Overview and schedule of general maintenance activities for green roofs
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Overview and schedule of general maintenance activities for green roofs

Overview and schedule of general maintenance activities for green roofs
Link to this table

First Year of Operation
Activity	Frequency	Time period	Level of effort	O&M benefit^a
Check that there is no ponding	Bi-weekly	All year long	1-2 hours	1
Inspect roof drain for sediment, vegetation, or debris	Triannually or after 24hr-10yr event	All year long	1-2 hours	1
Inspect membrane and vegetation free zones	Bi-weekly	All year long	2-4 hours	1
Check erosion control measures	Bi-annually	All year long	1-2 hours	1
Weeding and invasives control	2-4 weeks during the growing season	Growing season	2-4 hours	2,4,5,6
Supplemental watering	When rainfall is <0.5 inches over 10-15 days	First growing season	2-4 hours	2,4,5,6
Inspect plant growth and growth medium	Biweekly	First growing season	2-4 hours	2,3,4,5,6
Remove and replace dead plants	As needed	First growing season	2-4 hours	2,3,4,5,6
Spot reseeding of bare patches and eroding areas	As needed	First growing season	2-4 hours	2,3,4,5,6
After First Year of Operation
Activity	Frequency	Time period	Level of effort	O&M benefit^a
Check that there is no ponding	Biannually	Any time when ground is not frozen	1-2 hours	1
Inspect membrane and vegetation free zones	Annually	All year long	2-4 hours	1
Inspect roof drain for sediment, vegetation, or debris	Triannually or after 24hr-10yr event	All year long	1-2 hours	1
Remove and replace dead plants	Biannually	Fall and Spring	2-4 hours	2,3,4,5,6
Weed and remove invasive plants	Twice during growing season	Growing season	2-4 hours	2,3,4,5,6
Supplemental watering	As needed during extended dry periods	Dry periods	1-2 hours	2,3,4,5,6
Inspect for and repair broken inlets or pipes	As needed	All year long	2-4 hours	1
Prune trees and shrubs, and cut back dead or excessive vegetation	Annually	In fall or spring	2-4 hours	2,3,4,5,6
Inspect growth medium for continued viability	Quarterly	All year long	2-4 hours	2,3,4,5,6
Fertilizing	Twice during growing season	Growing season	1-2 hours	2,3,5,6
After 5+ Years of Operation (non-routine maintenance)
Activity	Frequency	Time period	Level of effort	O&M benefit^a
After long term operation of the practice, some occasional and infrequent maintenance activities might be required, such as bigger repairs, replacement of the waterproof barrier, or redesign of key elements of the practice.	As needed	As needed	Could be significant depending on the activity	1,2,3,4,5,6
^aKey to Maintenance Benefits: Proper stormwater flow and infiltration Creation and maintenance of wildlife habitat Creation and maintenance of pollinator habitat Nutrient cycling and storage Aesthetics and public enjoyment Carbon sequestration