Making green roofs yourself - that's how it works


If you proceed carefully and professionally and use the right material, you can create a green roof yourself. What you need to know and pay attention to, and how to build the green roof correctly, is revealed in the following instructions.

Check before

  • Carrying capacity of the roof
  • roof pitch
  • Diameter and position of the roof outlet
  • existing roof seal

Based on these factors, it is possible to judge whether greening is possible.

Carrying capacity of the roof

Green roofs represent a high roof load. For extensive greening, the roof must carry at least 60 - 80 kg load. For intensive green roofs, roof loads over 100 kg must be possible.

roof pitch

Roof slopes between 0 and 5 degrees are optimal. Sloping roofs require a special static assessment and special construction measures.

Diameter and position of the roof outlet

The roof drain must be at a suitable location and have a sufficiently large diameter.

Existing roof seal

The existing roof seal must also remain sufficiently tight under the weight of the greenery. Checking for leaks and damage has been necessary before.

Intensive versus extensive greening

Extensive greenery is planted with cacti, mosses and succulents. They only have one substrate layer.

Intense green areas have a complete floor structure. They can be planted with all garden plants. They carry roof loads of more than 100 kg. The cooling effect on the underlying rooms is greater through the evaporative cooling than in extensive green areas.

The individual layers are built up to the soil layer in both types of greenery the same.

greening packages

Individual manufacturers, such as Optigreen, offer "greening packages". These packages include all necessary layers for extensive greening.

Before attaching the greenery, the roof seal must be checked to see if it is suitable. Otherwise, an additional sealing layer must be applied.

Green roof (extensively) build up correctly

  • "Greening package" with individual layers
  • ev. sand (for seeds)
  • Seed or
  • Extensive-planting
  • screwdriver
  • cutter
  • rake
  • broom

1. Check the roof and clean it

Check the roof seal for leaks and damage. Clean the roof swept clean. There must be no chips or splinters on the roof.

2. Lay the root protection foil

Spread the root protection foil and cut to size. Lay several foils with 1.5 meters overlap. Put the ends under the sheet metal storage. Cut a correspondingly large hole in the foil in the drainage area.

3. Lay protective fleece

Lay the protective fleece with 10 cm overlap. Cut and put under the sheet metal storage. Cut a hole in the drainage area.

4. Lay solid-state drainage

Pay attention to the correct position of the top. Lay out the plates and let them overlap a few centimeters. Cut a hole in the plates in the area of ​​the roof outlet.

5. Lay the filter fleece

Spread the filter fleece taut and lay it with about 10 cm overlap. Cut a hole in the area of ​​the roof drain.

6. Insert the inspection shaft

Insert the inspection shaft above the roof drain.

7. Apply substrate

Spread extensively and roughly distribute. Make a uniformly thick layer of about 6 - 8 cm with the rake. Cut filter fleece slightly above layer height.

8. Apply or plant seeds

Either mix the seeds evenly with sand, or apply the prepared planting.

9. Watering

Soak the roof surface until all layers have been moistened. During the rooting phase (about three weeks, depending on the planting) keep constantly moist.

Tips & Tricks

A planting concept should also create for extensive greening as possible the expert. This creates a balanced look.


Video Board: DIY living green roof installation