Product Data Sheet Show all documents

Sikalastic®-520 Cool Coat Fibers IN

Micro fibre reinforced acrylic roof waterproofing and heat reflective coating (Formerly Sika® CoolCoat)

Sikalastic®-520 Cool Coat Fibers IN is a 1-part, acrylic, water based, elastic, cold applied liquid membrane that can be applied directly from the container. It contains addition of cross-linking polymers, special glass micro fibres, pigments and advanced antifungal additive that provides long lasting tough waterproofing membrane. The high solar reflective index of the membrane provides a heat reflective surface, minimises surface temperature of the membrane and reduces heat ingress keeping the interior of the building cooler and thereby increasing thermal efficiency of the building. The Product provides a seamless, smooth waterproof finish which is resistant to UV exposure and has elastic properties.

  • High solar reflectance index (SRI)
  • Minimises the surface temperature on roof and walls
  • Reduces energy for cooling of buildings
  • High adhesion to concrete, render, masonry, corrugated asbestos, bitumen, asbestos cement sheet and metal decks
  • Crack-bridging
  • Highly flexible and vapour permeable
  • Low VOC content
  • Resistant to permanent UV exposure
  • Excellent weather resistance and good service life
  • High resistance to chloride penetration, hence highly suitable for saline environment
  • Good resistance to mould and fungus
  • Cold applied - requires no heat or flame
  • Easy application by brush or roller
Product Data Sheet Show all documents

Usage

Sikalastic®-520 Cool Coat Fibers IN is used for:
  • Flat and sloping fully exposed roof structures
  • New construction and refurbishment projects
  • Waterproofing and renovation of old roof tiles
  • Waterproofing of external walls and sunshades
  • Roofs with numerous details such as penetrations, drains, roof lights and complex geometry
  • Exterior coating for PVC water tanks
   Sikalastic®-520 Cool Coat Fibers IN is used on the following substrates:
  • Concrete and cementitious substrates
  • Brick, masonry or renders
  • Unglazed clay tiles
  • Unglazed ceramic tiles
  • Asbestos or lime terraced roofs
 

Advantages

  • High solar reflectance index (SRI)
  • Minimises the surface temperature on roof and walls
  • Reduces energy for cooling of buildings
  • High adhesion to concrete, render, masonry, corrugated asbestos, bitumen, asbestos cement sheet and metal decks
  • Crack-bridging
  • Highly flexible and vapour permeable
  • Low VOC content
  • Resistant to permanent UV exposure
  • Excellent weather resistance and good service life
  • High resistance to chloride penetration, hence highly suitable for saline environment
  • Good resistance to mould and fungus
  • Cold applied - requires no heat or flame
  • Easy application by brush or roller

Packaging

10 kg container

Colour

Thick viscous liquid / White or Grey

Other colours on request subject to minimum order quantity.

Important: Applied colours selected from colour charts will be approximate.

Important: For colour matching, apply colour sample and confirm selected colour under real lighting conditions.

Important: When product is exposed to direct sunlight, there may be some discolouration and colour variation, this has no influence on the function and performance of the product finish.

Product Details

Product Information

Chemical base

Acrylic polymer dispersion, micro fibres and antifungal additives

Shelf life

12 months from date of production

Storage conditions

The product must be stored properly in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C
and +30 °C.

Density

~1.35 kg/L (+30 °C)

Solid content by weight

~66 %
System information

System structure

Layer

Product

Primer

Sikalastic®-10 Primer W

Base coat

Sikalastic®-520 Cool Coat Fibers IN

Top coatSikalastic®-520 Cool Coat Fibers IN
(Optional) Clear coatSikalastic®-10 Primer W

Important: Do not overcoat Sikalastic®-520 Cool Coat Fibers IN with tile, concrete or others. Sikalastic®-520 Cool Coat Fibers IN is an exposed system.

Important: For larger application areas and high demanding applications, use a glass fabric reinforcement Sika® Fabric-50 between the coats. For normal exposures, usage of Sika® Fabric-50 is optional. Reinforcement (partial or total) must be used over dynamic cracks and joints.

Important: For enhanced dirt pick up resistance and easy cleanability, above build up must be further coated with a thin layer of Sikalastic®-10 Primer W.
Technical Information

Shore A hardness

~45 (28d, +30 °C)

(ASTM D2240)

Tensile strength

~1.5 N/mm2

(ASTM D412)

Crack bridging ability

Passes up to 3.2 mm

(ASTM C1305)

Tensile adhesion strength

≥ 1.5 N/mm2

(EN 1542)

Tear strength

15 N/mm

(ASTM D624)

Solar Reflectance Index

112

(ASTM E1980)

Water absorption

< 20 %

(ASTM D570)

Behaviour after Artificial Weathering

No crack, No blisters, No change of gloss, 500 h

(ASTM D4587)

Dry film thickness

Unreinforced

~1.0 mm
Reinforced with Sika® Fabric-50

~1.2 mm

Application

Application Information

Ambient air temperature

+10 °C min. / +45 °C max.

Relative air humidity

80 % max.

Dew point

Beware of condensation. The substrate and uncured applied roof material must be at least +3 °C above dew point to reduce the risk of condensation on the surface finish.

Substrate temperature

+10 °C min. / +45 °C max.

Substrate moisture content

≤ 6 % parts by weight.
The following test methods can be used: Sika®-Tramex meter, CM-measurement or Oven-dry-method. No rising moisture according to ASTM (Polyethylene-sheet).

Waiting time / Overcoating

Base layer

Overcoating layer

Waiting time

Sikalastic-10 Primer W

Sikalastic®-520 Cool Coat Fibers IN

~30 min

Sikalastic®-520 Cool Coat Fibers IN

Sikalastic®-520 Cool Coat Fibers IN

~6–8 h

Note: Above values are at +30 °C and 50 % relative humidity. Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.

Applied product ready for use

Light traffic

~24 h

IMPORTANT
Applied Sikalastic®-520 Cool Coat Fibers IN must not be subjected to ponding before 7 days. Contact Sika Technical Services and refer to ASTM D5957 for more information.
Consumption

Consumption

Application

Product

Consumption

Roof waterproofing

Sikalastic®-520 Cool Coat Fibers IN

0.75 kg/m2 per coat

Heat reflective coatingSikalastic®-520 Cool Coat Fibers IN0.35 kg/m2 per coat
Wall waterproofingSikalastic®-520 Cool Coat Fibers IN0.35 kg/m2 per coat

Primer coat

Sikalastic®-10 Primer W

0.2–0.3 kg/m2 per coat

Seal coat

Sikalastic®-10 Primer W

0.05–0.08 kg/m2 per coat

Note: The consumption will vary depending on application area, substrate type, substrate roughness, surface profile, absorption of the surface and thickness required.
Application steps

EQUIPMENT

Substrate Preparation Equipment

  • Abrasive blast cleaning / planing / scarifying or grinding equipment
  • Manual or mechanical wire brushes
  • High pressure power washer

  

Mixing Equipment

  • Electric single paddle mixer (300–400 rpm)

  

Application Equipment

  • Brush: Soft bristle
  • Roller: Solvent resistant, “non-fuzzy”

MIXING

Important: Avoid over-mixing to minimise air entrainment.

Note: Use an electric single or double paddle mixer (300–400 rpm) with spiral paddle for mixing.

  • Product is supplied ready for use.
  • Before application, mix for at least 1 minute or until the liquid and all the coloured pigment has achieved a uniform colour.

APPLICATION

Important: Protect the coating from damp, condensation and direct water contact for at least 24 hours.

Important: If applied on porous substrates during rising temperatures pin holes may occur from rising air. Apply during falling temperatures.

Important: Do not apply on roofs with improper slopes leading to long ponding.

Important: Do not allow temporary ponding to remain between coats on any horizontal surfaces or until the final coating has totally cured. Brush or mop surface water away during this time.

  

PRIMER

  1. Pour the mixed primer onto the prepared substrate.
  2. Apply the product evenly over the surface with a brush or fleece roller. Ensure a continuous pore free coat covers the substrate.
  3. Back roll the surface in two directions at right angles with a fleece roller.

  

ROOF WATERPROOFING

Important: Apply 2 coats at the same consumption.

  1. Pour the mixed product onto the prepared substrate (for brush or roller application).
  2. Apply the product evenly over the surface with a short pile roller, a brush or airless spray. Note: The consumption is specified in Application Information.
  3. (Optional) Wherever coating is to be reinforced with glass fabric, lay Sika® Fabric-50 into the freshly applied base coat and embed firmly into the wet coat with brush. Reinforcement overlaps must be a minimum of 50 mm.
  4. After the inter-coat waiting time apply a second coat over the surface with a short pile roller, a brush or airless spray.
  5. (Optional) Apply one thin coat of Sikalastic®-10 Primer W for enhanced dirt resistance and cleanability.

    CLEANING OF TOOLS

    Clean all tools and application equipment with water immediately after use. Hardened material can only be removed mechanically.

     

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