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Inspection and Maintenance: Green Roofs (view source)
Revision as of 14:23, 11 August 2022
, 2 years agono edit summary
*For green roofs with [[Green roofs#Irrigation|automated irrigation systems]] using municipal/drinking water, schedule watering to occur at night or early in the morning to minimize the loss of water to evaporation;
*For green roofs with [[Green roofs#Irrigation|automated irrigation systems]] using municipal/drinking water, schedule watering to occur at night or early in the morning to minimize the loss of water to evaporation;
*For green roofs with [[Green roofs#Irrigation|automated irrigation systems]] using cistern water, irrigating during the day when evaporation rate is high will make greater use of stored rainwater, thereby freeing up more storage in the system for the next rain storm and helping to reduce site runoff volume.
*For green roofs with [[Green roofs#Irrigation|automated irrigation systems]] using cistern water, irrigating during the day when evaporation rate is high will make greater use of stored rainwater, thereby freeing up more storage in the system for the next rain storm and helping to reduce site runoff volume.
==Rehabilitation & Repair==
Table below provides guidance on rehabilitation and repair work specific to green roofs organized according to BMP component. <br>
[[File:Spray-Irrigation.jpg|thumb|400px|Picture of a spray nozzle used in an automatic spray irrigation system on a green roof. When the irrigation system shows sings of leaking, either from the distribution line, fitting or sprinkler nozzle then [[[Testing#Green Roof Irrigation System|testing and repair work]] must be scheduled shortly to identify the problem area. (Photo Source: Vegetal I.D., n.d.)<ref>Vegetal i.D. n.d. Green Roof Irrigation. Accessed May 10 2022: https://www.vegetalid.us/green-roof-technical-resources/extensive-green-roof-design-guide/270-green-roof-irrigation.html</ref>]]
{|{| class="wikitable" style="width: 900px;"
|+'''Green Roofs: Key Components, Typical Issues and Rehabilitation Requirements'''
|-
!Component
!Problem
!Rehabilitation Tasks
|-
| rowspan="3"|'''[[Green roof media|Growing Media]]'''
|Eroded growing media area ≥ 30 cm in length or other damage is present
|
*Restore [[Green roof media|Growing Media]] to required depth with material that meets design specifications, replant and irrigate bi-weekly or as needed until [[Green roofs: Planting|plantings]] are established. If problems persist, consider covering with matting or other [[Construction: erosion and sediment control measures|erosion control measure]] until plantings are established or adding parapets or other wind break structures.
|-
|Surface ponding remains for > 3 hours after the end of a storm event because water does not infiltrate through the growing media
|
*Aerate (i.e., rake) or replace growing media in problem areas taking care not to damage the drainage or protective layers.
|-
|Surface ponding remains for > 3 hours after the end of a storm event because the drainage layer is [[Clogging|clogged]].
|
*Consult with green roof designer or product manufacturer/vendor to determine corrective actions.
|-
|'''[[Vegetation]]'''
|
[[Green roofs: Planting|Plants]] are not thriving and [[Green roof media|Growing Media] is low in [[organic matter]] (< 3 %) or available phosphorus (< 2.2 mg/kg)
|
*Amendment or [[Phosphorus testing in media|fertilizer application]] should be prescribed by the medium manufacturer or product vendor.
|-
|'''[[Overflow|Overflow outlets]]'''
|
Surface ponding remains for > 3 hours after the end of a storm event because [[overflow|overflow outlet]] is obstructed.
|
*Remove the obstruction which may require the use of a pressure washer or drain-snaking service.
|-
|'''[[Green roofs#Irrigation|Irrigation system]]'''
|
Distribution line, fitting or sprinkler nozzle is leaking, damaged or misaligned.
|
*Identify the location of the damaged system component through [[Testing#Green Roof Irrigation System|testing]] (i.e., running the system in each zone while making observations). Turn off the system and schedule the repair work.
|-
|'''[[Testing#Green Roof Leak Detection Testing|Protective Layers]]'''
|
Water-proofing membrane has reached 40 years of age and is due for [[Testing#Green Roof Leak Detection Testing|replacement]].
|
*Deconstruct the green roof, replace the water-proofing membrane with new material, and reconstruct with materials that meet design or product specifications.
|}