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Duram 195: A Technical Overview
Duram 195 is a single-pack, liquid-applied, moisture-curing polyurethane membrane that cures to a tough, seamless, elastomeric film. It’s engineered for long-term waterproofing in non-UV-exposed applications and can be used externally when top-coated with Multithane ATC. The formulation (low VOC, bitumen-free) resists re-emulsification, provides excellent chemical and hydrostatic resistance, and is suitable for permanent immersion scenarios. It bonds to a wide array of suitably primed substrates and achieves Class III extensibility for reliable crack accommodation.
For Australian external above-ground use, Duram 195 meets AS 4654.1:2012 (when exposed areas are protected with Multithane ATC) and aligns with Green Star environmental criteria. Typical dry film builds are 1.5 mm DFT on floors/tanking and ~1.0 mm DFT on verticals, applied in two coats at prescribed coverage rates.
>360%
Class III extensibility for dynamic movement
Core Features & Specifications
- Single-pack, no mixing — fast setup and fewer site variables.
- Self-levelling, seamless film — no laps or joints to fail.
- Class III flexibility (>360% elongation) — accommodates movement without cracking.
- Low VOC and bitumen-free — won’t stain tiles or grout.
- Rapid cure — touch dry ~4–6 h; recoat 6–24 h; full cure ~48 h+ (conditions dependent).
- Excellent chemical & hydrostatic resistance — suitable for immersion and demanding environments.
- High puncture strength — durable under toppings and protection systems.
- Broad substrate compatibility with correct primer — concrete, masonry, FC/CFC, metals, timber sheets, tiles, acrylic coatings, and more.
- External compliance — meets AS 4654.1 for above-ground exterior (when top-coated with Multithane ATC).
The Duram 195 Advantage
- Seamless reliability — continuous film reduces leak paths and callbacks.
- System flexibility — compatible primers and Multithane ATC topcoat for UV exposure scenarios.
- On-site efficiency — single-pack, roller/squeegee application keeps jobs moving.
- Long-term performance — resists re-emulsification and biological growth for durable service life.
Proactive Troubleshooting
Scenario: Applied to damp or slightly damp substrate
Potential Outcome: Gassing/bubbling, poor adhesion, and film defects that compromise waterproofing.
Adheseal Best Practice: Verify substrate dryness. Where entrapped moisture is possible, prime with two coats of Primeseal MC and re-test before membrane application.
Scenario: External exposure without UV topcoat
Potential Outcome: Aromatic PU slowly degrades under UV, reducing service life.
Adheseal Best Practice: In exposed areas, overcoat with Multithane ATC after Duram 195 cures to ensure UV stability and long-term durability.
Applications in Practice: Trade Scenarios
For Waterproofers (Specifier/Architect): Balcony & Terrace Systems
The Professional's Challenge
Conforming to AS 4654.1 above-ground waterproofing while managing movement and UV exposure on trafficked podiums and balconies.
The Adheseal Solution
Prime per substrate; apply Duram 195 to 1.5 mm DFT (floors). In exposed areas, specify Multithane ATC. For tiling, top with screed and install movement joints to AS 3958.1.
Best Practice Note
Detail corners and joints with Resiflex FC and, where needed, Leak-Seal Tape before field coats to control stress and prevent failures.
For Tilers (On-site Applicator): Wet Areas & Upturns
The Professional's Challenge
Delivering a robust Class III membrane under screeds and tiles without staining or re-emulsification.
The Adheseal Solution
Prime appropriately (e.g., Primeseal MC/SP); apply two coats to achieve ~1.5 mm DFT on floors. Top with sand/cement screed; use movement joints as per AS 3958.1.
Best Practice Note
Observe recoat windows (6–24 h). If exceeded, re-prime to maintain inter-coat adhesion before proceeding.
For Remedial Contractors (Business Owner/Operator): Planters & Retaining Walls
The Professional's Challenge
Managing hydrostatic pressure and protecting the membrane during backfilling and landscaping.
The Adheseal Solution
Achieve specified DFT with Duram 195; protect with geotextile/drainage cell before clean fill. Use Primeseal MC where moisture risk exists to prevent gassing.
Best Practice Note
Rebate wastes and seal perimeters with Resiflex FC; incorporate Leak-Seal Tape over live cracks and joints before field coats.
Frequently Asked Questions
Can Duram 195 be used in exposed exterior areas?
Yes, with a topcoat. Duram 195 must be over-coated with Multithane ATC for UV exposure. Without the aliphatic topcoat, the aromatic PU will slowly degrade in sunlight, reducing service life.
What thickness and coverage should I allow for?
Floors/tanking typically require ~1.5 mm DFT (two coats at ~0.75 L/m² per coat; total ~1.5 L/m²). Vertical surfaces are typically ~1.0 mm DFT. Always verify coverage against substrate porosity and site conditions.
Can I tile directly over Duram 195?
Direct tile adhesion is not advised. Best practice is to top with a sand/cement screed (with appropriate bonding agents if required) and provide movement joints in accordance with AS 3958.1.
What are the typical cure times?
Indicative guide: Touch dry ~4–6 h, recoat 6–24 h, and full cure ~48 h+. Conditions such as temperature, humidity, substrate and ventilation will affect actual times.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Wet areas (floors & upturns) | Seamless Class III film under screeds/tiles; no re-emulsification | Tilers, Waterproofers |
| Balconies, decks, terraces, podiums | AS 4654.1 compliance when top-coated; durable movement accommodation | Waterproofers, Builders |
| Planters, retaining walls, landscaped areas | Hydrostatic resistance; robust under protection/drainage layers | Remedial, Waterproofers |
| Pits, bunding, water-retaining structures | Suitable for immersion; chemical resistance for demanding sites | Remedial, Asset Maintenance |
| Roofs & gutters (with ATC topcoat) | UV-stable system using aliphatic Multithane ATC over Duram 195 | Waterproofers, Builders |
Applying Duram 195: Enhanced Protocols & Best Practices
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Surface Preparation
Ensure substrates are sound, dry and clean. Repair blowholes/defects with Resiflex FC; allow to cure. Rebate wastes and seal perimeters.
Moisture Control
If moisture risk exists, specify two coats of Primeseal MC before membrane to prevent gassing.
Joint Detailing
Seal cracks/joints with Resiflex FC; reinforce with Leak-Seal Tape where live movement is expected.
Timing: Proceed only once primers are dry per their TDS.Pro Tip: Freedom from surface water and continual dampness is essential for film integrity. -
Membrane Application
Apply by brush, roller, broom or squeegee in two coats to achieve target DFT.
Floors/Tanking
~1.5 L/m² total; aim for ~1.5 mm DFT (each coat ~0.5 mm dry).
Verticals/Non-tanking walls
Typically ~1.0 mm DFT (as specified); water-resistant non-tanking walls minimum ~0.75 L/m² at ~0.5 mm DFT.
Timing: Touch dry ~4–6 h; recoat 6–24 h; full cure ~48 h+ (environment dependent).Pro Tip: Apply the second coat within 36 h for optimal inter-coat bond. If exceeded, re-prime. -
Top-Coating & Coverings
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.
Protection Layers
Roofs/podiums: protection sheeting, geotextile/drainage cell before ballast/pebbles. Ground works: protection and drainage layers before backfill.
Solvent Thinning (If Needed)
Only with Duram Solvent, max ~1 L per 15 L pail; consult technical advice. Do not use alternative solvents.
Timing: Allow Duram 195 to cure before top-coating or covering.Pro Tip: Monitor for bubbling/pin-holing in warm, dry conditions; lightly over-roll wet membrane if needed.
Limitations & Safety
Product Limitations
Not designed for long-term direct UV exposure without an aliphatic topcoat (use Multithane ATC).
Not a trafficable membrane (occasional construction foot traffic only).
Do not apply to damp/slightly damp substrates — risk of gassing/bubbling and poor adhesion.
Not suitable for prolonged contact with chlorine concentrations >10 ppm.
Direct tile adhesion is not advised; use a screed/topping system.
Safety & Handling Requirements
Personal Protective Equipment
Wear chemical-resistant gloves, eye protection and suitable protective clothing. Avoid skin and eye contact with uncured product.
Ventilation Requirements
Use in well-ventilated areas. Manage vapours appropriately, especially indoors or in confined spaces.
Fire & Handling Precautions
Solvent-based and combustible when uncured. Keep away from ignition sources. Store cool and dry, away from heat and flames.
Emergency First Aid
Eyes:
Rinse cautiously with water for several minutes; remove contact lenses if present and easy to do; continue rinsing and seek medical advice.
Skin:
Wipe excess and wash with soap and water. Do not use solvents on skin.
Inhaled:
Move to fresh air and rest. Seek medical attention if symptoms persist.
Swallowed:
Rinse mouth. Do not induce vomiting. Seek medical attention immediately.
Seek medical attention immediately in all cases of serious exposure.
Duram 195 Application Guide
Concrete / Cementitious Surfaces
Surface Preparation
Ensure sound, dry, clean and free from laitance, dust, curing compounds and contaminants. Rectify blowholes/defects with Resiflex FC or non-shrink mortar; allow to cure.
Primer Requirements
Primer required/recommended
Use Primeseal MC (risk of moisture) or Primeseal SP per TDS. Two coats of Primeseal MC where entrapped moisture is possible.
Duram Primeseal MC / Primeseal SPFC/CFC Sheeting & Masonry
Surface Preparation
Clean and dry. Treat joints: seal with Resiflex FC; reinforce live cracks/joints with Leak-Seal Tape before field coats.
Primer Requirements
Primer required/recommended
Prime per TDS. Additional priming may be required on porous or dusty substrates.
Duram Primeseal MC / Primeseal SPMetal (Prepared)
Surface Preparation
Remove rust and contaminants; apply rust converter if required before priming.
Primer Requirements
Primer required
Use ME Primer; alternative Primeseal MC where specified.
Duram ME Primer / Primeseal MCTimber Sheets / Plywood / Particleboard
Surface Preparation
Clean, dry and secure. Butter edges or seal joints with Resiflex FC; allow to cure. Reinforce with Leak-Seal Tape where movement is expected.
Primer Requirements
Primer required
Prime with Primeseal MC (timber/ply/particleboard) per TDS before membrane application.
Duram Primeseal MCPlastics & Angles (e.g., wastes, water stops)
Surface Preparation
Rebate floor wastes; seal perimeters with Resiflex FC. Ensure components are securely fixed.
Primer Requirements
Primer recommended as applicable
Prime plastics with Superprime 711 where required. Some retrofitted flanges may not need priming—seek technical guidance.
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