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Line 27:
|-|finish grading|placement and finishing
|-|large stone and riprap|paver installation
|-|plant verification and installation|tamping
|-|mulch placement|joint cutting
|-|stabilizing contributing drainage area and planting adjacent vegetation|joint aggregate
|-| --|curbing
|-| --|stabilizing contributing drainage area
|}
→Key construction steps
=Key construction steps=
=Key construction steps=
{| class="wikitable"
{| class="wikitable" style="width: 800px;"
|+ Stage 4 guidance for vegetated LIDs and permeable pavements
|+'''Green Roofs: Construction Steps'''
|-
|-
!LID practices with vegetated surfaces
!<br>'''Green Roof Type'''
!Permeable pavements
!<br>'''Construction Steps'''<br>
|-
|-
|soil media installation and soil amendments
|rowspan="8"|'''Modular System'''
|bedding layer
|
|-
|#Sweep and blow the roof membrane clear and free of dirt, debris, and any sharp objects (such as flash clippings)
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|-
|#Inspect the waterproof membrane for any potential damage prior to installing root barrier
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|-
|#Install green roof perimeter or vegetation free zones (if applicable) a minimum 2 feet from parapet wall and around other critical infrastructure such as vents or roof drains
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|-
|#Install the root barrier (if applicable) on top of the roof membrane.
##Ensure sheet is goes up the parapet wall the full height of the green roof system (if applicable).
##Where additional root barrier sheets are laid side by side, a minimum of 30 cm overlap between sheets is needed.
##Make appropriate slits in root barrier with a retractable knife (away from existing waterproof membrane) to allow installation around roof infrastructure such as drains, air vents and stacks
##Please note that modular systems often include a root barrier built into the system but some systems recommend doubling up
|
|-
|#Install the modular system according to manufacturer specifications or green roof design
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|-
|#If modular system is installed on a slope roof, the system will need to be anchored according to manufacturer specifications or design
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|-
|#Install irrigation system installation (if applicable) according to manufacturer specifications or design
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|-
|#Backfill vegetation free zones with clear stone (if applicable)
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|-
|rowspan="9"|'''Layered System'''
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|-
|Confirm that slopes conform with approved design drawings
|
|-
|}
===Modular system===
===Layered system===
#Sweep and blow the roof membrane clear and free of dirt, debris, and any sharp objects (such as metal flashing clippings)
#Inspect the waterproof membrane for any potential damage prior to installing the root barrier
#Install green roof perimeter or vegetation free zones (if applicable) a minimum 2 feet from parapet wall and around other critical infrastructure such as vents or roof drains root free zone. Green roof perimeter may consist of metal edging which will be installed according to design and/or manufacturer’s specifications
#Install the root barrier (if applicable) on top of the roof membrane according to design or manufacturer specifications.
##Ensure sheet goes up the parapet wall the full height of the green roof system (if applicable).
##Where additional root barrier sheets are laid side by side, a minimum of 30 cm overlap between sheets is needed.
##Make appropriate slits in root barrier with a retractable knife (away from waterproof membrane) to allow installation around roof infrastructure such as drains, air vents and stacks
##Install drainage layers on top of the root barrier according to design or by manufacturers specifications
#Install filter layer according to design and manufacturer’s specifications. Ensure 30 cm overlap between adjacent rows and it runs up green roof edging (perimeter) the full thickness of the green roof
#Place green roof growing medium to specified depth within the design or manufacturer’s specifications. Growing media is typically blown onto the filter fabric layer by blower truck.
#Install plants and vegetation according to design
#If rolled vegetated mat system, take sedum clippings and infill sparsely vegetated areas
#Install irrigation system according to design and/or manufacturer’s specifications
===Modular system===
===Modular system===