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Inspection and Maintenance: Green Roofs (view source)
Revision as of 14:29, 8 August 2022
, 2 years agono edit summary
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|colspan="7" style="text-align: center;" |'''<u><span title=>Note:''' (x) denotes indicators to be used for Performance Verification inspections only (i.e., not for Maintenance Verification inspections) </span></u>
|colspan="7" style="text-align: center;" |'''<u><span title=>Note:''' (x) denotes indicators to be used for Performance Verification inspections only (i.e., not for Maintenance Verification inspections) </span></u>
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==Construction Inspection Tasks==
Construction inspections take place during several points in the construction sequence, specific to the type of LID BMP, but at a minimum should be done '''weekly''' and include the following:
# During site preparation, prior to BMP installation to ensure the roof structure is ready for green roof construction work and confirm that BMP layout area matches approved design drawings and that construction materials meet design specifications
# After installation of leak detection system (if applicable) to ensure it was done properly
# At installation of water-proofing membrane, prior to installation of root barrier, drainage layer and overflow outlets to ensure it was done properly and to confirm that slopes are acceptable
# After installation of root barrier, drainage layer (including filter fabric/layer) and overflow outlets, prior to installation of growing medium and plants to ensure it was done properly and confirm that depth and slopes are acceptable
# After installation of growing medium layer and plants to ensure it was done properly and to confirm depth, slopes and elevations at overflow outlets are acceptable; After installation of irrigation system to confirm system is functioning
# Prior to hand-off points in the construction sequence when the contractor responsible for the work changes (i.e., hand-offs between the building and green roof installation contractors)
# After every large storm event (e.g., 15 mm rainfall depth or greater) to ensure roof drainage or flow diversion devices are functioning and adequately maintained. You can also download and print the table [https://wikidev.sustainabletechnologies.ca/images/6/6b/LID-IM-Guide-7.6-Green-Roofs.pdf '''here''']<br>
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[[File:MaintenancePICP.png|thumb|400px|A Vacuum Truck used for [[permeable pavement]] maintenance, which sucks up excess sediment and fines trapped between the pores of block pavers. Conducting this maintenance regularly helps maintain the practice's optimal infiltration rate during large rain events. (Source: STEP).]]
{| class="wikitable" style="width: 800px;"
|+'''Permeable Pavements: Green Roofs'''
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!<br>'''Construction Sequence Step & Timing'''
!<br>'''Inspection Item'''<br>
!<br>'''<u><span title="Note for Observation Column: S = Satisfactory; U= Unsatisfactory; NA = Not Applicable ">Observations*</u>'''<br>
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|rowspan="6"|'''Site Preparation''' - after site clearing and grading, prior to BMP excavation and grading
|Natural heritage system and tree protection areas remain fenced off
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|ESCs protecting BMP layout area are installed properly
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|CDA is stabilized or runoff is diverted around BMP layout area
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|BMP layout area has been cleared and is staked/delineated
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|Benchmark elevation(s) are established nearby
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|Construction materials have been confirmed to meet design specifications
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|rowspan="2"|'''BMP Excavation and Grading''' - prior to backfilling and installation of pipes/catchbasins
|Excavated soil is stockpiled outside the CDA
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|Excavation location, footprint, depth and slope are acceptable
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|rowspan="6"|'''BMP Installation''' – after installation of pipes/catchbasins, prior to completion of backfilling
|Structural components (e.g., pavement base, curbs) installation is acceptable
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|Impermeable liner installed correctly, if applicable
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|Installations of sub-drain pipes (e.g., locations, elevations, slopes), standpipes/monitoring wells are acceptable
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|Sub-drain trench dams installed correctly (location, elevation)
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|Surface coarse installation (elevation, slope, monitoring wells) is acceptable
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