Hydrotech's Monolithic Membrane 6125 (MM6125®) is installed at 2-3 times the thickness of many other liquid applied waterproofing membranes. The greater thickness of MM6125 allows for a wider variety of substrate conditions, increases its crack bridging capability and enhances its self-healing properties.

MM6125 is typically installed as either a Fabric Reinforced or Standard installation. A description of each installation method and a membrane selection chart follows...

Monolithic Membrane 6125 Fabric Reinforced Assembly...

The Monolithic Membrane 6125 Fabric Reinforced Assembly consists of one coat of membrane at 90 mils (2.3 mm) into which Hydrotech's Flex Flash F (a spunbonded polyester fabric) is embedded. A second coat of membrane is then installed at 125 mils (3.2 mm) minimum. Total membrane thickness is 215 mils (5.5 mm).

The Fabric Reinforced Assembly method of installation is typically used for poured-in-place and precast concrete substrates in "renovation/rehabilitation" work. It is also used for poured-in-place concrete substrates in "new construction" when a belt and suspenders approach may be desired. In addition, the Fabric Reinforced Assembly is used on plywood, wood plank and an approved cementitious board, over a metal deck substrate. (SEE CHART BELOW.)

Monolithic Membrane 6125 Standard Assembly...

The Monolithic Membrane 6125 Standard Assembly consists of one coat of membrane at a thickness of 180 mils (4.6 mm), minimum 125 mils (3.2 mm).

The Standard Assembly method of installation is typically used for poured-in-place and precast concrete substrates in "new" construction. (SEE CHART BELOW.)

Membrane Assembly Selection Chart...

Membrane Assembly and Acceptable Deck Chart

Substrate Type

Standard Assembly

Fabric Reinforced Assembly

Cast in-place concrete (wood troweled finish preferred)

(minimum density of 115 pcf)



Composite deck (concrete over metal)



Precast concrete: "T", Double "T", panel



Lightweight insulating concrete or cellular concrete



Wood Plank






Metal deck with gypsum board (or other acceptable cover board)






Separation/Protection Course...

On a horizontal installation a separation/protection course such as Hydrotech's Hydroflex 10 or Hydroflex 30 is embedded into the membrane while it is still warm and tacky, to provide protection from foot traffic and moderate physical abuse. On vertical installations a protection layer such as Dow STYROFOAM® Insulation board, Thermaflo® or other approved protection may be used.

Recent Press

  • 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...
  • May 21, 2018
    American Hydrotech, a recognized leader in the development and distribution of premium waterproofing and roofing assemblies, today announced the availability of their Protected Membrane Roof (PMR) Planning Guide , a unique, new resource representing...
  • 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...
  • February 1, 2018
    CHICAGO, ILLINOIS (February 1, 2018) The Chicago Blackhawks have captured the hearts of the city of Chicago along with three Stanley Cups in the last decade. The Blackhawks routinely lead the league in attendance at the United Center, and fans were...

Upcoming Events

  • November 8, 2019 to November 9, 2019

    2019 Arc US - BOND Event

    The Diplomat Beach Resort – Hollywood FL Event Details
  • November 16, 2019 to November 17, 2019

    2019 ASLA Annual Meeting and Expo

    San Diego Convention Center – San Diego CA Event Details
  • November 20, 2019 to November 21, 2019

    2019 USGBC International Expo and Conference

    Georgia World Congress Center – Atlanta GA Event Details
  • March 28, 2020 to March 29, 2020

    2020 RCI International Convention & Trade Show

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