Protected Membrane Roofing Ballast Options & Flexibility

Ballast Options and Flexibility

One of the advantages of using MM6125® in a Protected Membrane Roof Assembly (PMR) is that once the membrane is installed owners and designers can take advantage of various ballast options (gravel, pavers and Garden Roof®) to suit a specific project’s needs. In fact, since MM6125 is keeping the structure watertight and monolithically applied directly to the deck, design professionals can combine ballast/assemblies with confidence knowing that drainage will occur at the deck level regardless of the transition between assemblies (i.e. gravel at the perimeter transitioning to a paver walkway that is separated from a vegetated space by a rock curb).

STONE BALLAST

Typically requires crushed, graded stone placed over a stone filter sheet, rolled out over the insulation. In the field of the roof, a minimum of 10 lbs./s.f. ballast is required, with 20 lbs./s.f. needed at perimeters and at large penetrations.   

Contact Hydrotech for specific installation guidelines.

BALLAST PAVERS

Ideal for installations where greater wind resistance is required (at building corners, perimeters or the whole roof) or when roof top traffic requires a more durable and walkable surface. 

Contact Hydrotech for specific installation guidelines.              

HYDROTECH'S HYDROGUARD

A lightweight alternative to the typical ballasted PMR Assembly is Hydrotech's Hydroguard® product. Hydroguard consists of Dow STYROFOAM® Insulation with a 3/8" latex modified cementitious layer that provides the necessary ballast, weighing only 4.5 LB/SF. Hydroguard Heavy is also available and consists of a 15/16” latex modified cementitious layer weighing 11 LB./SF. Click here for more information on Hydroguard.

Contact Hydrotech for specific installation guidelines.     

HYDROTECH'S ULTIMATE ASSEMBLY®

An esthetic and practical solution for the roof deck that is to be used as a terrace. Hydrotech provides the entire assembly from the MM6125 roof membrane to the architectural paver. Numerous paver sizes, colors and finishes are available. 

HYDROTECH'S GARDEN ROOF® ASSEMBLY

Hydrotech's Garden Roof Assembly takes the PMR roof to the next logical level - a vegetated roof. Reducing the urban heat island effect as well as a solution for stormwater management are only two benefits (of many) this assembly provides. This is sustainable, responsible architecture whose time is here.  

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...
  • October 20, 2016
    (November 15, 2016) Richard Hayden, Hydrotech's Garden Roof Department Manager, will be speaking at the 2016 LED Specifier Summit and High Performance Building Forum. The design community continues to struggles with how to handle ever-increasing...
  • September 24, 2015
    (August 5, 2016) Excerpt from an article in Stormwater Magazine . With their myriad benefits, green roofs are becoming increasingly incorporated into new and existing projects. The International Green Roofs and Walls Project Database lists 1,599...
  • 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...
  • July 2, 2014
    American Hydrotech Inc. has released a free, interactive digital version of the company's popular Garden Roof® Planning Guide. The app – unveiled last week at the AIA Expo in Chicago – features pinch-to-zoom product photography, video animations, photo galleries showing Garden Roof® Assemblies in real-world applications, and design considerations.

Upcoming Events

    October 21, 2017 to October 22, 2017

    ASLA 2017 Annual Meeting and EXPO

    Los Angeles CA Event Details
    November 8, 2017 to November 9, 2017

    USGBC 2017 International Conference and Expo

    Boston Convention & Exhibition Center – Boston MA Event Details