Decostik®

Two-component, solvent-free polyurethane adhesive

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

Containers should be stored in an area that is well ventilated, dry and free fromextremes of temperature and humidity. Store at a temperature between 2°C and 25°C away from sources of heat and naked flames. Protect from frost. For best results, store Decostik®Parts A and B at 15°C to 25°C for 24 hours prior to application.
Only open containers when ready for use.

1.0 kg/L

100%

20% min/85% max

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

+5°C min. / + 20°C max.

For higher temperature applications use Decostik® HT)

Ensure the surface is visably dry. Substrate moisture content must be <20% wood moisture equivelent as measured by a protimeter.

* A short induction time may be necessary to facilitate pouring

No adjustments should be made to alter the mixing ratio of Decostik®.  Ensure that the full contents of the Part B tin are added to the Part A prior to mixing.  Do not mix part units.  Do not add solvents or thinners to the product Efforts should be made to minimise the contamination withDecostik® of surfaces to be overcoated.  Excess Decostik® should be removed with a scraper as work proceeds.  Do not overcoat uncured Decostik® with Sika products, the product should be allowed to cure for a minimum of 2 hours prior to overcoating.

Please Note:  Cure time will be lengthened in conditions of either low temperature and/or low relative humidity.

All existing surfaces are to be initially power washed in order to reveal a cleansurface suitable for adhesion, where necessary.  A minimum 2000 psi is recommended for preparation.  There is no specific maximum as this may vary according to the equipment used and the surfaces being cleaned.  At no time should the pressure jet be so high as to cause damage to the substrate being cleaned.  Adjust pressure to clean away contamination and friable material from the surface.
Note: Exercise suitable precautions when using high pressure equipment and check for any roof leaks and drainage for adequate flow.  The roof surface must be completely dry before applying Decostik®.

Timber - Ensure timber is in good condition, dry and free from oily preservatives before bonding membranes.  Decostik® is not a timber glue and individual pieces of timber should be fixed together traditionally before proceeding.

Concrete - Concrete should be sound and of good quality, appropriate for purpose, free from laitance, other contamination and dry.

Metal - Decostik®may be used to bond membranes onto metal. On surfaces such as corrugated sheeting ensure sufficient surface area contact is available.  Overboarding may be required in certain circumstances.  Decostik®is not anti-corrosive any metal requiring protection must therefore be treated before bonding.

Asphalt - Inspect the asphalt, gas blisters must be flattened, slump or sag reinstated, damaged asphalt removed and significant cracks filled.  Use an appropriate polymer modified mortar or other suitable approved compatible material.  Repairs are to be allowed to cure prior to application.  Seal all repairs to ensure the continuity of the vapour control layer.

Felt - Inspect the felt, vapour blisters must be star cut, turned back, dried out where necessary and then re-fixed. Badly cracked or degraded felt is to be replaced with Sika Liquid Plastics Carrier Membrane bonded in Decostik® adhesive.  Ensure the felt is correctly laid and/or suitably adhered and provides a smooth level surface to accept the following insulation system.  Seal all repairs to ensure the continuity of the vapour control layer.
Note:  Exercise all necessary care when cutting. Brush away excess grit from mineral surfaces.

Solar Reflective Paint - Ensure that the existing material is sound and firmly adhered. Loose or damaged coatings are to be removed.

To mix add all of Part B to Part A and mix together until uniform with a electric drill aand paddle for 2 minutes.  Ensure all Part B material is well scraped out into Part A.  When fully mixed, the Decostik® should be free from streaks and of a uniform colour.

Mix always mechanical with drill iedeally EPI or equivalent mixing paddle.

Use a Decostik® Applicator or a pouring can to apply the Decostik® for a standard bonding.  Alternatively a full bond can be achieved by spreading Decostik® as a coating with a roller or squeegee.  Coverage will vary depending on surface being treated and method of bonding 0.5L to 1L/m2 is normal.

A pouring can or Decostik® Applicator is used to snake the Decostik® to the structural deck, the Vapour Control Layer or the Decotherm® Insulation.

Note:  The Decostik® should be allowed to fully cure, particularly on any exudation at joints, before overcoating with the waterproofing system.