Sikalastic®-590
ECONOMICAL LIQUID APPLIED ROOF WATERPROOFING WITH IMPROVED PONDING WATER CAPABILITY
Sikalastic®-590 is one component polyurethane – acrylic dispersion with improved water ponding resistance, excellent UV resistance, good crack bridging capacity and great esthetics. For manual / spray application, Sikalastic®-590 can be applied as coating or a reinforced liquid applied membrane with Sikalastic Fleece.
- Good behavior under limited water ponding
- UV resistant and resistant to yellowing and weathering
- Highly elastic and crack-bridging
- Non-toxic and VOC compliant water based coating
- One component - ready to use
- Excellent adhesion on porous and non-porous substrates
- Seamless waterproofing membrane
- Water vapour permeable
Usage
- For waterproofing solutions in both new construction and refurbishment projects
- For roofs with many details and complex geometry when accessibility is limited
- For cost efficient life cycle extension of failing roofs
- For reflective coating to enhance energy efficiency by reducing cooling costs (Sikalastic®-590 White)
Advantages
- Good behavior under limited water ponding
- UV resistant and resistant to yellowing and weathering
- Highly elastic and crack-bridging
- Non-toxic and VOC compliant water based coating
- One component - ready to use
- Excellent adhesion on porous and non-porous substrates
- Seamless waterproofing membrane
- Water vapour permeable
Packaging
20 kg Plastic pails.
Colour
Grey and white
Product Details
Chemical Base
Polyurethane modified acrylic dispersion.
Shelf Life
12 months from date of production if stored properly in original,
unopened and undamaged sealed packaging.
Storage Conditions
The product must be stored properly in dry conditions at temperatures between +5 °C and +30 °C.
Density
~1.32 kg/L (at +30 °C) | (EN ISO 2811-1) |
System Structure
WATERPROOFING WITHOUT REINFORCEMENT
- For UV-stable coating for extend life old roofs or as reflective coating to enhance energy efficiency.
- For detail system build up, please refer to table below :
Coating System | Product | Consumption |
Primer coat | Sikalastic®-590 diluted with 10 % water | ~0.3 kg/m2 |
First coat | Sikalastic®-590 | ~0.5 kg/m2 |
Second coat | Sikalastic®-590 | ~0.5 kg/m2 |
WATERPROOFING WITH REINFORCEMENT (SIKALASTIC FLEECE)
- For cost efficient waterproofing solutions in new construction and refurbishment projects.
- Sikalastic Fleece is applied at areas with movements, irregular substrate or to bridge cracks, joints and seams on the substrate as well as for details.
- For detail system build up, please refer to table below :
Coating System | Product | Consumption |
Primer coat | Sikalastic®-590 diluted with 10 % water | ~0.3 kg/m2 |
First coat* | Sikalastic®-590 | ~0.3 kg/m2 |
Second coat | Sikalastic®-590 | ~0.5 kg/m2 |
Reinforcement membrane | Sikalastic Fleece | 1 m2 |
Third coat | Sikalastic®-590 | ~0.5 kg/m2 |
Final coat | Sikalastic®-590 | 0.3 - 0.5 kg/m2 |
* It may not be applied, if the substrate is good and the primer has covered substrate with proper consumption and enough material.
Tensile Strength
Free film (>7 days) | ~1.7 N/mm² |
Adhesion in Peel
Free film (>7 days) | ~1.5 N/mm2 |
Solar Reflectance
~80 % | Sikalastic®-590 White |
Thermal Emittance
~0.91 | Sikalastic®-590 White |
Solar Reflectance Index
~100.9 (at 12 W.m-2.K-1) | Sikalastic®-590 White |
Behaviour after Artificial Weathering
Pass, 1000 hours, UVA-340 no cracking, no blister, no delamination, no chalking | (ASTM G154) |
Application
Ambient Air Temperature
+15 °C min / +35 °C max
Relative Air Humidity
80 % r.h. max
Dew Point
Beware of condensation, Surface temperature during application must be at least 3 °C above dew point.
Substrate Temperature
+15 °C min / +35 °C max
Substrate Moisture Content
< 6 % moisture content.
No rising moisture according to ASTM (Polyethilene-sheet)
No water / moisture / condensation on the substrate.
Waiting Time / Overcoating
Before applying Sikalastic®-590 on Sikalastic®-590 diluted with 10 % water as primer, allow primer to dry:
Substrate Temperature | Relative Humidity | Minimum | Maximum |
+20 °C | 50 % | ~2 h | * Note 1 |
+30 °C | 50 % | ~1 h | * Note 1 |
Before applying Sikalastic®-590 on Sikalastic®-590 (without reinforced),
allow 1st coat to dry:
Substrate Temperature | Relative Humidity | Minimum | Maximum |
+20 °C | 50 % | ~6 h | * Note 1 |
+30 °C | 50 % | ~4 h | * Note 1 |
Before applying Sikalastic®-590 on Sikalastic®-590 (reinforced with
Sikalastic Fleece), allow material to dry:
Substrate Temperature | Relative Humidity | Minimum | Maximum |
+20 °C | 50 % | ~24 h | * Note 1 |
+30 °C | 50 % | ~12 h | * Note 1 |
*Note 1 : After thorough cleaning Sikalastic®-590 can be overworked with it self at any time
Applied Product Ready for Use
Substrate Temperature | Relative Humidity | Touch Dry | Rain Resistant | Fully Cured |
+20 °C | 50 % | ~2 h | ~10 h | ~4 d |
+30 °C | 50 % | ~1 h | ~6 h | ~2 d |
Note : Times are approximate and will be effected by changing ambient conditions particulary temperature and relative humidity. Low
temperature and high relative humidity retard curing, while high temperature and low relative air humidity accelerate curing progression.
SUBSTRATE PREPARATION
Cementitious Substrate:
- New concrete should be cured for at least 28 days and should have a Pull off strength ≥ 1.5 N/mm2.
- Cementitious or mineral based substrates must be prepared mechanically using abrasive blast cleaning or scarifying equipment to remove cement laitance and to achieve an open textured surface.
- Loose friable material and weak concrete must be completely removed and surface defects such as blowholes 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.
- High spots must be removed by e.g. grinding.
- Outgassing is a naturally occurring phenomenon of concrete that can produce pinholes in subsequently applied coatings. The concrete must be carefully assessed for moisture content, air entrapment, and surface finish prior to any coating work. Installing the membrane either when the concrete temperature is falling or stable can reduce outgassing. It is generally beneficial, therefore, to apply the embedment coat in the late afternoon or evening.
- Prime the substrate and always use a reinforced system.
Brick and stone:
Mortar joints must be sound and preferably flush pointed. Use localized reinforcement over joints and prime before applying Sikalastic®-590.
Slates, Tiles, etc.:
Ensure all slates/tiles are sound and securely fastened, replacing obviously broken or missing sections. Fully glazed tiles must be abraded prior to priming and subsequent treatment with Sikalastic®-590.
Bituminous Felt:
Ensure that bituminous felt is firmly adhered or mechanically fixed to the substrate. Bituminous felt should not contain any badly degraded areas. Prime and always use a totally reinforced system.
Bituminous Coatings:
Bituminous coatings should not have sticky or mobile surfaces, volatile mastic coatings, or old coal tar coatings. Prime and always use a totally reinforced system.
Metals:
Metals should be in sound condition. Abrade the exposed surfaces to reveal bright metal. Use locally reinforcement over joints and fixings.
Wooden substrates:
Timber and timber based panel roof decks are to be in good condition, firmly adhered, or mechanically fixed.
Paints/Coatings:
Ensure the existing material is sound and firmly adhered. Remove any oxidized layers and use localized reinforcement over joints.
MIXING
Prior to application, stir Sikalastic®-590 thoroughly for 1 minute in order to achieve a homogeneous mixture. Over mixing must be avoided to minimise air entrainment.
APPLICATION
Prior the application of Sikalastic®-590, the priming coat has to be used and it must have cured tack-free. The primer coat is Sikalastic®-590 diluted 10 % water and consumption is ~0.3 kg/m2
For the Waiting Time / Overcoating please refer to the PDS of the appropriate primer. Damageable areas (door frame) have to be protected with an adhesive tape.
Waterproofing WITHOUT Sikalastic Fleece:
Sikalastic®-590 is applied in three coats (1 coat is for primer coat & 2 coats are Sikalastic®-590). Prior to the application of second coat the indicated waiting time in the table Waiting Time / Overcoating shall be allowed.
Waterproofing WITH Sikalastic Fleece:
- Apply primer Sikalastic®-590 diluted with 10% water, consumption approximately 0.3 kg per m2.
- Apply first coat* of approximately 0.3 kg per m2.
- Apply second coat of approximately 0.5 kg/m2 of Sikalastic®-590. Work only so far in advance that the material stays liquid.
- Roll in the Sikalastic Fleece and push into the wet liquid and ensure full saturation. Overlapping of the Sikalastic Fleece a minimum 5 cm and ensure overlaps are sufficiently wet to bond. The roller may require only a little extra material to keep wetted but no further significant material needs to be added at this stage. The surface of the reinforcement should look wet and fully sealed. Then apply approximately 0.5 kg per m2 of Sikalastic®-590 with wet on wet system.
- Before applying the final coat, check for upstanding Reemat fibres. These fibres have to be eliminated by using sandpaper. Make sure that all upstanding fibres are abraded.
- After the coat is dry enough to walk on, Final coat of approximately 0.3 – 0.5 kg per m2 of Sikalastic®-590.
Note : * It may not be applied, if the substrate is good and the primer has covered substrate with proper consumption and enough material.
TOOLS
Drill and paddle:
Sikalastic®-590 should be mixed for one minute using a drill and paddle.
Solvent resistant short-piled lamb skin roller:
Used in the application of Sikalastic®-590 to ensure a consistent thickness of the seamless SikaRoof systems.
Thick hair brush:
For application of Sikalastic®-590 to all details and penetrations.
Jet Washer:
If dust, vegetation, moss / algae or other contaminants are present on the existing roof, a power washer is required to clean the substrate prior to the application of SikaRoof Systems. Existing chippings should be removed by hand or scabbling prior to power washing.
Airless spray equipment:
Used only for the roof coating systems. Two spray applied layers is the minimum requirement. The pump should have the following parameter:
-min. pressure : 220 bar
-min. output : 5.1 l/min
-min. Ø nozzle : 0.83 mm (0.033 inch)
For example : Wagner Heavycoat HC 940 E SSP Spray pack
CLEANING OF TOOLS
Clean all tools and application equipment with water immediately after use. Hardened/cured material can only be removed mechanically.