Division C - Accepted Materials
Group - Vegetated Roof Systems
CGT Pregrown Tray 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.
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- 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) Pregrown Tray Vegetated Roof System provides a turnkey solution that meets or exceeds all guidelines for green roofs. The trays are easy to install and feature interlocking edges which prevent shifting or migration of growing media onto the roof system. At 609.6 mm x 609.6 mm x 117.5 mm deep (24” x 24” x 4.625”), the pre‐grown tray is appropriate for extensive and semi‐intensive vegetative roof profiles. The modules are pre‐grown with plants (most commonly sedum) selected by the project designer and shipped to the job site with approximately 90%+ vegetation coverage.
- Comprised of a heavy duty recycled polypropylene, the CGT Pregrown Tray Vegetated Roof System is designed with a channelized bottom to maximize stormwater retention. It can reduce both the amount and rate of stormwater run‐off and is capable of retaining up to 70% of annual precipitation. Detailed stormwater retention calculations and hydrographs are available upon request.
- (Adapted from the system's technical literature)
- Manufacturer online resources
- CGT Pregrown Tray Vegetated Roof System
- System Type
- Extensive
- System Depth
- 117.5 mm (4.625”)
- Growing Media Depth
- 117.5 mm (4.625”)
- Vegetation Profile
- Sedum- Grasses- Herbaceous
- 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)
- Roof Assembly by roofing Contractor
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- †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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