
Growing Sustainable Roofs
When sustainability is at the top of your roofing needs, a vegetative roof from Dow Roofing Systems is a proven method for creating an environmentally friendly cool roof. The GardenTop™ System combines high-performance TIEMPO™+ 2000 TPO or VIENTO™ PVC roofing membrane, insulation and water management technology to deliver maximum roof life, design flexibility and installation efficiency.
Related Information
GardenTop™ Brochure (272KB PDF)
TIEMPO™+ 2000 TPO Membrane GardenTop™ Extensive Roof System Guide Specification (1MB PDF)
TIEMPO™+ 2000 TPO Membrane GardenTop™ Intensive Roof System Guide Specification (1MB PDF)
VIENTO™ PVC Membrane GardenTop™ Extensive System Guide Specification (980KB PDF)
VIENTO™ PVC Membrane GardenTop™ Intensive System Guide Specification (892KB PDF)
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system overview
Also called green roofs, garden roofs, eco-roofs and living roofs, vegetative roofs have a long and proven history in Europe and are gaining in popularity in North America and elsewhere. A GardenTop™ Roof System features advanced waterproofing membrane technology with TIEMPO™+ 2000 TPO and VIENTO™ PVC membranes. In addition, it includes a variety of high-performance, high compressive strength extruded polystyrene or polyisocyanurate insulations and water management technology designed to support the needs of a vegetative roof.
GardenTop™ Roof Systems may be specified for both intensive and extensive vegetative roof assemblies. The main differences between the two are depth of growing medium, and placement of the roofing membrane, insulation and drainage system.
A vegetative roof delivers many benefits to the building owner and surrounding community. Studies worldwide have clearly demonstrated that vegetative roofs make a positive impact on their local environment that ripples through the larger eco and economic systems they affect.
Vegetative roofs help:
- Clean the air of particulate matter
- Create habitat areas for indigenous wildlife
- Provide aesthetic appeal to surrounding locations
- Reduce the urban heat island effect prevalent in many metropolitan areas
- Control storm water run-off, absorbing it and then releasing it slowly
Protected from environmental exposure, like ultraviolet radiation and temperature extremes, properly installed and maintained vegetative roofs can have longer life spans than other roof types.
| Comparison of Intensive and Extensive Vegetative Roof Assemblies | |
| Intensive | Extensive |
| Soil depth greater than 6" | Soil depth 2"-6" |
| Supports a greater variety of plant life | Best suited for "conventional" roof assemblies and simple drainage systems |
| Requires increased structural load carrying capacity and greater sophistication in design, construction and maintenance | Fully adhered roof assembly |
| Places the insulation above the membrane | Places the insulation below the membrane |
| High-density, closed-cell insulation | High density, closed-cell insulation |
| GardenTop™ RoofDrain multi-component drainage system placed above and below insulation | GardenTop™ RoofDrain placed on top of membrane |
components
Dow Roofing Systems provides a full line of component products designed to work together to complete the GardenTop™ Roof System assembly. Your Dow Roofing Systems sales representative can help select the best products for your vegetative roof needs.
| GardenTop™ Roof System Components |
| Membranes |
| TIEMPO™+ 2000 TPO (60 mil and 80 mil) |
| VIENTO™ PVC (60 mil) VIENTO™ PVC Fleece (60 mil) |
| Insulation and Cover Boards |
| STYROFOAM™ Brand Extruded Polystyrene Foam Insulation |
| TERMICO™ Polyisocyanurate Insulation |
| DensDeck† and DensDeck† Prime Cover Boards |
| Adhesives and Sealants (specific to membrane and insulation) |
| Dow 2000 Membrane Adhesive (Low-VOC) Dow 2000 Membrane Adhesive (Solvent-Based) Dow Water-Based Fleece Membrane Bonding Adhesive Dow 2000 Insulation Adhesive (2-Part Urethane) Dow Insulation Adhesive INSTA STIK™ Quik Set Commercial Roofing Adhesive OlyBond‡ Classic Insulation Adhesive OlyBond‡ 500 Insulation Adhesive VIENTO™ PVC Bonding Adhesive Dow 2000 Edge Sealant Dow 2000 Multi-Purpose Sealant (36KB PDF) Dow 2000 Pourable Sealer A & B VIENTO™ PVC Cut Edge Sealant |
| Water Management |
| GardenTop™ RoofDrain 50RS and 100RS GardenTop™ RoofDrain 200H GardenTop™ RoofDrain 200V GardenTop™ RoofDrain 650 |
† DensDeck is a trademark of Georgia-Pacific
‡ OlyBond is a trademark of OMG Inc.


