Materials:CGT Rooftop Planter Intensive Layered System

Division C - Accepted Materials
Group - Vegetated Roof Systems

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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.

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) Plants-Trees-Shrubs-Ground cover (Selected by designer) Semi-Intensive Growing Media or Intensive Growing Media Water Retention Layer - Optional CGT Geofoam Void Fill or Recycled Foam Glass Aggregate CGT 0.75" Drainage Filter Layer CGT Vertical Drainage Layer CGT Root Barrier Planter Waterproofing by roofing Contractor - see Part 14 of the related RGC Standard for waterproofing roofs concerning the waterproofing of structural planters CGT Link Planter - Optional connecting planter system offered by CGT 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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