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| | *[https://rpm.rcabc.org/images/d/d4/CGT_Intensive_Growing_Media_TDS.pdf '''Intensive Growing Media'''] | | *[https://rpm.rcabc.org/images/d/d4/CGT_Intensive_Growing_Media_TDS.pdf '''Intensive Growing Media'''] |
| | *[https://rpm.rcabc.org/images/5/55/CGT_Mineral_Wool_Retention_Layer_TDS.pdf '''Water Retention Layer'''] - Optional | | *[https://rpm.rcabc.org/images/5/55/CGT_Mineral_Wool_Retention_Layer_TDS.pdf '''Water Retention Layer'''] - Optional |
| − | *[https://rpm.rcabc.org/images/c/cc/CGT_Geofoam_Fill_TDS.pdf '''CGT Geofoam Void Fill'''] | + | *[https://rpm.rcabc.org/images/c/cc/CGT_Geofoam_Fill_TDS.pdf '''CGT Geofoam Void Fill'''] or [https://rpm.rcabc.org/images/b/ba/CGT_Recycled_Foam_Glass_Aggregate_TDS.pdf '''Recycled Foam Glass Aggregate'''] |
| | *[https://rpm.rcabc.org/images/3/3f/CGT_.75%E2%80%9D_Drainage_Filter_Layer_TDS.pdf '''CGT 0.75" Drainage Filter Layer'''] | | *[https://rpm.rcabc.org/images/3/3f/CGT_.75%E2%80%9D_Drainage_Filter_Layer_TDS.pdf '''CGT 0.75" Drainage Filter Layer'''] |
| | *[https://rpm.rcabc.org/images/b/ba/CGT_Vertical_Drainage_Layer_TDS.pdf '''CGT Vertical Drainage Layer'''] | | *[https://rpm.rcabc.org/images/b/ba/CGT_Vertical_Drainage_Layer_TDS.pdf '''CGT Vertical Drainage Layer'''] |
Revision as of 16:44, 19 June 2026
Division C - Accepted Materials
Group - Vegetated Roof Systems
CGT Rooftop Planter Intensive Layered 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) Rooftop Planter Intensive Layered System is designed for container planting on structures. This system combines the design of the CGT Intensive Layered Vegetated Roof System with other common planter components like lightweight fill, insulation, and a Vertical Drainage Layer, to get the most out of your container or planter wall design. This system balances weight, drainage and plant health for ornamental trees, shrubs, and flowers in the unique conditions within the rooftop planter wall or container of your choosing.
- The Rooftop Planter Intensive Layered System is a deeper media system using Columbia Green’s Intensive growing media blend and can be used with an array of custom metal planters. The Intensive system provides design flexibility. It consists of a root barrier, drainage layer, filtration layer, and optional lightweight foam fill (Geofoam, XPS or Foam Glass Aggregate). A Vertical Drainage Layer wraps the sides of the planter to eliminate hydrostatic pressure and promote drainage. This is a full Planter System that will promote plant health, allowing airflow in the drainage layer and through the media and bring the most thriving results on your rooftop garden.
- (Adapted from the system's technical literature)
- Manufacturer online resources
- CGT Rooftop Planter Semi-Intensive-Intensive Layered System
- System Type
- Intensive†
- System Depth
- 330.2 mm (13") to 1244.6 mm (49")
- Growing Media Depth
- 304.8 mm (12") to 1219.2 mm (48")
- Vegetation Profile
- Perennials-Woody Plants-Trees
- 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)
- Planter Waterproofing by roofing Contractor - see Part 14 of the related RGC Standard for waterproofing roofs concerning the waterproofing of structural planters
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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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