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

  • November 26, 2019
    Palo Alto, CA. (November 26, 2019) There are many reasons to incorporate a green or living roof into a design, including energy conservation, water management, and financial benefits. For one project in Palo Alto, California, the benefits of having...
  • November 14, 2019
    WASHINGTON, D.C. (November 14, 2019) The Kennedy Center’s first expansion since its opening in 1971, the REACH is the John F. Kennedy Center for the Performing Arts’ historic, $250 million expansion project. A living memorial for President John F...
  • May 2, 2019
    CHICAGO, ILLINOIS (May 2, 2019) Very near Lake Michigan in Chicago, Northwestern Medical Center faced several challenges in bringing a new campus building to life. Designed by Perkins+Will, the project involves a phased construction where a 14-story...
  • January 25, 2019
    CHICAGO, ILLINOIS (January 25, 2019) The Ace Hotel is located in Chicago’s Fulton Market Historic District. It features 159 guestrooms and amenities including rooftop event spaces with stunning views of the city. The complex features several...
  • October 18, 2018
    American Hydrotech, a recognized leader in the vegetative roofing market, today announced the availability of the Fourth Edition of the company’s widely acclaimed Garden Roof® Planning Guide. For the last five years, updated print, online and app...
  • August 28, 2018
    Over the last two decades, the roofing industry has undergone some major changes, one of which is a growing recognition of the value of roof space other than keeping occupants warm and dry. Two veteran roofing professionals share their thoughts on...

Upcoming Events

March 28, 2020 to March 29, 2020

2020 RCI International Convention & Trade Show

Marriott Marquis Houston & George R. Brown Convention Center – Houston TX