Green Roof Saturated Weight

Holds up to 9 litres of water per square metre so saturated weight is 9kg m2.

Green roof saturated weight.

Cuttings for plant material weight. Fill a cup with green roof growing media lightly compressing it simulating installed conditions. The green roof solution uses a unique lightweight growing media rather than soil and as a result is less than 8 cm thick and six times lighter than traditional systems weighing only 20 kg m2 dry or 65 kg m2 saturated. 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. Lightest weight system at just 44kg m saturated weight loading installed directly onto the root resistant waterproofing complete integrated system 11 species of sedum are grown in the blanket to ensure plant diversity. The second trussed roof is designed for a dead load of 160kg m 2 and a live load of 40kg m 2. 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.

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. Layered system extensive growing media. A flat roof built using the enviromat green roof system will weigh the following. 4 625 media depth 15 20 lbs ft2 25 30 lbs ft2.

You may have to allow this to percolate into all of the voids. Think about the saturated weight this way. Weight vegetative roof weights can range from 16 to 60 pounds per square foot depending on the depth of the growth medium types of plantings and accumulated weight of other additions such as pavers or water features. 8 media depth 25 33 lbs ft2 44 52 lbs ft2.

When saturated with water in the summertime when the plants are at their biggest and heaviest the mats weigh 40 45kg m2. System depth dry weight saturated weight. That is your starting point. Weight of standard sedum roof a standard sedum roof has a saturated weight of about 80 kg m.

Pre grown trays extensive 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. Photo by andrew wutke.