View source for Materials:CGT Hybrid (Blue-Green) Vegetated Roof System

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<big><big>Division C - Accepted Materials</big></big>
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<big>Group - Vegetated Roof Systems</big>
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<big><big><big><big><big>CGT Hybrid (Blue-Green) Vegetated Roof System</big></big></big></big></big><br>
<big><big><big>by Columbia Green Technologies LLC</big></big></big><br>
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The information published in the RCABC '''''Roofing Practices Manual''''' and offered below does NOT represent a complete set of the manufacturer’s data or specifications, nor is this system and its various materials recommended or endorsed by the '''''Guarantor'''''. The preparation of a detailed specification is the responsibility of the ''Design Authority''.
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;'''Vegetated Roof System Manufacturer''':  [https://columbia-green.com/  ''' https://columbia-green.com/''']
;Accepted for the ''RoofStar Guarantee Program'': June 11, 2026
;Accepted for application in: Vegetated Roof Systems
;Acceptance Criteria: Refer to the [[VRA Standard | RGC Standard for Vegetated Roofs]]
;System Summary: The Columbia Green Technologies (CGT) '''Hybrid (Blue-Green) Vegetated Roof System''' allow for rooftop detention underneath our Tray and Layered Green Roof systems.  This hybrid system allows you to maximize your rooftop for stormwater management‐ allowing for projects that want to green the rooftop, while also providing stormwater detention.
   
:The Water Storage Unit by Columbia Green Technologies (CGT) is a made up of thin‐walled cylindrical columns injection molded of recycled resin of polypropylene for strength and durability.  Water storage units are easy to cut to shape in the field, to work around irregular shapes.

:(Adapted from the system's technical literature)
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;Manufacturer online resources: [https://columbia-green.com/wp-content/uploads/2020/10/CGT_WATER_STORAGE_UNITS_TIS.pdf Hybrid (Blue-Green) Vegetated Roof System]
;System Type: Extensive
;System Depth: 212.8 mm (8.38") to 349 mm (13.38")
;Growing Media Depth: 212.8 mm (8.38") to 349 mm (13.38")
;Vegetation Profile: Sedum-Herbaceus-Grasses
;Suitable climate zones: All BC zones, subject to manufacturer's approval
;System Components<sup>*</sup>: In the usual order, from top to bottom; click on link for Technical Data Sheet (TDS)
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*[https://rpm.rcabc.org/images/5/5f/CGT_Pregrown_Sedum_Mat_TDS.pdf '''CGT Sedum Mat'''], [https://rpm.rcabc.org/images/c/c4/CGT_Pre-Grown_Sedum_Tile_TDS.pdf '''CGT Sedum Tile'''], or pre-grown vegetation in trays by manufacturer
*[https://rpm.rcabc.org/images/8/88/CGT_Extensive_Growing_Media_TDS.pdf '''CGT Extensive Growing Media''']
*[https://rpm.rcabc.org/images/5/55/CGT_Mineral_Wool_Retention_Layer_TDS.pdf '''CGT 1" Water Retention Layer'''] or [https://rpm.rcabc.org/images/4/4a/CGT_Standard_Water_Retention_Layer_TDS.pdf '''Standard Water Retention Layer'''] (Consult system manufacturer)
*[https://rpm.rcabc.org/images/c/ce/CGT_.375%E2%80%9D_Drainage_Filter_Layer_TDS.pdf '''CGT 0.375" Drainage Filter Layer''']
*'''CGT Geogrid'''
*'''CGT Water Detention Unit'''
*'''CGT Geotextile Fabric'''
*[https://rpm.rcabc.org/images/a/a4/CGT_Root_Barrier_ML2109_TDS.pdf '''CGT Root Barrier''']
:'''Roof Assembly''' by roofing ''Contractor''

*[https://rpm.rcabc.org/images/4/4c/CGT_Metal_Edger_for_Layered_System_TDS.pdf '''CGT Metal Edger''']
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;<sup>†</sup>Guarantor's Notes: Systems labeled "Inverted" are designed for a ''protected membrane roof assembly'', also known as an inverted ''roof assembly''.

:While ''Semi-intensive'' and ''Intensive vegetated roof systems'' are limited to only ''protected membrane roofs'' (See the [https://rpm.rcabc.org/index.php?title=VRA_Standard#1.1.3.2._Permitted_Vegetated_Roof_Systems Sentence 1.1.3.2.(5)] in the "RGC Standard for Vegetated Roofs"), some vegetated roof system manufacturers offer their systems for ''conventionally insulated roofs''.  To request a written Variance to the published limitation, follow the requirements in [https://rpm.rcabc.org/index.php?title=VRA_Standard#1.1.3.6._Variances Article 1.1.3.6.].

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;<sup>*</sup>Conditions and Limitations: Note that system thickness is dependent upon the selection of components, which is determined (in part) by design parameters, including hydrological requirements.  Consult with the ''vegetated roof system manufacturer'' for options and saturated system weight.

:Also note that vegetation coverage under the '''''RoofStar Vegetated Roof Guarantee''''' applies only to ''extensive systems'' planted with mats or trays - see [https://rpm.rcabc.org/index.php?title=Guarantee Part 3] of Division A for more about coverage.

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