Sikalastic®-590 Plus AU

Sikalastic®-590 Plus AU complies with AS4654.1- 2012 External Waterproofing Membranes

Polyurethane/ Polysiloxane 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.

1.39kg/L

< 1 gram/Litre

WATERPROOFING MEMBRANE COATING -1.2mm DFT
For UV-stable (light foot traffic) coating to extend the life of old roofs or as reflective coating to enhance energy efficiency.
▪ For detail system build up, please refer to table below :

PROTECTIVE COATING -500 micron DFT
For non-trafficable areas requiring a protective coating solution in new construction and refurbishment projects.
▪ For detail system build up, please refer to table below :

74

0.50MPa (peak)

1.68MPa (with and without primer)

+15 °C min / +35 °C max

80 % r.h. max

Beware of condensation, Surface temperature during application must be at least 5 °C above dew point.

+15 °C min / +35 °C max

< 5 % moisture content.

No water / moisture / condensation on the substrate.

2 hours at 500 micron

3 hours at 800 micron

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

Flood test can be conducted after 48 hours from application

Foot traffic allowed after 7 days from application

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

1 Litre per 1m² @ 500 micron DFT (15m² per drum)

2.4 Litres per 1m² @ 1200 micron DFT (6.25m² per drum)

Cementitious Substrate:

• 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 abrasive blast cleaning or scarifying equipment to remove cement laitance and to achieve an open textured surface.
• Loose friable material and weak concrete must be completely removed 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 products from the Sikafloor®, SikaDur® and SikaGard® range of materials.
• High spots must be removed by e.g. 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. Installing the membrane either when the concrete temperature is falling or stable can reduce outgassing. It is generally beneficial, therefore, to apply the embedment coat in the late afternoon or evening.
• Always prime the substrate to increase bond strength of the coating and to consolidate the existing substrate.

Brick and Stone:

• Mortar joints must be sound and preferably flush pointed. Brick and stone should be primed with Sikalastic® Roof Primer or Sikatite® Moisture Seal 2k if moisture is present. Use a suitable bond breaker over joints and prime before applying Sikalastic®-590 Plus AU. (Contact Sika Technical for advice on joint sealing before application of membrane)

Bituminous Sheets/Coatings:

• Bituminous sheet membranes should not have sticky or mobile surfaces and should be thouroughly cleaned; apply Sikalastic®-590 Plus AU with addition of 10% water as a primer coat and allow to dry before applying the chosen Sikalastic®-590 Plus AU membrane system. Use suitable bond breaker over any existing joints. (Contact Sika Technical for advice on joint sealing before application of membrane)
• Volatile mastic coatings, old coal tar coatings, bitumen based liquid membranes should not have sticky or mobile surfaces and should be thouroughly cleaned, apply Sikalastic®-590 Plus AU undiluted directly to the surface and allow to dry before applying the chosen Sikalastic®-590 Plus AU membrane system. Use suitable bond breaker over any existing joints. (Contact Sika Technical for advice on joint sealing before application of membrane)
• Please note a site adhesion test is highly recommended to ensure minimum bond strenth of 1MPa (pull off test) is achieved and no reaction between Sikalastic®-590 Plus AU and the existing coating is apparent before undertaking the entire application.

Existing Paints/Coatings:

• Ensure the existing material is sound, firmly adhered and remove any oxidized layers. A site adhesion test is highly recommended to ensure minimum bond strenth of 1MPa (pull off test) is achieved and no reaction between Sikalastic®-590 Plus AU and the existing coating is apparent before undertaking the entire application.

Metals:

• For aluminium/colorbond surfaces, it is highly recommended to solvent wipe the existing surface to remove any present oxidation which could affect long term adhesion of the new coating. Once this has been completed, apply Sikalastic® Roof Primer before applying Sikalastic®-590 Plus AU.

Prior to the application of Sikalastic®-590 Plus AU, the primer coat has to be used and it must have cured tack-free. The primer coat is Sikalastic® Roof Primer and consumption is approximately 12m2 per litre depending on porisity of the substrate. For the Waiting Time / Overcoating please refer to the PDS of the appropriate primer. Please note Sikalastic® Roof Primer will only have a silification effect on porous, well prepared, clean cementitious substrates. 

For substrates containing over 5% moisture content Sikatite® Moisture Seal 2k should be used as the primer coat, please refer to the PDS for consumption rates.

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