Division C - Accepted Materials
Group - Vegetated Roof Systems
Hydrotech Semi-intensive 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
- Name linked to website here
- 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
- Manufacturer online resources
- Semi-intensive Garden Roof Assembly
- System Summary
- The Semi-Intensive Garden Roof® Assembly is considered a lightweight assembly, but with a slightly deeper soil depth, and is designed to support sod lawns as well as perennials.
Lawns have unique needs due to the foot traffic they experience. Designers have the ability to create large lawn areas on rooftops using a Garden Roof Semi-Intensive® Assembly. Generally accessible by adjacent hardscape areas, such as a patio, design professionals now have the opportunity to create beautiful additional usable space on projects.
The assembly incorporates a LiteTop® growing media that provides a firm structure for pedestrian areas while providing proper aeration for good root growth. Lawns require more water for proper establishment and long term growth. Hydrotech strongly recommends that a permanent irrigation be included in the assembly.
Features of the Garden Semi-Intensive® Assembly:
- Depth of growing media between 200mm and 300mm
- Increase of usable space
- Integrated hardscape options
- Regular irrigation
- Regular maintenance
Typical Application:
A Garden Roof® Assembly can expand the livable space of a building through the integration of hardscaped areas with lush landscaped areas of lawn and other vegetation. The maintenance required for these spaces is similar to the care that would be required to maintain this space at grade.
For more about maintenance, see Part 11 in the RGC Standard for Vegetated Roofs
(Adapted from the manufacturer's summary)
- System Depth
- 203.2 mm (8") to 355.6 mm (14")
- Growing Media Depth
- 152.4 mm (6") to 304.8 mm (12")
- Vegetation Profile
- as specified by the Design Authority/Green Roof Design Professional (See Conditions and Limitations below)
- Suitable climate zones
- 4, 5, 6, 7A, 7B, 8
- System Components
- Semi-intensive Litetop® Growing Media (Click here for the Technical Data Sheet PDF)
- Litetop® Filter (Click here for the Technical Data Sheet PDF)
- Litetop® Aggregate only for Gardendrain GR30 (Click here for the Technical Data Sheet PDF)
- Gardendrain GR25 or Gardendrain GR30 (Click here and here for the Technical Data Sheet PDFs)
- Root Stop Standard or Root Stop HD (Click here or here for the Technical Data Sheet PDFs)
- Root Stop Tape (Click here for the Technical Data Sheet PDF)
- GardenEdge® (Click here for the Technical Data Sheet PDF)
- 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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