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When a waterproofing failure isn't an option, a robust, elastomeric membrane gives long-term peace of mind. Duram 195 delivers seamless, Class III waterproofing that handles movement and remains intact under screeds, tiles, or in below-ground conditions. It ensures a continuous barrier, preventing costly callbacks and structural issues from moisture ingress.
Duram 195 is a single-pack, moisture-curing polyurethane membrane engineered for high-performance waterproofing. It forms a tough, seamless Class III elastomeric barrier, primarily designed for areas not exposed to direct UV light. Integrated UV stabilizers, absorbers, and antioxidants offer enhanced durability compared to conventional aromatic polyurethanes. This formulation provides a flexible solution for both above and below-ground applications, preventing issues like re-emulsification, blistering, or cracking that plague lesser membranes.
Duram 195 applies easily as a single-pack, self-leveling liquid, eliminating the need for on-site mixing. It can be applied by brush, roller, broom, or squeegee, with subsequent coats typically applied a day apart. The surface must be clean, sound, and completely dry before application. Moisture content in cementitious substrates requires testing, with less than 75% RH (ASTM F2170) or 4.5% (ASTM F2659) being critical for proper adhesion and to prevent bubbling.
Duram 195 functions as the primary waterproofing layer in a multi-component system. It is applied after comprehensive substrate preparation, which includes cleaning, laitance removal, and critical moisture testing. Priming with compatible Duram primers is essential for adhesion. For crack and joint treatment, it integrates with detailing solutions such as backer rod and compatible sealants for non-structural cracks, or proprietary systems like Perm-a-fab, Duram Leak-Seal Tape, or DualFlex Bandage for sheet joints.
Once cured, Duram 195 is typically covered. In internal wet areas, an unbonded screed usually follows. For exposed external applications like roofs and decks, Duram Multithane ATC is applied as a UV-stable topcoat. For planters and below-ground structures, protection layers like drainage cell and geofabric are installed to shield the membrane from damage.
No, Duram 195 is designed for non-UV exposed applications. For exposed areas like roofs or balconies, it must be top-coated with Duram Multithane ATC to prevent degradation from direct sunlight.
Direct tile adhesion is not advised. For under-tile applications, an unbonded screed is typically required. Consult Tremco CPG for project-specific advice on bonded or direct stick tile systems.
Applying Duram 195 to damp or even slightly damp surfaces will cause gassing and bubbling of the membrane, or prevent it from adhering correctly. The surface must be completely dry before application to ensure proper adhesion and cure.
Yes, Duram 195 meets the criteria of AS 4654.1 2012 as a Class III elastomeric waterproofing membrane. This compliance confirms its suitability for external above-ground waterproofing systems when properly installed and protected.
| Application | Key benefit | Primary trades |
|---|---|---|
| Waterproofing under tiles and screeds | Forms a seamless, elastomeric (Class III, 400% elongation) barrier that does not re-emulsify, preventing water ingress and tile staining. | Waterproofers, Tilers, Builders |
| Waterproofing for protected external areas (e.g., under planter boxes, ballast) | Provides long-term, crack-bridging protection, tested to AS 4654.1, inhibiting mould and biological growth in hidden environments. | Landscape architects, Builders, Waterproofers |
| Waterproofing for roofs, decks, and balconies when top-coated | Forms part of a system (with Multithane ATC) that delivers ultimate long-term waterproofing, combining flexibility and UV stability for exposed scenarios. | Roofers, Builders, Waterproofers |
| Wet area floors and upturns | Low VOC formulation compliant with Green Star ratings ensures a compliant and durable waterproof layer in internal wet areas. | Waterproofers, Tilers |
Ensure substrates are sound, dry and clean. Repair blowholes/defects with Resiflex FC; allow to cure. Rebate wastes and seal perimeters.
If moisture risk exists, specify two coats of Primeseal MC before membrane to prevent gassing.
Seal cracks/joints with Resiflex FC; reinforce with Leak-Seal Tape where live movement is expected.
Apply by brush, roller, broom or squeegee in two coats to achieve target DFT.
~1.5 L/m² total; aim for ~1.5 mm DFT (each coat ~0.5 mm dry).
Typically ~1.0 mm DFT (as specified); water-resistant non-tanking walls minimum ~0.75 L/m² at ~0.5 mm DFT.
In exposed exterior areas, over-coat Duram 195 with Multithane ATC (~3–4 m²/L). For tiling, top with sand/cement screed and provide joints to AS 3958.1.
Roofs/podiums: protection sheeting, geotextile/drainage cell before ballast/pebbles. Ground works: protection and drainage layers before backfill.
Only with Duram Solvent, max ~1 L per 15 L pail; consult technical advice. Do not use alternative solvents.
Danger: This product is a combustible liquid and a hazardous chemical. It may cause skin and serious eye irritation, allergic skin reactions, or respiratory symptoms if inhaled. It is suspected of causing cancer, damaging fertility, and the unborn child. Harmful to aquatic life with long-lasting effects. Obtain special instructions before use.
Wear protective gloves, protective clothing, safety glasses with side shields or chemical goggles, and face protection. In situations where ventilation is inadequate or exposure risk is high, wear approved respiratory protection, such as an air-line respirator or SCBA. Contaminated work clothing should not be allowed out of the workplace.
Use only outdoors or in a well-ventilated area. Ensure good occupational work practice in the application area. Prevent concentration in hollows and sumps.
Store locked up, in original containers, in a cool, dry, well-ventilated area away from incompatible materials and foodstuff containers. Keep containers securely sealed, away from ignition sources. Dispose of contents/container to an authorised hazardous waste collection point in accordance with local regulations. Do not allow wash water from equipment to enter drains.
Proper surface preparation and priming are critical for Duram 195 to achieve its specified adhesion and long-term performance.
Surface prep: Substrate must be cured to at least 20 MPa compressive strength. Clean the surface thoroughly, ensuring it is free of laitance, mould, paint, sealers, and contaminants. Shot blasting is the preferred method for laitance removal. Remove protrusions and fill voids greater than 5 mm. For trafficked membranes, prepare to CSP 3 (ICRI 03732).
Primer: Required. Surface moisture content must be dry; less than 75% RH (ASTM F2170) or less than 4.5% (ASTM F2659). Prime with Duram Primeseal MC at 1 Lt per 4 m², or Duram Primeseal SP at 1 Lt per 7 m². If entrapped moisture is a risk, apply two coats of Duram Primeseal MC. Allow primers to touch dry.
Surface prep: Ensure the sheeting is dry, clean, smooth, firm, and free of all release agents, dust, and projections. Sheeting must be installed per manufacturer's recommendations with supported edges and correct fixings. Treat all sheet joints with an approved compound and detail with Perm-a-fab, Duram Leak-Seal Tape, or DualFlex Bandage. Cut edges must be treated to maintain water resistance.
Primer: Required. Conduct substrate-specific moisture testing to confirm dryness. Consult Tremco CPG for advice on pre-applied film-forming coatings.
Surface prep: For small detailing areas like pipe penetrations or hobs. Mechanically abrade metal surfaces to AS 1627.4, class 2.5 ('Near White Metal'). Mechanically abrade plastic surfaces to create a profile. Clean all non-porous substrates with an IPA wipe, ensuring residual solvent flashes off.
Primer: Required. For metal, apply Duram ME Primer. If rusted, treat with a rust converter first. Project-specific adhesion testing is recommended, especially for galvanised substrates or large areas.
| Property | Value |
|---|---|
| Abrasion Resistance | N/A - Non-exposed |
| Bond Strength (Average peel strength) | 141 N Concrete masonry, 122 N Plywood |
| Cyclic Movement | Pass |
| Dimensional Stability | N/A - Liquid membrane |
| Elongation at Break | 400% (Class III) |
| Tensile Strength | 1.04 MPa |
| Heat Ageing | Pass (450% Elongation after ageing) |
| Temperature Resistance | Pass |
| Durability | Pass (AS4654.1 Table A4) |
| Water Vapour Transmission Rate | 9.90 g/m²/24 hours |
| VOC | <100 g/L |
| Flashpoint | 75 °C |
| Relative Density (Water = 1) | 1.39 |
| Boiling Point | 160 °C |
| Appearance | Dark brown to black liquid |
| Touch Dry | 4-6 hours (25°C, 50% RH) |
| Recoat | 6-24 hours (25°C, 50% RH) |
| Full Cure | 48 hours (25°C, 50% RH) |
| Shelf Life | 6 months |
Here are some common examples on where Duram 195 used by our customers.
