Green roofs in own construction - in 7 steps

Green roofs in own construction - in 7 steps

A carport green roof can be created in just a few steps. Precise planning is important so that self-built construction leads to success.

Before starting with the self-construction of carport green roofs, some preliminary considerations have to be made. The most important thing is to check whether the roof is suitable for landscaping. Decisive for this are the statics and inclination of the roof. Once these points have been clarified, the project "Homebuilding of the Carport Green Roofing" can start.

1. Preparations for the self-made green roof

In the first step, the substrate must be prepared accordingly. This must be clean swept off to lay out a mineral wool mat. The mat, which stores water and contains important nutrients, serves as a base and root protection foil for green roofs.

2. Laying out the drainage

The drainage layer is required with a roof pitch of less than two percent to drain excess water. A carpet knife is suitable for cutting the drainage plates. Small unevenness on the roof can be leveled out with gravel under the drainage layer.

3. Laying filter fleece

The filter fleece comes between the drainage and substrate layers. It is used for slurrying the drainage and prevents the washing out of nutrients. The fleece is to be laid with ten centimeters overlap on the drainage layer. Good suppliers of filter fleece mats and other green roofing materials are Optigreen or Topgreen.

4. Free cutting of existing roof drains

Existing roof drains must be left out when laying out the drainage and nonwoven layer. This ensures a smooth drainage of excess water.

5. Distributing the Roof Substrate

The next step consists of distributing the roof substrate. Per square meter, three bags of substrate are expected. It is important that when applying a layer of substrate approximately six centimeters high covers the entire filter fleece. Existing roof drains should be skipped when distributing.

6. Planting the green roof

When selecting the plants, it should be noted that they survive both heat and dry periods as well as frost in winter. Flat-bales, Sedum plants and ground cover are good for planting. Extensively planted roofs impress with their low surface load and natural vegetation. When planting, the roots should be firmly pressed and covered with substrate.

7. Care of the green roof

In the initial phase, regular watering of the new plants is necessary. Later, a slow-release fertilizer helps to prevent deficiency symptoms and to provide the plants with nutrients. Autumn is the ideal season for pruning old and overgrown plants. In addition, the roof must be checked annually for any damage.

Laying drainage: what does it cost?

We answer these and many other questions in the price radar relating to drainage.

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