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Silcor 560 HB Charcoal 22kg pail, GCP Class III polyurethane waterproofing membrane for AS 4654 compliant balconies & wet ...
Silcor 560 HB Charcoal 22kg pail, GCP Class III polyurethane waterproofing membrane for AS 4654 compliant balconies & wet ...

SILCOR® 560 HB

One-part Class III high-build polyurethane membrane for concealed wet areas, balconies, decks, podiums and protected waterproofing.

Vendor: GCP
SKU: SILCOR560HB/18.9
Availability: In Stock
$255.74
$255.74
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Download Product Data

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Description  

SILCOR® 560 HB is GCP's economical, one-part, high-solids polyurethane waterproofing membrane for non-exposed internal and external applications. It is a Class III high-extensibility membrane designed for horizontal, sloping and vertical substrates where the finished membrane will be permanently protected.

Where to use SILCOR 560 HB

  • Internal wet-area floors under or over screeds.
  • Balconies, roof decks and podiums beneath screeds, tiles, pavers or other approved protection.
  • Planters and landscaped areas with the specified protection and drainage build-up.
  • Other covered above-ground or below-ground waterproofing applications permitted by the current GCP specification.

What makes 560 HB different

560 HB is the concealed-work member of the Adheseal SILCOR range. Choose it where you need a one-part high-build polyurethane membrane but do not require the finished membrane itself to remain exposed or trafficable. If the project needs an exposed heavy-foot or light-vehicle system, compare SILCOR 580.

Important limitations

  • Not an exposed membrane: GCP does not recommend 560 HB for exposed trafficable or non-trafficable areas, except protected turn-ups as detailed in the current system.
  • Not a negative-pressure membrane.
  • Direct-stick finishes need a tie coat: GCP requires a compatible tie coat using SILCOR 575 HB or SILCOR 575 LB with broadcast aggregate before bonded screeds, renders, bedded pavers or direct-stick tiles are installed. Do not simply broadcast aggregate into the finished 560 HB membrane.

Primer selection

For prepared substrates below 5% moisture, current GCP guidance allows SILCOR Primer BS or EPOCOTE F100W Clear, depending on substrate. For prepared concrete and masonry between 5.0% and 6.9% moisture, GCP nominates EPOCOTE F100W Clear.

Protection and UV

560 HB must be permanently protected from damage and wear. Where membrane beneath pods, pavers or exposed turn-ups requires UV protection, follow GCP's current 560 HB detail, which specifies SILCOR Top Coat 75 or another approved UV-blocking protection. SILCOR Top Coat 80 should not be assumed to be a substitute.

Compare SILCOR 560 HB LVOC for the solvent-free, very-low-VOC alternative, or browse the full GCP SILCOR range.

Common Questions  

How flexible is SILCOR 560?
The current TDS reports more than 550% elongation to ASTM D412.

When can it be flood tested or tiled over?
After about 48 hours.

Can it be used as a trafficable finish?
No. The current TDS excludes trafficable use.

What coverage gives 1mm dry film thickness?
About 1.8kg/m².

Uses & Benefits  
One-part fast-curing high-solids polyurethane waterproofing membrane for wet areas, balconies, roof decks and tanking. Elongation is greater than 550% and tensile strength greater than 2.0MPa to ASTM D412. Ready for flood testing, tiling or topping after about 48 hours. At 1mm dry film thickness, coverage is about 1.8kg/m². Typical specified dry film thickness is 1.2–1.5mm for external and internal floor applications.
How To Apply  
Prepare surfaces so they are sound, smooth and free from dust, laitance, oil and other contaminants. Prime porous dry substrates with SILCOR Primer BS at about 0.15–0.3kg/m². Use the specified GCP damp-concrete primer where required. Mix the single-pack membrane mechanically at low speed until homogeneous. Do not mix by hand. Apply by brush, squeegee or roller in 2 coats. At 1mm dry film thickness allow about 1.8kg/m²; project film thickness is set by the application and specification. Allow about 48 hours before flood testing, tiling or topping.
Limitations and Safety Info  
Do not use as a trafficable finished surface. Use SILCOR Top Coat 80 where a UV-stable exposed finish is required. Recommended substrate moisture content is below 5%; use the specified damp-concrete primer where required. Allow concrete at least 28 days cure and render at least 7 days. If the second coat is delayed beyond 24 hours, follow GCP's solvent-cleaning preparation before recoating.
Suitable Substrates  
  • Concrete, block and brick.
  • Cement render.
  • Timber.
  • Compressed fibre-cement and GRC.
  • Aerated lightweight concrete.
  • Other stable substrates approved by GCP.

SILCOR® 560 HB Physical Properties

SILCOR® 560 HB Physical Properties
Property Value
Base Chemistry High solids, moisture curing polyurethane
Specific Gravity 1.48 g/ml
Viscosity 60,000 mPa.s
Solid Content 91 %w/w
VOC Content <110 g/L
Min Recoat Time 12 hours
Max Recoat Time 48 hours
Rain Resistant Time 2 hours
Min Through Cure Time 48 hours
Shore A Hardness > 55 °A
Tensile Strength > 5.0 MPa (AS 4858), > 3.0 MPa (AS 4654.1)
Elongation > 1400 % (AS 4858), > 700 % (AS 4654.1)
Classification Class III High Extensibility (AS 4858 / AS 4654.1)
Movement Capability Pass – No fatigue cracking exhibited
Water Vapour Transmission 4.36 g/m²/24h
Water Resistance Pass
Chemical Resistance Pass
Resistance to Detergent Immersion Pass
Heat Aging Pass
Flashpoint >72 °C
Density at 20 °C 1.5 g/cm³
Recoat Time 12
Full Cure 48

SILCOR® 560 HB - Use Cases

Here are some common examples on where SILCOR® 560 HB used by our customers.

Civil Construction

Retaining Wall Waterproofing

When waterproofing concrete retaining walls or lift pits prior to backfilling or covering with soil.

This Class III polyurethane membrane provides robust, fully bonded protection against water ingress, accommodating typical structural movement.

  • Class III AS 4654.1-2012
  • >700% elongation
  • >3 MPa tensile strength
  • Pass cyclic movement

Tiling

Internal Wet Area Floor

For waterproofing internal floors in bathrooms, laundries, and showers, beneath screeds or tiles.

Certified for internal wet areas, this Class III membrane forms a seamless, fully bonded barrier with low VOC, ideal for enclosed spaces.

  • Class III AS/NZS 4858-2004
  • >1400% elongation
  • <110 g/L VOC
  • Pass water immersion

Civil Construction

Waterproofing Retaining Walls, Lift Pits

Applying concealed waterproofing to concrete or blockwork for subterranean structures like retaining walls and lift pits.

Its Class III high-extensibility polyurethane accommodates typical ground and structural movements, preventing membrane failure in critical below-grade applications.

  • Class III, AS 4654.1-2012 certified
  • >700% elongation, >3MPa tensile
  • Liquid applied, fully bonded
  • For concrete, blockwork substrates

Waterproofing

Waterproofing Balconies Under Pavers

Installing concealed waterproofing on external balconies, rooftops, or decks prior to screeds, pavers, or ballast.

Engineered with Class III high-extensibility, it provides a flexible, fully bonded barrier under finishes, accommodating substrate movement without cracking.

  • Class III, AS 4654.1-2012 certified
  • >3.0 MPa tensile (AS 4654.1)
  • Low VOC <110 g/L
  • Cold applied, one-part

Roofing

Non-Exposed Deck Waterproofing

When sealing concrete rooftops, podiums, or balconies that will be covered by screed, ballast, or pavers.

A certified Class III liquid-applied membrane, it creates a seamless, high-build, fully bonded barrier that resists movement from thermal cycling.

  • Class III AS 4654.1-2012
  • Seamless monolithic
  • Pass heat ageing
  • Fully bonded system

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