Division C - Accepted Materials
Group - Vegetated Roof Systems
CGT Planted-in-Place 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) Planted-in-Place Tray Vegetated Roof System, with optional built‐in irrigation, is easy to install and maintain for a successful and thriving green roof long term. The unique way the Columbia Green trays overlap, interlock, and pin together keeps the tray system from shifting and allows trays to be overfilled to hide tray lines (while preventing growing media from spilling on the roof). During installation, empty trays are laid out, filled with growing media, and then planted.
- This process is cleaner, less wasteful, and less labor intensive than other options on the market. Traditional pre‐grown tray systems have longer lead times, and must be installed immediately on arrival. The Planted‐in‐Place system materials are available on‐demand and can be installed in phases, making it the most flexible green roof system. The tray is comprised of a heavy duty recycled polypropylene and is designed to be placed directly on top of almost any roofing membrane system, eliminating the need for additional drainage, filtration or root barriers.
- Columbia Green’s trays were developed to maximize stormwater retention. The pattern of micro‐holes at the tray base slows down the movement of water through the system, increases overall retention volume, and decreases overall roof run‐off. Contact Columbia Green Technologies (CGT) for project‐specific stormwater retention calculations for your jurisdiction.
- The Planted-in-Place Tray Vegetated Roof System offers variable growing media depth, (from 5.25 to 8 inches), allowing for more planting options and flexibility than a traditional pre‐grown tray. The system has optional integrated drip irrigation, eliminating the need hand‐watering. Please see the Tray Drip Irrigation technical information sheet for more detailed information on the optional drip system.
- (Adapted from the system's technical literature)
- Manufacturer online resources
- Planted-in-Place Tray Vegetated Roof System
- System Type
- Extensive
- System Depth
- 117.5 mm (4.625”) to 203.2 mm (8")
- Growing Media Depth
- 117.5 mm (4.625”) to 203.2 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)
- 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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