Sikalastic®-631

• Odournet – Report Number SIKA15A_roof_01_LW
• CE Marking and Declaration of Performance to European Technical Assessment ETA-14/0177, based on ETAG 005 Part 1 and Part 6 — Liquid applied roof waterproofing kits. Part 1: General. Part 6: Specific stipulations for Kits based on Polyurethane
• Water Vapour Transmission Properties according to BS EN 1931:2000, Flexible Sheets for Waterproofing, Method B for Plastic or Rubber sheets
• External fire performance: Broof (t1)(t4) as part of SikaRoof® i-Cure systems
• Reaction to fire according to EN 13501-1: Euroclass E as part of SikaRoof® i-Cure systems

1-part, aromatic polyurethane

12 months from date of production

Product must be stored in original, unopened and undamaged packaging in dry conditions at temperatures between +0 °C and +25 °C. Always refer to packaging.

~1.45 kg/l approx. (+23 °C)

~83.2 % (+23 °C / 50 % r.h.)

~78.0 % (+23 °C / 50 % r.h.)

Refer to the System Data Sheets of SikaRoof® i-Cure systems

-30 °C to +90 °C

+5 °C min. / +35 °C max.

20 % r.h. min. / 85 % r.h. max.

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

+5 °C min. / +60 °C max.
 

The Product can be applied on substrates with a moisture content of ≤ 4 %. The substrate must be visibly dry with no standing water.

The following test methods can be used to determine the substrate moisture content:

• Sika®-Tramex meter
• CM-measurement
• Oven-dry-method

Refer to the System Data Sheets of SikaRoof® i-Cure systems

~30 minutes (+20 °C / 50 % r.h.)

• The product  is formulated for fast curing.
• Material in opened containers must be applied immediately.  
• Pot life will decrease at higher temperatures and increase at
  lower temperatures.

Note:After four days, the surface must be cleaned and primed with Sika® Reactivation Primer before applying subsequent coats.

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

Refer to System Data Sheets of SikaRoof® i-Cure systems

Application equipment

• Fleece roller
• Squeegee
• Brush

IMPORTANT

The supporting structure must be of sufficient structural strength to support the new and existing layers of the roof build-up. The complete roof system including existing layers must be designed and secured against wind uplift loadings.

General

• Tensile adhesion strength of the substrate 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), 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 Sikalastic®-631 adhesion, carry out a small trial before full application together with adhesion tests as required.

Asbestos cement roof panels

1. The roof panels must be in good structural condition, firmly bonded or mechanically fixed.
2. Replace or fix any defective or loose panels.
3. Thoroughly clean the surface in accordance with techniques that comply with local asbestos regulations and allow to dry if a wet technique is used.
4. Remove dust by industrial vacuuming equipment.
5. Apply Sika® Concrete Primer to entire surface, including upstands.
6. Any work involving asbestos must be in accordance with WorkSafe New Zealand's Approved Code Of Practice - Management and Removal of Asbestos

Bitumen sheet membranes

IMPORTANT

Always use a fully reinforced system over bitumen sheet membranes.

1. Make sure the bituminous felt is firmly bonded or mechanically fixed to the substrate and does not contain any badly degraded areas.
2. Remove completely or repair any degraded or missing sections.
3. Volatile bitumen must be sealed with Sikalastic® Metal Primer N before applying coating system.
4. Remove loose granules/debris before continuing with installation process.

Bituminous coatings

IMPORTANT

Always use a fully reinforced system over bituminous coatings.

IMPORTANT

Old existing coatings which are not fully bonded to substrate must be removed.

1. Bituminous, volatile mastic or old coal tar coatings must be sound, firmly bonded, rigid and with a tack free surface.
2. Remove any loose layers.
3. Thoroughly clean with soap and water and allow to dry.
4. Apply Sikalastic® Metal Primer N over the complete coating.

Brick and 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.

Concrete

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. Substrates must be prepared mechanically using suitable substrate preparation equipment to remove cement laitance and achieve an open textured gripping surface profile suitable for the product thickness.
4. High spots can be removed by grinding.
5. Weak cementitious substrates must be removed and surface defects such as blow holes and voids must be fully exposed.
6. 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. Products must be cured before applying Sikalastic®-631.
7. Remove dust by industrial vacuuming equipment.
8. Apply Sika® Concrete Primer to entire surface, including upstands.

Ferrous 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 Sika® reinforcement over joints and fixings.

Paints / Coatings

IMPORTANT

Old existing coatings which are not fully bonded to substrate must be removed.

1. The existing paint / coating must be sound and firmly bonded to the substrate.
2. Remove any oxidised or loose layers.
3. Prepare substrate mechanically using suitable abrading, grinding, rotating wire brush or other similar equipment.
4. Thoroughly clean the surface by power washing and allow to dry.

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.

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. Make sure that any nail or screw heads that are protruding above the surface of the top of the deck are hammered or screwed below the surface.
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 to entire timber surface, including upstands.
8. Centre and apply Sikalastic®-100 SA Tape to timber panel joints.

IMPORTANT

Do not dilute with solvent or water.

Note: Mixing is not required, however if the product has separated, stir gently by manual or mechanical equipment thoroughly to achieve a uniform colour.

• Sikalastic®-631 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.  

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

Note:Protect areas adjacent to the application from splashes with tape or plastic wrapping.

Note:Confirm waiting / overcoating times of any previous coats, is achieved before applying subsequent coats. (Refer to waiting / overcoating time in Application Information)

Note:Confirm product application conditions: substrate moisture content, substrate, air and product temperatures, relative humidity and dew point (Refer to Application information).

Note:Always begin application with detailing (i.e. corners, upstands, joints etc) before installation of the main horizontal surfaces.

Reinforced coating system

Primer (If required)

IMPORTANT

Make sure the primer on the substrate is continuous and pore free.

Note:Refer to individual primer Product Data Sheet.

1. Pour the stirred/mixed primer onto the prepared substrate.
2. Apply the product evenly over the surface with a brush or fleece roller.
3. Back roll the surface in two directions at right angles with a fleece roller.
4. The primer must be continuous, pore free and to the required surface finish.

Base coat

1. Pour the stirred product onto the substrate. The consumption is specified in the System Data Sheets of SikaRoof® i-Cure systems.
2. Apply the product evenly over the surface with a brush, fleece roller or a squeegee.

Reinforcement

IMPORTANT

Make sure reinforcement overlaps are greater than 50 mm.

Note:It is recommended to work 1.0 m at a time, lengthways, applying the 1st coat and embedding the reinforcement.

1. Lay Sika® Reemat Premium onto the wet base coat.
2. Use a short pile roller to roll over the reinforcement and resin several times.
3. The reinforcement fibres must be fully encapsulated within the resin.
4. Protect product from heavy rain or rain showers until dry to prevent surface damage.

Top coat (Sikalastic®-641 TC)

1. Pour the stirred product onto the substrate. The consumption is specified in the System Data Sheets of SikaRoof® i-Cure systems.
2. Apply the product evenly over the surface with a brush, fleece roller or a squeegee.
3. Back roll the surface in two directions at right angles with a fleece roller.
4. Avoid going back to re-work areas that are partially dried as this may damage the surface finish.
5. The coating must be continuous, pore free and to the required surface finish.
6. Protect product from heavy rain or rain showers until dry to prevent surface damage

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