For roofs, balconies, and internal wet areas requiring a highly flexible barrier, Duram 195 is a single-pack, moisture-curing polyurethane membrane that cures to form a seamless, Class III elastomeric barrier. Tested to AS 4654.1 for external above-ground use, it accommodates structural movement across concrete, cementitious screeds, and lightweight sheeting without cracking or losing adhesion.
Duram 195 uses a self-leveling, moisture-curing polyurethane chemistry that bonds directly to primed substrates, eliminating the risks of joints, seams, or laps. Unlike conventional aromatic polyurethanes, it incorporates UV stabilisers, UV absorbers, and antioxidants to provide enhanced stability during the construction phase. Because the formulation is completely bitumen and tar-free, it will not stain grout or tiles when covered. The cured membrane also inhibits mould and biological growth, protecting covered internal wet areas from under-tile degradation.
Duram 195 is suitable for above and below-ground applications on clean, sound, and dry substrates including concrete, cementitious screeds, masonry, and lightweight composite sheeting. On exposed roofs, decks, terraces, balconies, podiums, and gutters, it must be top-coated with Duram Multithane ATC to prevent UV degradation. In tiled or covered wet areas, it provides long-term waterproofing under screeds and finishes.
Cementitious substrates must be cured to a minimum compressive strength of 20MPa. Substrate moisture must measure below 75% RH via in-situ probe testing (ASTM F2170) or below 4.5% via non-destructive comparative testing (ASTM F2659). Slab-on-grade elements require an effective damp-proof membrane underneath. All laitance must be removed via shot blasting, sandblasting, or grinding to achieve a clean profile.
Lightweight sheeting must be dry, clean, and installed to the manufacturer's structural recommendations with all sheet edges supported on framing. Cut edges must be treated to maintain water resistance, and sheet joints must be detailed using Perm-a-fab, Duram Leak-Seal Tape, or a DualFlex Bandage.
Surfaces should be primed with Duram Primeseal MC at a rate of no less than 1 Litre per 4m² (or Duram Primeseal SP at 1 Litre per 7m²) and allowed to dry. If there is a risk of entrapped substrate moisture causing outgassing, apply two coats of Duram Primeseal MC. For metal surfaces, abrade to meet AS 1627.4 Class 2.5 and prime with Duram ME Primer.
For internal wet areas, install joints, fillets, and bond breakers in accordance with AS 3740 using a 12mm bead of compatible sealant. For external above-ground applications, install fillets in accordance with AS 4654.2 using a 15mm x 15mm bead of compatible sealant, and chamfer all external corners.
Treat non-structural static cracks under 1.6mm wide with a 150mm wide detail coat of Duram 195. Cracks wider than 1.6mm and construction joints must be ground out to a minimum width of 6mm, filled with a compatible sealant over a backing rod or bond-breaker tape to maintain a 1:1 width-to-depth ratio, and then treated with a 150mm wide detail coat of membrane before full application.
Apply the membrane by brush, roller, broom, or squeegee in a minimum of two coats. Apply the second coat within 36 hours of the first to ensure strong inter-coat adhesion without repriming. If dilution is necessary due to site temperature or viscosity, thin only with Duram Solvent up to a maximum of 1 Litre per 15 Litre pail. Do not use alternative solvents, as they will cause curing failure, slow drying, gassing, or gelling.
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.
