Sikalastic®-525 RoofPro GCC

• Conforms to the requirements of LEED EQ Credit 4.2: Low - Emitting Materials: Paints & Coatings: VOC < 100 g/l
• Conforms to Solar Reflectivity Index (SRI) requirement of ≥ 78, for white color

Polyurethane modified acrylic dispersion

12 months from date of production if stored properly in original, unopened and undamaged sealed packaging.

The product must be stored properly in dry conditions at temperatures between +5 °C and +30 °C.

~1.32 kg/l (+25 °C)

~63 %

~48 %

Reinforced Roof Waterproofing

For cost efficient waterproofing solutions in new construction and refurbishment projects.

Non-reinforced Roof Waterproofing

For UV-stable coating to extend life of old roofs or as a reflective coating to enhance energy efficiency.

-5 °C min. / +80 °C max. 

+10 °C min / +40 °C max

80 % max.

Beware of condensation. Surface temperature during application must be at least +3 °C above dew point.

+10 °C min. / +40 °C max.

< 6 % moisture content.
No rising moisture according to ASTM (Polyethylene sheet).
No water / moisture / condensation on the substrate.

Applying Sikalastic®-525 RoofPro GCC on Sikalastic®-525 RoofPro GCC diluted with 10 % water as a primer:

Applying subsequent coat of Sikalastic®-525 RoofPro GCC on previous coat of Sikalastic®-525 RoofPro GCC:

¹⁾ Assuming that all dirt has been removed and intercoat contamination is avoided.

Note : Times are approximate and will be effected by changing ambient conditions particulary temperature and relative humidity. Low temperature and high relative humidity retards curing, while high temperature and low relative air humidity accelerates curing progression.

Airless spray equipment: 
Recommended for metal roof. The pump should have the following parameter: 

• min. pressure: 220 bar 
• min. Ø nozzle: 0.023 inch

For example: Graco Classic 495 PC Airless Spray with Blue Tex Spray Gun / Tip  (RACX / LTX523)

All substrates must be cleaned and prepared using high-pressure water jet, abrasive blast cleaning, scarifying equipment, or other suitable approved mechanical methods.

Cementitious substrates:

• New concrete should be cured for at least 28 days and should have a pull-off strength ≥ 1.5 N/mm².

• Cementitious or mineral based substrates must be prepared mechanically using suitable approved methods to achieve an open textured surface.
• Loose friable material and weak concrete must be completely removed by mechanical methods and surface defects such as blowholes and voids must be fully exposed.
• Repairs to the substrate, filling of joints, blowholes/voids and surface levelling must be carried out using appropriate Sika® products. Refer to Sika’s Technical Department for further advice. 
• High spots must be removed by mechanical methods such as grinding.
• Outgassing is a naturally occurring phenomenon of concrete that can produce pinholes in subsequently applied coatings. The concrete must be carefully assessed for moisture content, air entrapment, and surface finish prior to any coating work. Applying the coating either when the concrete temperature is falling or stable can reduce outgassing.
• Prime the substrate before applying Sikalastic®-525 RoofPro GCC system.

Bituminous felt:

• Ensure that bituminous felt is firmly adhered or mechanically fixed to the substrate.

• Bituminous felt should not contain any badly degraded areas and be primed before applying Sikalastic®-525 RoofPro GCC. 

Metals:

• Metals must be in a clean, sound, and rust free condition.

• Metals surfaces must be free of oil, greases and any contaminants that could impair coating adhesion.

• Abrade exposed surfaces to reveal bright metal.

• Use localised reinforcement such as Sikalastic® Flexitape Heavy or Sika® Joint Tape SA over joints and fixings. 

Paints and Coatings:

• Ensure the existing material is sound and firmly adhered.

• Remove any oxidized layers.

• Use localized reinforcement over joints.

PRIMING

It is important that substrates are primed prior to application of  Sikalastic®-525 RoofPro GCC coating to seal the substrate and for optimum adhesion.

Use the following primers for suitable type of substrates.

Prior to application, stir Sikalastic®-525 RoofPro GCC thoroughly for 1 minute in order to achieve a homogeneous mixture.
Avoid over mixing to minimise air entrainment.

Prior to application of Sikalastic®-525 RoofPro GCC, the primer must have cured as per the respective overcoating time.

Sikalastic®-525 RoofPro GCC application with reinforcement:

• Apply first coat of Sikalastic®-525 RoofPro GCC with reinforcement, Sika® Reemat Premium, starting on skirtings and detailing areas before horizontal application. Apply Sikalastic®-525 RoofPro GCC at 1.5 kg/m². Work only so far in advance that the material stays liquid then lay the reinforcement, Sika® Reemat Premium on the wet coating. Press the reinforcement against the coating using a paint roller and allow the coating to embed the reinforcement. Allow the application to sufficiently dry for further coats.

• Check the reinforced coating application and seal any pinholes prior to subsequent coats.

• Apply the second coat of Sikalastic®-525 RoofPro GCC at 0.5 kg/m². Ensure that the reinforcements are fully embedded. Allow to dry as per recommended overcoating time.

• Apply the final coat of Sikalastic®-525 RoofPro GCC at 0.5 kg/m² and allow to fully dry as per recommended curing time.

Sikalastic®-525 RoofPro GCC application without reinforcement:

• Sikalastic®-525 RoofPro GCC is applied in minimum three coats at 0.5 kg/m² per coat using brush, roller or airless spray.

• Seal all pinholes from initial coat prior to application of subsequent coats.

• Allow coating layers to dry as per recommended overcoating time.

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