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Vulkem Non Exposed Membrane:  


Vulkem Non Exposed Membrane - One part polyurethane waterproofing membrane


Key benefits summary


Permanently flexible 600%

Meets requirements of AS3740-2004

Fast curing

Compatible with Metz and RLA tile adhesives

High strength and puncture resistant

Vertical and horizontal applications

Easy to apply

Resistant to range of chemicals and pollutants




Vulkem Non-Exposed is a single pack elastomeric, moisture curing, high tensile strength and tough curing polyurethane membrane. It cures to form a flexible rubber membrane. Vulkem Non-Exposed Membrane may be used to apply a

seamless, monolithic waterproof membrane to concrete substrates, compressed sheeting plywood which is well anchored and primed. Simple and easy to apply by either notched trowel, roller or brush.




Wet Area

Laundries, showers

Roof terraces




Concrete Substrate Plazas

Sandwich membrane


Colour: Grey


Pack size product code


19 Litre Pail 215110

600ml sausages 215111


Typical physical properties:



Test Method



ASTM D-412



ASTM D-412


Hardness (Shore A)

ASTM C-661


Peel Strength

ASTM C-794




0.12metric perms




Wet Material Properties





Viscosity, cps

Brookfield HBT


Cure Time

ASTM D-1640

48 hours max@25°C-50% RH

Flash point




NOTE: Typical Properties should not be used as Specifications.


Usage guidelines


One part urethane, Vulkem Non-Exposed Membrane bonds firmly to clean, dry concrete and well anchored wood substrates. It retains its integrity even if the substrate movement causes hairline cracks up to 1.5mm. It cut or damaged,

Vulkem Non-Exposed Membrane will prevent water migration between its substrate. Vulkem Non-Exposed Membrane can be finished after a 48 - 72 hour cure at temperatures over 15.6 C.


Substrate preparation


Concrete should be cured for 28 days. Remove all dirt, dust, plaster, cement

droppings, protrusions, oils and other contaminants. Fill screw holes.


To the wall/floor junctions and the floor/hob, hob/wall joints within the shower tray, apply fillet bead of Polyurethane Sealant as a bond breaker. Apply sealant around floor penetrations, tap and shower rose and other discontinuities Floor wastes in concrete shall be cut level with the floor. For

sheet flooring, leak control flanges shall be fitted and fully sealed.


Cracks: non movement and hairline cracks may be filled with a brush coat of Vulkem Non-Exposed Membrane. Movement cracks to be routed out, cleaned and filled with Polyurethane Sealant




All wood surfaces are to be primed using Vulkem Primer 171

All metal surfaces are to be primed using by TREMprime Non-Porous Primer (Vulkem Primer 181)

Existing polyurethane membrane surfaces are to be primed using Vulkem Primer 191


Method of application


Mix the Vulkem Non-Exposed Membrane to ensure no settlement of the material is in the bottom of the pail and the colour of the material is consistent with no

streaks or striations


All internal wet areas should be waterproofed to meet AS 3740-2004 requirements


Apply one coat of Vulkem Non-exposed Membrane at specified coverage rates using either brush, roller or squeegee


Ensure the membrane is turned down into the floor waste or well sealed around the leak control flange and other penetrations. Ensure flashing angles are properly sealed across doorways. Check for pin holes in the membrane when dry and rectify.


A light broadcast of sand into the Vulkem Non-Exposed Membrane, while still wet will ensure good bond with tile Adhesive




Approximately 1.2L/m2 at a dry film thickness of 1mm (approximately 16m2 per 18.9L pail to achieve the waterproof requirements as stated in AS 3740-2004.


Approximately 0.6L/m2 at a dry film thickness of 0.5mm (approximately 32m2 per 18.9L pail) to achieve water resistant requirements as stated in AS 3740-2004 (vertical applications)


Clean Up


Thoroughly clean tools with Tremco IPA Cleaner before handling. Clean hands with Tremco Tub O’ Towels or soapy water.


Waterproofing FAQ

Membrane Protection Board

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Waterproof Drainage Sheet

Waterproofing Primer

Repair and Maintenance