Quick Answer: What is the weight of a sedum roof?

A standard Sedum roof has a saturated weight of about 80 kg/m². If necessary, this weight can be reduced to approximately 40 kg/m² for roofs that can only bear a lightweight green roof system.

How much do green roofs weigh?

When fully saturated and with mature plant cover, a thin extensive green roof can weigh about 13 pounds per square foot. A more typical extensive roof with 3 to 4 inches of growing medium weighs 17 to 18 pounds per square foot, and a deeper intensive system can weigh 35 pounds or more per square foot.

How much additional weight does a green roof add?

A traditional green roof can exert a load of up to 250 kg per m2 and that inevitably means a strong building is required to support the weight. In older buildings or new-build this may require costly structural reinforcement which in some cases may prove prohibitively expensive.

How thick is a sedum roof?

What is a Sedum roof with Sedum mats? An extensive green roof or Sedum roof is a roof with vegetation that is more or less self-perpetuating and that can further develop and maintain itself. 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.

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What are the disadvantages of a green roof?

Disadvantages of green roofs

  • A greater expense than traditional roofs. Unfortunately for green roofs, they do tend to be slightly more expensive than the traditional option. …
  • An increase in weight load. …
  • Require extra maintenance.

How deep is a green roof?

There are two types of green roof: intensive roofs, which are thicker, with a minimum depth of 12.8 cm (51⁄16 in), and can support a wider variety of plants but are heavier and require more maintenance, and extensive roofs, which are shallow, ranging in depth from 2 cm (13⁄16 in) to 12.7 cm (5 in), lighter than …

Do green roofs really work?

Since your roof is covered by plants, the amount of it exposed to the elements is limited, enabling the roof membrane to last much longer than if unprotected. Green roofs reduce the amount of energy your house needs for heating, saving you money. The fire retardation provided by green roofs helps protect your home.

Can I turn my flat roof into a green roof?

Green roofs can be created on flat or pitched roofs. Ideally, a green roof will go on a slope up to 10° but if it’s on a slope over 20°, make sure you have a frame to stop the green roof from slipping. … The frame needs to be the same depth as the substate (soil), normally 100mm minimum.

Can you put a green roof on an existing building?

Extensive green roofs are a popular option for homeowners as they are lightweight and require very little maintenance with no need for additional watering unless there is a prolonged drought. They are suitable for both existing and new build roof decks.

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What is the cost of a green roof?

Green Roofs

A small green roof (30-50 m2) with reasonable access would cost between $150 and $400 per square metre to install.

How much does a sedum roof cost?

Cost of Installation

At the time of writing, (January 2017) the materials for a sedum roof buildup cost around £35-£40 per square metre. Plus a bit extra for delivery. Labour is probably around £200 per person per day – depending on who you hire.

Are sedum roofs heavy?

Weight of standard Sedum roof

A standard Sedum roof has a saturated weight of about 80 kg/m². If necessary, this weight can be reduced to approximately 40 kg/m² for roofs that can only bear a lightweight green roof system.

Can you walk on a sedum roof?

Yes, you can occasionally walk on a Sedum roof. For instance, when you fertilize the roof once a year, walking on the Sedum plants is not a problem. However, be careful if it freezes: it is not advisable to walk on the vegetation if the plants are frozen, you may damage them.

Why green roofs are a bad idea?

Disadvantages of a Green Roof

A green roof will be more expensive to install than a traditional flat roof, as the underlying structure may have to be strengthened to cope with the extra load. Green roofs offer so many benefits that you would be crazy not to consider an installation in an appropriate area.

Why green roofs are bad?

2 Green roof vegetation can shade buildings and increase evapotranspiration, which shifts a roof’s energy balance (or “budget”). The net effect reduces the temperature of the roof and air directly above it during the day and at night.

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How long do green roofs last?

How long will my roof last with a green roof? A properly installed and maintained green roof should extend the life of the roof 2-3 times its normal life. 30 to 50 years is not an unusual lifespan for green roofs in Europe.

Roofs and roofing