Green Roof

Extensive Green Roofs

Extensive roofs are typically lightweight and can be installed over a variety of structures including metal roof decks. Extensive roofs are not intended for recreational use and are typically used to minimize storm weather run off and help reduce the “urban heat island” effect.

Sloped Roofs

Thanks to Hydrotech’s Garden Roof® Assembly for Sloped Applications, architects are no longer limited to designing for flat green roof applications. Hydrotech’s Garden Roof® Assembly can be applied to sloping roofs with a pitch of 2:12 and greater using special engineering to accommodate sheer forces, and ensure soil and plant retention. For roof slopes greater than 3:12 pitch, the GardenNet® soil confinement system must be utilized.


A Garden Roof® Assembly can expand the livable space of a building through 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.


The landscape possibilities with an Intensive Garden Roof® Assembly are virtually limitless. Intended for recreational, sporting, and leisure purposes they are often indistinguishable from natural gardens in appearance. It is not uncommon to see water features, significant topography changes, trees and other large plantings that add character and interest to the roof.

Plazas and Promenades

A plaza finished with architectural pavers can greatly improve the look of a building exterior. As these areas often enclose occupied space or parking, waterproofing in critical.  This is why Ultimate Assembly has been installed on thousands of plazas nationwide.


Replacing old plaza surfaces is a task no owner or developer looks forward to, so when the time does arrive, few care to risk a system with a short or inconvenient performance record. The Ultimate Assembly® removes that element of mystery with time tested MM6125® waterproofing, insulation and drainage (both optional), topped with exceptionally durable architectural pavers and warranted by American Hydrotech Inc. Also the open joint configuration of the Ultimate Assembly make construction and maintenance incredibly simple.

Roofs and Terraces

Very few roofing assemblies can match the quality and integrity of the Ultimate Assembly®. The roof is well protected since the layers above the MM6125® waterproofing act as a shield against UV rays and harsh weather. With architectural pavers as the finished surface, the design process gains creative flexibility, while the structure benefits from a high performance overburden.

Waterproofing Horizontal Applications

Plazas, parking decks, tunnels, bridges and mud slabs.

Waterproofing Vertical Applications

Foundation wall waterproofing and planters.

Recent Press

  • April 3, 2017
    Wind data is a critical issue to consider when building a new structure. An increase in the number of green roofs on buildings has driven a need for new wind design standards to be written for vegetative roofing assemblies. Richard Hayden discusses...
  • September 27, 2016
    (September 28, 2016) Washington State has always been considered a pioneer when it comes to the adoption of greener and more sustainable practices. One of the most sustainable practices is to reuse an already constructed building and enhance that...
  • July 16, 2016
    (July 16, 2016) Excerpt from an article in Forester Daily News Green roofs – also known as vegetated or garden roofs – are key green infrastructure elements and are being increasingly recognized for their “valuable ability to absorb, reduce, and...
  • July 1, 2016
    CHICAGO, ILLINOIS (July 1, 2016) City Creek Center in downtown Salt Lake City, Utah, is one of the largest mixed-use urban developments built in the last 10 years. It's also one of the most innovative. Completed in 2012, the 23-acre project includes...

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