When preparing a green roof calculations must always be based on the water saturated weight of the total structure.
How much does a green roof weigh.
Mid range 5 inch systems weigh approximately 34 pounds per square foot and are compatible with wood or steel decks.
The weight of a green roof will depend on the total structure of the green roof system.
As a guide prices can vary from 50 m for a sedum roof to 200 m for a fully planted intensive roof the cost of any reinforcement needed to the roof and or wall structures is additional to this.
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.
For more in depth information the astm standards e2397 and e2399 has published specific protocols for determining the weight and dead load of green.
The cost will vary with the green roof system and the particular situation.
How much does a green roof weigh.
The weight of biodiverse green roofs varies according to the needs of the plant species required.
Weight is negligible water retention mat.
Heavier intensive green roofs generally require a concrete supporting deck.
A traditional green roof with soil substrates are usually designed with plugs cuttings or seeds which consequently require much care and attention in first years to reach good green coverage and diverse vegetation.
Typically a basic lightweight green roof will weigh between 60 to 150 kg per square metre which will increase when saturated with rain or snow.
Biodiverse green roofs are low maintenance roofs designed to create or replace natural habitats.
How much does a green roof weigh.
They can be specified to meet local biodiversity action plans or to support specific flora and fauna including bats bees butterflies birds and so on.
Check that there are no areas of damp rotting wood.
Holds up to 9 litres of water per square metre so saturated weight is 9kg m2.
A flat roof built using the enviromat green roof system will weigh the following.
How does weight impact on initial maintenance.
The soil depth of an intensive green roof typically ranges from 12 36 in.
This increases dramatically the cost in comparison to prevegetated green roofs.
An intensive green roof is the most expensive but also has the highest capability to mitigate stormwater runoff and insulate a building.
Naturally if building owners introduce plants grass.
The weight of a green roof depends on the materials used and type of system installed.
