Waterproofing Assemblies

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 Selection ChartShow

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.

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