Sikalastic®-598

PU-Modified Acrylic 

12 months

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

65 % (+23 °C / 50 % r.h.)

49 % (+23 °C / 50 % r.h.)

IMPORTANT

A fully reinforced system must always be used over bituminous felt and coatings.

A partially reinforced system must always be used in areas of high movement, irregular substrates or to bridge cracks, joints and seams on the substrate.

Roof coating

Reinforced roof waterproofing

These figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level, wastage or any other variations. Apply product to a test area to calculate the exact consumption for the specific substrate conditions and proposed application equipment.

+5 °C min. / +40 °C max.

+5 °C min. / +40 °C max.

80 % maximum

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

+5 °C min. / +40 °C max.

Minimum +3 °C above dew point

≤ 6 % parts by weight.

The substrate must be visibly dry with no standing moisture.

The following test methods can be used: Sika®-Tramex meter, CM-measurement or Oven-dry-method. No rising moisture according to ASTM (Polyethylene-sheet).

Apply one coat at a time, allowing an interval of 2 to 4 hours between coats, depending on the coating thickness.

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

~24 hours

Time is approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.

Approximately 30m² per 20 kg for 1 coat at WFT @ 0.5mm

Select the most appropriate equipment required for the project:
Substrate Preparation Equipment

• Abrasive blast cleaning / planing / scarifying or grinding equipment.
• Manual or mechanical wire brushes.
• High pressure power washer.

For other types of preparation equipment, contact Sika Technical Services
 

Mixing Equipment

• Electric single or double paddle mixer (300–400 rpm) with spiral paddle

For other types of mixing equipment, contact Sika Technical Services
 

Application Equipment

• Brush: Soft bristle
• Roller: Solvent resistant

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

• Substrates must be free of all contaminants such as dirt, oil, grease and loose friable material.

• 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 Product adhesion, carry out a small trial before full application together with adhesion tests as required.

Cementitious substrates

• 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.
• New concrete must be cured for at least 28 days and have a tensile strength > 1.5 N/mm².

• 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.
• High spots can be removed by grinding.
• Weak cementitious substrates must be removed and surface defects such as blow holes 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. Products must be cured before applying Sikalastic®-598.
• Use Davco Acrylic Primer or refer to Sika representative.

Bitumen sheet membranes

IMPORTANT

Always use a fully reinforced system over bitumen sheet membranes.

• Make sure the bituminous felt is firmly bonded or mechanically fixed to the substrate and does not contain any badly degraded areas.
• Remove completely or repair any degraded or missing sections.

Treat surfaces as detailed below.

Surface treatment

• Mineral granules and talc finish: Remove loose granules and apply Davco Primer XP or similar (e.g. Davco Acrylic Primer) over the complete membrane.
• Polyethylene foil finish: Warm foil finish by lightly gas torching.
• Texflamina finish: Must be new.

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.

• Bituminous, volatile mastic or old coal tar coatings must be sound, firmly bonded, rigid and with a tack free surface.
• Remove any loose layers.
• Thoroughly clean with detergent and water and allow to dry.
• Apply Davco Primer XP or similar over the complete coating.

Brick and stone

• Mortar joints must be sound and preferably flush pointed.
• Replace loose bricks, stone and mortar.
• Apply strips or sections of Sika® reinforcement over mortar joints.
• Thoroughly clean the surface by power washing and allow to dry.

Unglazed ceramic tiles

• Ensure all tiles are securely fixed.
• Replace any broken, loose or missing sections.
• Power wash the surface.

Clay tiles

• Make sure all tiles are securely fixed.
• Replace or fix any broken, loose or missing tiles.
• Thoroughly clean the surface by power washing and allow to dry.

Metal

• Metals and existing coatings must be in a sound surface condition.
• Abrade surfaces to remove any rust and loose coatings.
• Bare metal must achieve a bright rust-free finish.
• Prepare substrate mechanically using suitable abrading, grinding, rotating wire brush or other similar equipment.
• Apply Davco Primer XP to optimise adhesion and protect metal from corrosion.
• Apply strips or sections of Sika® reinforcement over joints and fixings or refer to Sika representative..

Paints/Coatings

IMPORTANT  

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

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

Existing Sikalastic®-598

IMPORTANT

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

• The existing Product must be sound and firmly bonded to the substrate.
• Remove completely or repair any deteriorated or missing sections.
• Roughen the surface by lightly abrading using light abrasive manual tools or mechanical equipment.
• Depending on the type of membrane, a solvent wipe may also be required. Contact Sika Technical Services for additional information.
• Remove dust by industrial vacuuming equipment.

IMPORTANT

Avoid over-mixing to minimise air entrainment.

Note: Use an electric single or double paddle mixer (300–400 rpm) with spiral paddle for mixing.

• Product 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.

INSTALLATION PROCEDURE

Reference must be made to further documentation where applicable, such as relevant method statement, application manual and installation or working instructions.

IMPORTANT

Confirm waiting /overcoating times are achieved before applying subsequent coats / products.

Primer

IMPORTANT

Do not apply on substrates that are unstable.

IMPORTANT

Do not apply on substrates with rising moisture.

Equipment: 

• Fleece roller
• Brush

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

1. Pour the mixed Product onto the surface. The consumption is specified in the individual primer product data sheet Application Information.
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. 

Result: The primer must be continuous and pore free.

ROOF COATING

Equipment: 

• Fleece roller
• Brush

1^st coat

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

Before application, confirm substrate moisture content, substrate and air temperatures.

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

1. Pour the mixed Product onto the substrate. The consumption is specified in Application Information.
2. Apply the Product with one of the tools specified in Equipment.
    
3. Back roll the surface in two directions at right angles with a fleece roller. Important: Avoid going back to re-work areas that are partially dried as this may damage the surface finish.

Result: The coating must be continuous and pore free.

2^nd coat

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

Before application, confirm substrate moisture content, substrate and air temperatures.

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

1. Pour the mixed Product onto the substrate. The consumption is specified in Application Information.
2. Apply the Product with one of the tools specified in Equipment.
3. Back roll the surface in two directions at right angles with a fleece roller. Important: Avoid going back to re-work areas that are partially dried as this may damage the surface finish

Result: The coating must be continuous and pore free.

ROOF WATERPROOFING

Reinforced waterproof membrane

Equipment: 

• Fleece roller
• Brush

1^st coat

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

Before application, confirm substrate moisture content, substrate and air temperatures.

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

1. Pour the mixed Product onto the substrate. The consumption is specified in Application Information.
2. Apply the Product with one of the tools specified in Equipment.
3. Back roll the surface in two directions at right angles with a fleece roller. Important: Avoid going back to re-work areas that are partially dried as this may damage the surface finish

Result: The coating must be continuous and pore free.

Reinforcement application

1. It is recommended to work 1.0 m at a time lengthways applying the 1^st coat and embedding the reinforcement.
2. Make sure reinforcement overlaps are greater than 50 mm.
3. Lay the reinforcement onto the wet 1^st coat
4. Use a short pile roller to roll over the reinforcement and resin

Result: The reinforcement fibres must be fully encapsulated within the resin.
 

2^nd coat

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

Before application, confirm substrate moisture content, substrate and air temperatures.

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

1. Pour the mixed Product onto the substrate. The consumption is specified in Application Information.
2. Apply the Product with one of the tools specified in Equipment.
3. Back roll the surface in two directions at right angles with a fleece roller.
   IMPORTANT
   Avoid going back to re-work areas that are partially dried as this may damage the surface finish

Result: The coating must be continuous and pore free.

3^rd coat

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

Before application, confirm substrate moisture content, substrate and air temperatures.

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

1. Pour the mixed Product onto the substrate. The consumption is specified in Application Information.
2. Apply the Product with one of the tools specified in Equipment.
3. Back roll the surface in two directions at right angles with a fleece roller.

IMPORTANT
Avoid going back to re-work areas that are partially dried as this may damage the surface finish

Result: The coating must be continuous and pore free.

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