Division C - Accepted Materials
Group - Vegetated Roof Systems
Hydrotech Extensive Garden Roof® Assembly
by Hydrotech Membrane Corporation
| 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 material 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
- Hydrotech Membrane Corporation
- Accepted for the RoofStar Guarantee Program
- October 25, 2024
- Accepted for application in
- Vegetated Roof Systems
- Acceptance Criteria
- Refer to the RGC Standard for Vegetated Roofs
- System Summary
- The Extensive Garden Roof® Assembly is designed for locations that will receive little maintenance or where structural capabilities are a concern. It is not intended for recreational use and is typically chosen for its appearance or to help reduce the "urban heat island" effect and minimize stormwater run-off. Extensive vegetated roofs only require a shallow growing media depth, generally as little as :75 mm to 150 (depending on the region), and therefore add little weight to the roof structure below when compared to a standard ballasted PMR roof.
- Recommended plant types for extensive vegetated roofs need to be drought, wind and frost resistant, such as self-generating sedums, herbs, grasses and other vegetation that can withstand harsh growing conditions.
- The water stored in the growing media and drainage/retention layer is sufficient to sustain the drought resistant plants between periods of normal rainfall. Thinner assemblies and very lightweight growing media blends are available for Extensive Garden Roof® Assemblies.
- Manufacturer online resources
- Extensive Garden Roof Assembly
- System Type
- Extensive
- System Depth
- 101.6 mm (4") to 203.2 mm (7")
- Growing Media Depth
- 76.2 mm (3") to 152.4 mm (6")
- Vegetation Profile
- varieties of sedums
- 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)
- Conventionally Insulated Roof Assembly by roofing Contractor
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- Guarantor's Notes
- 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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