| Symptom | Possible causes | Solution |
|---|---|---|
| Standing water within the green roof for more than 72 hours | The drainpipe may be clogged with sediment or debris due to erosion or compaction |
|
| Vegetation is not able to establish | Plant selection is inappropriate for the site, they are not getting enough water or sunlight | Consult with a landscaper or horticulturist. Check that plants are suited to the local conditions. Water during the first growing season and during droughts. |
| Leaks inside the building | The underlying membrane may have been damaged | Identify the location and repair the damaged portion of the membrane |