Sikalastic®-598
1-part liquid applied membrane for wall and roof waterproofing
Sikalastic®-598 is a 1-part, PU-modified, water based, elastic, cold applied liquid membrane. It provides a seamless, smooth waterproof finish which is resistant to UV exposure and has elastic properties. It is fast drying for increased productivity and early resistance to rain damage.
- Early resistance to rain damage
- Fast application increases productivity and reduces installation time
- Applied by brush or roller
- The high build properties allow application over uneven substrates
- Good crack-bridging properties
- Resistant to permanent UV exposure
- Non-toxic and VOC compliant water based coating
Usage
- Flat and sloping fully exposed roof structures
- New construction and refurbishment projects
- Waterproofing of external walls
- Waterproofing and renovation of old roof tiles
- Roofs with numerous details such as penetrations, drains, roof lights and complex geometry
Advantages
- Early resistance to rain damage
- Fast application increases productivity and reduces installation time
- Applied by brush or roller
- The high build properties allow application over uneven substrates
- Good crack-bridging properties
- Resistant to permanent UV exposure
- Non-toxic and VOC compliant water based coating
Packaging
25.4Kg in plastic pail
Colour
Grey and White
Product Details
SUSTAINABILITY
Singapore Green Label certified
Chemical base
PU-Modified Acrylic
Shelf life
12 months
Storage conditions
Stored properly in dry conditions, temperatures between +5 °C and +30 °C.
Density
| 1.27 ± 0.05 kg/l (+23 °C) | (ISO 2811-1) |
System Structure
A partially reinforced system must always be used in areas of high movement, irregular substrates of to bridge cracks, joints and seams on the substrate.
Roof coating
| Layer | Product | Consumption |
| Primer | Sikalastic®-500 Acrylic Primer AP or Sikalastic® U-Primer depending on the substrate | ~0.2 kg/m2 |
| 1st coat | Sikalastic®-598 | 0.7 kg/m2 |
| 2nd coat | Sikalastic®-598 | 0.6 kg/m2 |
Reinforced roof waterproofing
| Layer | Product | Consumption |
| Primer | Sikalastic®-500 Acrylic Primer AP or Sikalastic® U-Primer depending on the substrate | ~0.2 kg/m2 |
| 1st coat | Sikalastic®-598 | 0.7 kg/m2 |
| Reinforcement | Sika® Reemat Premium or Sikalastic® Fleece-80 | 1 m2 |
| 2nd coat | Sikalastic®-598 | 0.6 kg/m2 |
| 3rd coat | Sikalastic®-598 | 0.6 kg/m2 |
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.
Shore A Hardness
| > 60 | (ASTM D2240:15) |
Tensile Strength
| > 3 N/mm2 | (ASTM D412-16) |
Crack Bridging Ability
| No crack at 2 mm crack width(Unreinforced) | (BS EN 14891:2017) |
Adhesion in Peel
| > 1.5 N/mm2 | (ASTM D7234) |
Behaviour after Artificial Weathering
| No cracking, chalking, blistering, peeling, decay and de-lamination after 2000hours in the QUV accelerated weathering | ASTM G154-16 |
Application
Ambient Air Temperature
+5 °C min. / +40 °C max.
Relative Air Humidity
80 % maximum
Dew Point
Beware of condensation. The substrate and uncured applied roof material must be at least +3 °C above dew point.
Substrate Moisture Content
≤ 6 % moisture content. The substrate must be visibly dry with no standing moisture.
No rising moisture according to ASTM(polyethylene-sheet).
Waiting Time / Overcoating
1 - 4 hours depend on the coating thickness and temperature of substrate
Applied Product Ready for Use
~24 hours
Time is approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.
EQUIPMENT
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
SUBSTRATE PREPARATION
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 Sikalastic-500 Acrylic Primer AP
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 Sikalastic U-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 Sikalastic U-Primer over the complete coating.
For the other substrates: please contact to Sika Technical Department.
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. Avoid over-mixing to minimise air entrainment.
APPLICATION
Prior to application of Sikalastic®-598, the priming coat must be applied and it must have cured tack-free. Damageable areas (door frame) have to be protected with an adhesive tape.
ROOF COATING
Process: Primer > 1st coat > 2nd coat
Primer
- Pour the mixed Product onto the substrate. The consumption is specified in product data sheet
- Apply the Product evenly over the substrate with one of the tools specified in Equipment.
- Back roll the surface in two directions at right angles with a fleece roller.
- Apply the first layer of Sikalastic®-598 maintaining a wet edge to ensure a seamless membrane. Once the first layer has cured(refer to waiting time to overcoating section above) apply the send layer of Sikalastic®-598 with one of the tools specified in Equipment.
ROOF WATERPROOFING
Process: Primer > 1st coat > Reinforcement application > 2nd coat
Reinforcement application
- It is recommended to work 1.0 m at a time lengthways applying the 1st coat and embedding the reinforcement.
- Lay the reinforcement onto the wet 1st coat. Make sure reinforcement overlaps are greater than 50 mm.
- Use a short pile roller to roll over the reinforcement and resin. Make sure reinforcement completely embedded and thoroughly saturated
CLEANING OF TOOLS
Clean all tools and application equipment with Thinner C immediately after use. Hardened material can only be removed mechanically.