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Use Silcor 560 HB for professional applications like: Ensuring AS 3740 & AS 4654 compliance for internal wet areas and external non-exposed membrane systems, waterproofing under screeds/tiles on balconies & decks, tanking retaining walls & planter boxes.
Silcor® 560 HB is an economical, high-performance, one-part liquid polyurethane waterproofing membrane specifically engineered for professional applications within the Australian construction industry. This high-build, high-solids formulation is certified as a Class III High Extensibility membrane compliant with AS 4654.1-2012 for external above-ground (non-exposed) use and AS/NZS 4858-2004 for internal wet area floors. Its moisture-curing nature forms a robust, seamless, and highly flexible membrane ideal for demanding applications where structural movement is anticipated. Designed for waterproofing contractors, builders, tilers, and specifiers requiring reliable, compliant solutions for balconies, decks, rooftops (under finishes), internal wet areas (bathrooms, laundries), planter boxes, and retaining walls.
Primer Information: Correct substrate priming is essential for system integrity. Use SILCOR® Primer BS for dry concrete (<5% moisture), masonry, CFC/CCS sheet, metals, PVC/ABS. Use EPOCOTE™ F100W (Clear or Grey) for green/damp concrete (up to 6.9% moisture), masonry, or where enhanced penetration is needed on porous substrates. For difficult metals (stainless steel, copper, aluminium), use Dow DOWSIL™ 1200 OS Primer after preparation. Always refer to the relevant Primer PDS for application rates and recoat windows. Ensure primer is pin-hole free before membrane application, especially on porous substrates prone to outgassing.
Cure Time & Working Parameters: Silcor 560 HB cures via reaction with atmospheric moisture. At 23°C and 60% RH, expect minimum recoat time of 12 hours, maximum recoat time of 48 hours, and readiness for flood testing or topping in 48 hours. It becomes rain resistant in approximately 2 hours. Lower temperatures and/or lower humidity will significantly extend cure times, while higher temperatures/humidity will accelerate them (refer to PDS table). Pot life is not applicable as it's a single-component system, but manage application within recoat windows.
Coverage Rate: Coverage depends on the specified Minimum Dry Film Thickness (DFT), typically ranging from 1.5mm to 2.0mm based on the project specification (consult GCP). A 22 kg pail will cover approximately 8.9 m² at 1.5mm DFT or 6.7 m² at 2.0mm DFT. Always verify required DFT and calculate WFT (Wet Film Thickness) needed (DFT / Solids Content % = WFT). Use a WFT gauge during application to ensure compliance.
Application Temperature & Humidity Range: Apply Silcor 560 HB when substrate and ambient temperatures are between 5°C and 35°C. Relative humidity must be between 35% and 85%. Crucially, the substrate temperature must be at least 3°C above the dew point to prevent condensation, which compromises adhesion. Avoid application in direct sun on hot days or when temperatures are rapidly rising to minimise substrate outgassing and potential pin-holing. Application when substrate temperature is stable or falling is recommended.
Chemical Properties & Resistance: Silcor 560 HB is a high-solids (91% w/w), moisture-curing polyurethane. It is certified to pass water, bleach, and detergent immersion tests according to AS 4858 / AS 4654.1 requirements. It is free from bitumen or tar. For resistance to specific chemicals beyond standard household types, consult GCP technical support.
Paintability & Finishability: Silcor 560 HB is not designed for exposed applications and must be permanently covered or protected. Therefore, paintability is not applicable. It is not typically sanded. A specific tie-coat system (Silcor 575 HB + aggregate) is required for bonded screeds, toppings, or tile adhesives – broadcasting aggregate directly onto Silcor 560 HB is unacceptable.
Key Features of Silcor 560 HB for the Professional
- Certified Class III Performance: Independently tested and certified to AS 4654.1-2012 and AS/NZS 4858-2004, ensuring compliance for external non-exposed and internal wet area waterproofing projects meeting NCC requirements.
- Exceptional Elongation (>700% / >1400%): Superior flexibility accommodates significant building movement and substrate cracking, vital for durability on balconies, podiums, and timber-framed wet areas.
- High Build Formulation: Allows application to the required DFT (e.g., 1.5mm - 2.0mm) efficiently, typically in two coats, even on vertical surfaces like retaining walls or upturns, reducing labour time compared to low-build membranes.
- One-Part Convenience: Ready to use from the pail after mixing. Eliminates potential on-site mixing errors associated with two-part systems and simplifies site logistics.
- Seamless & Fully Bonded: Creates a monolithic membrane without vulnerable seams or laps. Fully bonds to correctly primed substrates, preventing water tracking underneath the membrane.
- Wide Application Window: Tolerates a broad temperature (5°C-35°C) and humidity (35-85% RH) range, suitable for various Australian climatic conditions (within dew point constraints).
Why Choose Silcor 560 HB for Your Trade Needs:
- Ensure Compliant Installations: Meets critical Australian Standards (AS 4654.1, AS/NZS 4858, suitable for AS 3740 methods), reducing liability and ensuring sign-off for builders, waterproofers, and certifiers.
- Minimise Callbacks & Rectification Costs: The combination of high elongation, tensile strength (>3.0 / >5.0 MPa), and robust formulation delivers long-term waterproofing integrity, preventing costly leaks.
- Improve On-Site Efficiency: Simple one-part application, high build properties, and reasonable cure times contribute to faster project completion times for professional crews.
- Versatile Application Scope: A reliable solution for a wide range of common concealed waterproofing tasks in residential and commercial construction.
- Cold Applied Safety: Eliminates the fire risks and hazards associated with hot-applied or torch-on membrane systems.
When to Specify Silcor 560 HB for Optimal Results:
- Ideal for applications requiring high movement capability and AS compliance: Perfect for internal wet areas (bathrooms, showers, laundries), external balconies/decks/rooftops under screeds or tiles, planter boxes (with root barrier), and retaining walls/lift pits where concealment is guaranteed.
- Consider technical limitations for: Not suitable for any exposed applications (trafficable or non-trafficable) without appropriate protection (e.g., screed, tiles, ballast, specified top coat on turn-ups). Not suitable for negative hydrostatic pressure applications (e.g., inside basement walls). Strict adherence to substrate moisture content limits (<5% or <6.9% depending on primer) and application conditions (temp, humidity, dew point) is critical for success. Not for lining potable water tanks.
Trade-Specific Applications for Silcor 560 HB:
For Waterproofing Contractors:
- Install compliant Class III membrane systems for internal wet areas (AS 3740) and non-exposed external areas (AS 4654.2).
- Detailing internal corners (12x12mm sealant fillet), external corners (chamfer), penetrations, and drainage outlets correctly prior to membrane application.
- Achieve specified DFT using WFT gauge checks during application, typically in two cross-coats.
- Apply tie-coat system (Silcor 575 HB + aggregate) correctly when bonded finishes are specified.
For Builders & Project Managers:
- Specify and ensure installation meets AS 4654.1 / AS/NZS 4858 / AS 3740 requirements for waterproofing compliance under the NCC.
- Coordinate substrate preparation (concrete cure, strength, finish, cleanliness) and ensure readiness for primer application (moisture testing).
- Ensure correct protection (e.g., PROTECTOBOARD™, RAPID-DRAIN™, specified top coat) is installed over the cured membrane before subsequent trades commence work.
For Tilers:
- Waterproofing internal wet areas prior to screeding or direct tile bedding, ensuring AS 3740 compliance.
- Ensure correct tie-coat application (Silcor 575 HB + aggregate) is performed before applying cementitious tile adhesives for a durable bond. Verify adhesive manufacturer's compatibility.
- Protect membrane during tiling work.
Professional Application Guidelines
- Required Tools: Minimum 650W variable speed drill (<600 RPM) with 'Jiffy' style mixer, 10-14mm nap non-shedding rollers, brushes for detailing, WFT gauge, utility knife, cleaning solvent (xylene). Appropriate substrate preparation equipment (grinder, shot blaster, water blaster). Moisture meter.
- Trade Best Practices: Thoroughly mix pail before use. Ensure substrate is prepared per PDS (clean, dry, sound, profiled). Apply primer uniformly, ensuring no pinholes. Detail corners/joints/penetrations with Silcor LM PU Sealant (cure 12hrs min). Apply membrane in cross-directional coats, checking WFT to achieve specified DFT. Work within recoat windows. Protect from rain until sufficiently cured (min 2 hrs @ 23C/60RH).
- Troubleshooting Common Issues: Pinholes often caused by substrate outgassing (apply primer when temp stable/falling) or poor priming – re-prime affected areas. Slow cure usually due to low temp/humidity – allow longer cure times, ensure ventilation. Poor adhesion typically from contamination or incorrect priming – stop work, identify cause, rectify substrate/re-prime.
- Clean-up: Clean tools immediately with xylene solvent while material is wet. Cured material must be removed mechanically. Dispose of waste according to local regulations.
Storage and Shelf Life
- Storage Requirements: Store pails upright in original unopened packaging between 15°C and 25°C. Keep under cover, protected from moisture, frost, direct sunlight, and ignition sources. Site storage needs to consider these conditions, especially during hot Australian summers or cold winters.
- Shelf Life Information: 9 months from the date of manufacture when stored correctly. Check the pail for the expiry date before use. Do not use expired product. Rotate stock using FIFO (First-In, First-Out).
Certifications and Compliance
- **AS 4654.1-2012:** Compliant - Waterproofing membranes for external above-ground use (Class III High Extensibility).
- **AS/NZS 4858-2004:** Compliant - Wet area membranes (Class III High Extensibility).
- **AS 3740-2021:** Suitable for use as part of a compliant internal wet area waterproofing system when installed according to standard requirements.
- **NCC Compliance:** Meets the requirements for Class III membranes cited in the National Construction Code of Australia.
- **VOC Content:** <110 g/L (Low VOC).
Frequently Asked Questions
Q1: Does Silcor 560 HB meet the requirements for external balcony waterproofing under AS 4654?
A: Yes, Silcor 560 HB is certified Class III High Extensibility compliant to AS 4654.1-2012. However, it's crucial to remember this applies only to *non-exposed* applications. It must be covered by a screed and tile system, bedded pavers, ballast, or other approved protection. It cannot be left exposed to UV or traffic, except for turn-ups which require Silcor Top Coat 75.
Q2: Can I apply Silcor 560 HB directly to slightly damp concrete in a bathroom renovation?
A: Generally no. For concrete with moisture content <5.0%, use Silcor Primer BS or Epocote F100W Clear. If moisture is between 5.0% and 6.9% (tested with a calibrated meter), you MUST use Epocote F100W (Clear or Grey). Application onto substrates exceeding 6.9% moisture content or visibly damp/wet substrates is not permitted and can lead to adhesion failure or blistering.
Q3: Why do I need the Silcor 575 HB tie-coat for tiling over Silcor 560 HB? Can't I just broadcast sand into the 560 HB?
A: No, broadcasting aggregate directly into Silcor 560 HB is unacceptable. Silcor 560 HB is formulated for high flexibility, making it too soft to provide a durable mechanical key for tile adhesives. The specified tie-coat system (applying Silcor 575 HB membrane at 0.6mm WFT, then blinding with 0.5-1.0mm aggregate) creates a harder, properly keyed surface essential for reliable long-term adhesion of bonded screeds or tile adhesives.
Q4: What's the main cause of pinholes during application in summer conditions?
A: Pinholes are typically caused by substrate outgassing, especially common with porous concrete or masonry when the substrate temperature is increasing (e.g., morning sun). As the substrate heats, trapped air/moisture vapour expands and pushes through the wet membrane. To minimise this, prime and apply the membrane when the substrate temperature is stable or falling (e.g., later afternoon/evening in hot climates) and ensure the primer application is pinhole-free before coating.
Q5: Can Silcor 560 HB be used for waterproofing a planter box?
A: Yes, Silcor 560 HB is suitable for waterproofing planter boxes, provided it is protected from UV and physical damage (e.g., using PROTECTOBOARD™ or RAPID-DRAIN™). However, Silcor 560 HB itself does not have certified root resistance. If specified, a separate, certified root barrier protection layer must be installed over the cured Silcor 560 HB membrane before adding soil/planting media.
Q6: How critical is the 3°C dew point rule during application in humid environments like coastal QLD?
A: It's absolutely critical. If the substrate temperature is within 3°C of the dew point, condensation can form (even if not visible), preventing proper primer and membrane adhesion. This risk is higher in humid coastal areas or during cooler periods. Always measure both substrate temperature and ambient temp/humidity to calculate the dew point before application. If conditions aren't met, application must be delayed.
Use Silcor 560 HB for:
- Waterproofing internal wet areas (bathrooms, showers, laundries) to AS 3740 requirements prior to screeding or tiling.
- Waterproofing external non-exposed balconies, decks, and podiums under bonded screeds/tiles or pedestal paver systems (meeting AS 4654.1).
- Waterproofing non-exposed rooftops under ballast, insulation, drainage cells, or green roof systems.
- Tanking retaining walls and lift pits (positive side application).
- Waterproofing planter boxes (must be combined with a certified root barrier if required).
- Providing a seamless membrane under toppings or screeds in plant rooms or equipment areas (non-exposed).
- Remedial waterproofing projects where a Class III concealed membrane is specified.
Why Use Silcor 560 HB:
- Achieves compliance with key Australian Waterproofing Standards (AS 4654.1, AS/NZS 4858, suitable for AS 3740).
- Reduces project risk and potential defects through certified performance and high elongation (>700%) accommodating movement.
- Increases site efficiency with a simple one-part, high-build formulation reducing mixing errors and application time.
- Provides a durable, long-lasting waterproof barrier due to high tensile strength and seamless application.
- Offers versatility across various common non-exposed waterproofing scenarios in construction.
- Eliminates water tracking beneath the membrane due to its fully bonded nature when correctly primed.
- Low VOC formulation (<110 g/L) contributes to better air quality during application.
- Cold-applied system enhances site safety compared to hot-applied methods.
Professionals using Silcor 560 HB must prioritise safety and adhere to Australian Workplace Health and Safety (WHS) standards.
- Refer to SDS: Always read and understand the current Safety Data Sheet (SDS) for Silcor 560 HB and any associated primers/cleaners before use. SDSs are available from GCP.
- Personal Protective Equipment (PPE): Wear appropriate PPE, including chemical-resistant gloves (nitrile or neoprene), safety glasses or goggles, and protective clothing. If working in poorly ventilated areas, use a respirator with organic vapour cartridges (refer to SDS).
- Ventilation: Ensure adequate ventilation during application and curing, especially in enclosed spaces like bathrooms or lift pits, to minimise exposure to vapours.
- Handling: Avoid skin and eye contact. If contact occurs, wash skin thoroughly with soap and water. Flush eyes immediately with plenty of water for at least 15 minutes and seek medical attention. Do not ingest.
- First Aid: Follow first aid instructions on the SDS. Have eye wash stations available.
- Spills: Contain spills with absorbent material (sand, earth) and dispose of according to local council regulations. Do not allow product to enter drains or waterways.
- Clean-up Solvent (Xylene): Xylene is flammable and requires care. Use only in well-ventilated areas, away from ignition sources. Wear appropriate PPE.
- Site Safety: Adhere to all site-specific safety requirements and Safe Work Method Statements (SWMS).
Understanding the limitations of Silcor 560 HB is crucial for correct specification and successful application:
- Must Be Covered: Not UV stable. Cannot be used in exposed applications (trafficable or non-trafficable) unless permanently protected by screeds, tiles, pavers, ballast, soil, or Silcor Top Coat 75 (on exposed turn-ups only).
- Positive Side Waterproofing Only: Not suitable for negative hydrostatic pressure situations (e.g., internal basement walls against external water pressure).
- Substrate Moisture Critical: Do not apply to damp, wet, or contaminated substrates. Strict adherence to maximum moisture content limits (<5% or <6.9% depending on primer) is required.
- Environmental Constraints: Application must occur within the specified temperature (5-35°C), humidity (35-85% RH), and dew point (>3°C margin) ranges. Do not apply if rain is imminent.
- Not for Potable Water: Not recommended or certified for lining tanks intended for storing drinking water.
- Aggregate Blinding Requires Tie Coat: Do not broadcast aggregate directly into Silcor 560 HB for bonding subsequent finishes. The specified Silcor 575 HB + aggregate tie-coat system MUST be used.
- Root Resistance: Requires a separate certified root barrier for planter box or green roof applications where root resistance is specified.
- Minimum Falls Required: Substrates must have minimum falls to drainage (1:100 general, 1:80 showers) to prevent ponding.
Silcor 560 HB bonds successfully to a range of common construction substrates, provided they are correctly prepared and primed according to GCP recommendations. Failure to prepare or prime correctly will compromise system performance.
- Concrete (Min. 20MPa, 14-28 days cure): Must be structurally sound, clean, dry (<5% or <6.9% moisture depending on primer), and free of laitance, curing compounds (non-degrading types must be removed), oil, grease, dust, and defects. Surface profile equivalent to light broom or steel trowel finish (no burnished finishes). Repair defects (honeycombing, voids) with suitable PMC/epoxy mortar. Minimum pull-off strength: 0.6 MPa (internal), 1.0 MPa (external). Grind ridges, chamfer external corners (12mm). Chase non-moving joints/cracks (>1mm) 6x6mm or 10x10mm (square cut).
- Primer: Silcor Primer BS or Epocote F100W (<5% moisture); Epocote F100W only (5.0-6.9% moisture).
- Concrete Block Masonry (Min. 20MPa, core filled): Must be sound, flush pointed (no gaps), reinforced, and core filled. Prepare surface as per concrete. Highly porous blockwork may require sealing with fairing compound prior.
- Primer: As per concrete moisture content.
- Cementitious Screeds/Renders/Toppings (Min. 20MPa, min 3 days cure): Must be sound, stable, correctly graded (min 1:100 fall, 1:80 showers), clean, and dry. Prepare surface as per concrete.
- Primer: As per concrete moisture content.
- Compressed Fibre Cement (CFC) / Cement Composite Sheet (CCS): Must be installed per manufacturer's directions to stable framing. Clean, dry, free of sealers/coatings. Joints must be detailed per manufacturer.
- Primer: Silcor Primer BS recommended for best adhesion; Epocote F100W also suitable (<5% moisture).
- Water Resistant Plasterboard / Plywood / Timber: Must be structurally sound, suitable for purpose, clean, and dry. Install per manufacturer's directions.
- Primer: Epocote F100W.
- Metals (Steel, Aluminium, Copper, etc.): Must be clean, dry, free of corrosion, oil, grease. Abrade surface slightly to improve key. For difficult metals (stainless, copper, aluminium), clean then apply Dow DOWSIL™ 1200 OS Primer and apply membrane directly. For other metals:
- Primer: Epocote F100W or Silcor Primer BS after preparation.
- PVC / ABS Plastics: Must be clean, dry, free of contaminants. Lightly abrade surface.
- Primer: Epocote F100W or Silcor Primer BS.
- Aerated Autoclaved Concrete (AAC): Must be high-strength rendered type. Prepare render surface as per cementitious render.
- Primer: As per render moisture content.
Critical Note on Outgassing: Porous substrates (concrete, masonry) can release air/moisture vapour (outgas) when heating up, causing pinholes in primers/membranes. Assess substrate porosity after prep. Prime/apply membrane when substrate temperature is stable or falling to minimise risk.
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