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The following checklist can be used during the construction process: {| class="wikitable" style="width: 800px;"|+'''Green Roofs: Construction Inspections'''|-!<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>|-|rowspan="4"|'''Site Preparation''' - During site preparation, prior to BMP installation|Ensure the roof structure is ready for green roof construction work||-|BMP layout area and dimensions match approved design drawings ||-|CDA is stabilized or runoff is diverted around BMP layout area ||-|Construction materials have been confirmed to meet design specifications||- |'''Leak detection System''' - After installation of leak detection system (if applicable), prior to installation of water-proofing membrane|Quality control check leak detection system installation ||-|rowspan="2"|'''Water Proofing Membrane''' – After installation of waterproofing membrane, prior to installation of root barrier, drainage layer and overflow outlets |Quality control check membrane installation ||-|Confirm that slopes conform with approved design drawings ||-|rowspan="3"|'''Root barrier / Drainage layer and Overflow outlets''' – After installation of root barrier, drainage layer (including filter fabric) and overflow outlets, prior to installation of growing medium layer and plants|Quality control check root barrier and drainage layer installations||-|Installation of drainage layer (e.g., depth and slope) is acceptable||-|Installations of overflow outlets (e.g., elevation and slope) are acceptable||-|rowspan="5"|'''Filter bed''' – After installation of filter bed (growing medium layer and plants) |Quality control check installation of any structural components of growing medium layer (if applicable) ||-|Installation of growing medium (e.g., depth, elevations at overflow outlets) is acceptable ||-|Growing medium is free of ruts, local depressions ||-|Planting material meets approved planting plan specifications (plant types and quantities) ||-|Quality control check installation of erosion matting/protection (if applicable)||-|'''Irrigation System''' - After installation of irrigation system |Confirm installation is acceptable and system is functioning (through testing) ||-|}
→Key inspection points
Additional inspections may be needed depending on the number of layers in the green roof design (e.g., insulation, root barrier, and growing medium structural support layers) and may be required to comply with product warranty conditions. The green roof product vendor or designer should provide further guidance in this regard, specific to the system or product being installed.
Additional inspections may be needed depending on the number of layers in the green roof design (e.g., insulation, root barrier, and growing medium structural support layers) and may be required to comply with product warranty conditions. The green roof product vendor or designer should provide further guidance in this regard, specific to the system or product being installed.
A checklist of construction inspection steps can be found on the [[Inspection and Maintenance: Green Roofs]] page.
=Mistakes to avoid=
=Mistakes to avoid=