler roof decreasing the buildings energy consumption and reducing the heat island effect.
A 2006 study by the university of michigan comparing costs of conventional and green roofs showed that on average installing a green roof costs about 22 00 sq.
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.
Green roof vegetation weight loadings.
0 80 mm steel sheet.
Weight loading kg m 2 low herbaceous succulents and grasses 10 2.
Green roofs can help reduce energy costs for a building by acting as another layer of insulation between the inside and outside of the roof.
The main thing is to speak to a structural engineer to know if the roof can support the weight of the green layer because once it s absorbed rainwater it can get very heavy.
