Sikalastic®-625 N

• European Technical Assessment ETA-20/1023 2020-12-20

• Fire Testing EN 13501-1, Sikalastic®-625 N, Warringtonfire, Report No.WF 418126

• CE marking and declaration of performance based on European Technical Assessment ETA-20/1023. ETA issued on the basis of EAD 030350-00-0402 Liquid applied roof waterproofing kits.

Elastomeric aliphatic polyurethane

12 months from date of production

The Product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +30 °C. Always refer to the packaging.

Refer to the current Safety Data Sheet for information on safe handling and storage.

Laboratory-defined resistance to many individual chemicals. Before proceeding, contact Sika Technical Service for specific information.

WATERPROOFING KIT FOR ALL FLAT ROOFING TYPES

~ 1.5 mm DFT

The categorisation of levels of performance in accordance with EAD-030350-00-0402 are:

WATERPROOFING KIT FOR ALL METAL ROOFING TYPES

~ 0.7 mm DFT

The categorisation of levels of performance in accordance with EAD-030350-00-0402 are:

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

No rising moisture (ASTM D4263, polyethylene sheet)

Note: Times are approximate and will be affected by changing ambient conditions, particularly temperature and relative humidity.

FULLY REINFORCED ROOF WATERPROOFING (flat and pitched roofs)

Use reinforcement in all areas, such as flat and pitched roofs, gutters, communal walkways, podium decks and roof terraces, combined with appropriate reinforcing in localised areas,

LOCALLY REINFORCED ROOF WATERPROOFING (metal roofs)

Use reinforcement in localised areas for all joints, areas subject to differential movement, penetrations, drainage channels and for repairs to the membrane.

Note: Sikalastic®-625 N used in gutters that collect water from metal roofs must always be fully reinforced.

Note: Consumption data is theoretical and does not allow for any additional material due to surface porosity, surface profile, variations in level, wastage or any other variations. Apply the Product to a test area to calculate the exact consumption for the specific substrate conditions and proposed application equipment.

Select the most appropriate equipment for all applications required for the project.

SUBSTRATE PREPARATION EQUIPMENT

• Grinding equipment

• Manual or mechanical wire brushes

• High-pressure power washer

• Industrial vacuuming equipment

For other types of preparation equipment, contact Sika Technical Services.

MIXING EQUIPMENT

• Electric single-paddle mixer (300 to 400 rpm)

APPLICATION EQUIPMENT

• Brush

• Fleece roller

• Airless spray equipment

Penetrations and structural joints

Note: Additional Sika joint sealing solutions must be used for connections around penetrations and for construction joints.

SYSTEM DESIGN

Consider the following when designing the system:

• The supporting structure must be of sufficient structural strength to support all new and existing layers of the system build-up.

• If used as a roof system, the complete system must be designed to withstand and be secured against wind uplift loadings.

GENERAL

• The tensile adhesion strength of concrete substrates must be a minimum of 1.5 N/mm². If necessary, verify this by applying a test area first.

• Substrates must be free of standing water (no puddles), and clean and free of all contaminants such as dirt, oil, grease, coatings, laitance, surface treatments and loose friable material.

• All dust, loose and friable material must be completely removed from all surfaces before application of the product and associated system products, preferably by industrial vacuuming equipment.

• To confirm adequate surface preparation and adhesion of the Product , carry out a small trial before full application together with adhesion tests as required.

• Where ancillary products are mentioned, refer to the relevant Product Data Sheet.

BRICK MASONRY OR NATURAL STONE

1. Brick, stone and mortar joints must be sound and preferably flush finished.
2. Replace loose bricks, stone and mortar.
3. Apply strips or sections of  Sika® reinforcement over mortar joints.
4. Thoroughly clean the surface by power washing and allow to dry.
5. Prime the prepared surface with Sika® Concrete Primer or Sika® Bonding Primer. Refer to Product Data Sheet.

CONCRETE OR CEMENTITIOUS SCREEDS

1. Substrate must be sound with a minimum tensile adhesion strength of 1.5 N/mm², clean, dry and free of all contaminants such as dirt, oil, grease, coatings, laitance, surface treatments and loose friable material.
2. New concrete must be cured for at least 28 days and have a tensile strength > 1.5 N/mm².
3. IMPORTANT The final texture of the substrate must be open-textured and gripping. Prepare cementitious substrates mechanically using abrasive blast cleaning, planing or scarifying equipment to remove cement laitance.
4. Remove weak concrete and fully expose defects such as blow holes and voids. Note: suitable methods for surface preparation are high-pressure water jetting or abrasive blast cleaning. If using other pre-treatments such as scarifying and milling, subsequently use water jetting or blast cleaning to eliminate the remaining structural faults, remove cement laitance, and achieve an open and sound textured surface.
5. Repair and fill blow holes and voids using appropriate products from the SikaTop®, Sika MonoTop®, Sikafloor®, Sikadur® and Sikagard® range of materials.
6. Before applying coatings, remove high spots by grinding.
7. Remove dust by industrial vacuuming equipment.
8. Prime the prepared surface with Sika® Concrete Primer or Sika® Bonding Primer. Refer to Product Data Sheet.

METALS

1. Metals and existing coatings must be in a sound surface condition.
2. Abrade surfaces to remove any rust and loose coatings.
3. Bare metal must achieve a bright rust-free finish.
4. Prepare substrate mechanically using suitable abrading, grinding, rotating wire brush or other similar equipment.
5. Apply Sikalastic® Metal Primer N to optimise adhesion and protect metal from corrosion.
6. Apply strips or sections of Sikalastic®-100 SA Tape over joints and fixings.
7. Prime the prepared surface with Sikalastic® Metal Primer N. Refer to Product Data Sheet.

UNGLAZED CERAMIC TILES

1. Make sure all tiles are securely fixed.
2. Replace or fix any broken, loose or missing tiles.
3. Thoroughly clean the surface by power washing and allow to dry.
4. Prime the prepared surface with Sika® Concrete Primer or Sika® Bonding Primer. Refer to Product Data Sheet.

WOOD

1. Wood and wood-based panel roof decks must be in good structural condition and firmly fixed.
2. Replace or fix any defective or loose panels.
3. Any protruding screw heads must be reset below the surface of the top deck.  Nails must not be present either in the existing installation or as part of a refurbishment/new installation.
4. Remove any sharp protrusions from the surface.
5. Prepare substrate mechanically using suitable wood abrading equipment.
6. Remove dust by industrial vacuuming equipment.
7. Apply Sika® Concrete Primer or Sika® Bonding Primer to entire timber surface, including upstands.
8. Centre and apply Sikalastic®-100 SA Tape to timber panel joints.

BITUMINOUS FELT AND COATINGS

1. Thoroughly clean the surface by power washing and allow to dry.
2. Prime the prepared surface with Sikalastic® Metal Primer N. Refer to Product Data Sheet.

EXISTING

1. Thoroughly clean the surface by power washing and allow to dry.
2. Prime the prepared surface with Sika® Reactivation Primer. Refer to Product Data Sheet.

EXISTING FPO OR PVC ROOFING MEMBRANES

1. Contact Sika Technical Services for additional information.

IMPORTANT

Do not dilute with solvent or water.

The Product is supplied ready to use.

1. Prior to application mix for at least 2 minutes using an electric single-paddle mixer (300 to 400 rpm) until the liquid and all coloured pigment has achieved a uniform colour.

IMPORTANT

Strictly follow installation procedures

Strictly follow installation procedures as defined in Method Statements, application manuals and working instructions which must always be adjusted to the actual site conditions.

IMPORTANT

Protect from rain

After application, protect the Product from heavy rain or rain showers until dry to prevent surface damage.

IMPORTANT

No application on rising moisture

Do not apply on substrates with rising moisture.

IMPORTANT

Failure of reinforcement overlaps

To ensure a watertight seal is maintained all reinforcement overlaps must be to a minimum dimension.

1. Ensure side overlaps are greater than 100 mm and end overlaps are greater than 200 mm.

COATING

1. Always begin application with detailing (corners, upstands, joints) before installation of the main horizontal surfaces.
2. Apply the first layer of the Product evenly over the surface with a brush, roller or airless spray equipment. Note For consumption details, see Application Information.
3. Back-roll the surface in two directions at right angles with a fleece roller. Note Maintain a "wet edge" during application to achieve a seamless finish.
4. For a reinforced membrane lay the Sika® Reinforcement onto the wet base coat. Note The reinforcement fibres must be fully encapsulated within the base coat.
5. Apply a second layer of the Product evenly over the surface with a brush, roller or airless spray equipment. Note For consumption details, see Application Information.
6. Back-roll the surface in two directions at right angles with a fleece roller. Note Maintain a "wet edge" during application to achieve a seamless finish.
7. The coating must be continuous, pore free and to the required surface finish.

Clean all tools and application equipment with Sika® Thinner C immediately after use. Hardened material can only be removed mechanically.