Difference between revisions of "Materials:CGT Extensive Layered Vegetated Roof System"

Revision as of 17:16, 17 June 2026

Division C - Accepted Materials
Group - Vegetated Roof Systems

CGT Extensive Layered Vegetated Roof System
by Columbia Green Technologies LLC

System/Material Acceptance and Product Details

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.

Vegetated Roof System Manufacturer: 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 RGC Standard for Vegetated Roofs
System Summary: The Columbia Green Technologies (CGT) Extensive Layered System is a lightweight built-up vegetated roof system that accommodates a variety of layouts. The system’s layers can be easily shaped to fit curves and angles.

This system is designed by CGT to enhance stormwater management by capturing rainwater and irrigation, which can reduce or eliminating runoff. It is specifically engineered to promote healthy plant root development by ensuring adequate airflow throughout the system.

Due to the limited depth of the growing media, Extensive Layered Systems are typically planted with low-growing sedum varieties well-suited for rooftop environments. Growing media depths are determined by structural considerations, plant selection, and stormwater retention objectives.

Manufacturer online resources: [link page name]
System Type: Extensive
System Depth: 110 mm (4.38") to 240 mm (9.38")
Growing Media Depth: 80 mm (3") to 200 mm (8")
Vegetation Profile: Sedum-Herbaceus-Grasses
Suitable climate zones: All BC zones, subject to manufacturer's approval
System Components^*: In the usual order, from top to bottom; click on link for Technical Data Sheet (TDS)

CGT Sedum Mat or CGT Sedum Tile CGT Extensive Growing Media CGT 1" Water Retention Layer CGT 0.375" Drainage Filter Layer CGT Root Barrier Roof Assembly by roofing Contractor CGT Metal Edger CGT Drain Box

^†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 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 Article 1.1.3.6..

^*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 Part 3 of Division A for more about coverage.

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@@ Line 23: / Line 23: @@
 ;Accepted for application in: Vegetated Roof Systems
 ;Acceptance Criteria: Refer to the [[VRA Standard | RGC Standard for Vegetated Roofs]]
-;System Summary: description here, using <br>breaks
+;System Summary: The Columbia Green Technologies (CGT) '''Extensive Layered System''' is a lightweight built-up vegetated roof system that accommodates a variety of layouts.  The system’s layers can be easily shaped to fit curves and angles.
+:This system is designed by CGT to enhance stormwater management by capturing rainwater and irrigation, which can reduce or eliminating runoff. It is specifically engineered to promote healthy plant root development by ensuring adequate airflow throughout the system.
+:Due to the limited depth of the growing media, '''Extensive Layered Systems''' are typically planted with low-growing sedum varieties well-suited for rooftop environments. Growing media depths are determined by structural considerations, plant selection, and stormwater retention objectives.
 <br>
 <div style="text-align: left;">
@@ Line 33: / Line 37: @@
 ;Manufacturer online resources: [link page name]
 ;System Type: Extensive
-;System Depth: give range
+;System Depth: 110 mm (4.38") to 240 mm (9.38")
-;Growing Media Depth: give range
+;Growing Media Depth: 80 mm (3") to 200 mm (8")
-;Vegetation Profile: give manufacturer's profile name or description
+;Vegetation Profile: Sedum-Herbaceus-Grasses
-;Suitable climate zones: give range or list zone numbers
+;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)
 :{| class="wikitable"
 |-
 |
-*[link '''Component name''']
+*[https://rpm.rcabc.org/images/5/5f/CGT_Pregrown_Sedum_Mat_TDS.pdf '''CGT Sedum Mat'''] or [https://rpm.rcabc.org/images/c/c4/CGT_Pre-Grown_Sedum_Tile_TDS.pdf '''CGT Sedum Tile''']
-*[link '''Component name''']
+*[https://rpm.rcabc.org/images/8/88/CGT_Extensive_Growing_Media_TDS.pdf '''CGT Extensive Growing Media''']
-*[link '''Component name''']
+*[https://rpm.rcabc.org/images/5/55/CGT_Mineral_Wool_Retention_Layer_TDS.pdf '''CGT 1" Water Retention Layer''']
-*[link '''Component name''']
+*[https://rpm.rcabc.org/images/c/ce/CGT_.375%E2%80%9D_Drainage_Filter_Layer_TDS.pdf '''CGT 0.375" Drainage Filter Layer''']
-*[link '''Component name''']
+*[https://rpm.rcabc.org/images/a/a4/CGT_Root_Barrier_ML2109_TDS.pdf '''CGT Root Barrier''']
-*[link '''Component name''']
+:'''Roof Assembly''' by roofing ''Contractor''
-*[link '''Component name''']
-*[link '''Component name''']
+*[https://rpm.rcabc.org/images/4/4c/CGT_Metal_Edger_for_Layered_System_TDS.pdf '''CGT Metal Edger''']
+*[https://rpm.rcabc.org/images/8/8a/CGT_Drain_Box_TDS.pdf '''CGT Drain Box''']
 |}
 </div>