Sikalastic®-618
Sikalastic®-618 is a one-component, cold applied, moisture-triggered polyurethane membrane. It cures to form a seamless and durable waterproofing solution for exposed roof areas and structures.
- Single component - No mixing, easy and ready to use
- Cold applied - requires no heat or flame
- Seamless membrane
- Compatible with Sika® Reemat Premium - easy to detail
- Easily recoated when needed - no stripping required
- Economic – provides a cost efficient life cycle extension of failing roofs
- Vapour permeable - allows substrate to breathe
- Elastic - retains flexibility even at low temperatures
- Good adhesion to most substrates – see table
- Fast curing - Free from rain damage almost immediately on application
Usage
- For roof waterproofing solutions in both new construction and refurbishment projects
- For roofs displaying complex detail areas, even when accessibility is limited
- For cost efficient life cycle extension of failing roofs
Advantages
- Single component - No mixing, easy and ready to use
- Cold applied - requires no heat or flame
- Seamless membrane
- Compatible with Sika® Reemat Premium - easy to detail
- Easily recoated when needed - no stripping required
- Economic – provides a cost efficient life cycle extension of failing roofs
- Vapour permeable - allows substrate to breathe
- Elastic - retains flexibility even at low temperatures
- Good adhesion to most substrates – see table
- Fast curing - Free from rain damage almost immediately on application
Packaging
15 l (~20.7 kg) metal pail
Colour
Cloud Grey (RAL 7045), Storm Grey (RAL 7011)
Product Details
APPROVALS / STANDARDS
- European Technical Assessment (No. ETA - 20/1016)
- CE marking and declaration of performance based on European Assessment document ETA-20/1016. (EAD) no. EAD 030350-00-0402 for Liquid applied roof waterproofing kits.
- Classification BROOF(t4) to BS EN 13501-5 on defined permutations of system build up
- Declaration of Performance No. 49622850
Chemical Base
One-component, moisture-triggered aromatic polyurethane
Shelf Life
9 months from date of production
Storage Conditions
The product must be stored properly in original, unopened and undamaged sealed packaging in dry conditions at temperatures >0 °C and <+25 °C.
Higher storage temperatures may reduce shelf life of product.
Reference shall also be made to the storage recommendations within the safety data sheet.
Density
~1.38 kg/l (23 °C) | (EN ISO 2811-1) |
Solid content by mass
~79 % (+23 °C / 50 % r.h.)
Solid content by volume
~67 % (+23 °C / 50 % r.h.)
System Structure
Reinforced Roof Waterproofing
Sikalastic®-618 is applied in one coat reinforced with Sika® Reemat Premium and sealed with a further coat of Sikalastic®-618
| Layer | Product | Consumption |
| 1. Primer | please refer to substrate pre-treatment | please refer to PDS of the Primer |
| 2. Base coat | Sikalastic®-618 | ≥ 1.0 l/m2 |
| 3. Reinforcement | Sika® Reemat Premium | - |
| 4. Top coat | Sikalastic®-618 | ≥ 0.75 l/m2 |
Note: These figures are theoretical and do not include for any additional material required due to surface porosity, surface profile, variations in level and wastage.
Tensile Strength
Not Reinforced | Reinforced |
~ 4.6 N/mm2 | ~ 18 N/mm2 |
External Fire Performance
On non-combustible substrates | BRoof (t1) / BRoof (t4) |
Over built up roofing system | BRoof (t1) / Broof (t2) |
Reaction to Fire
Euroclass E |
Ext F.AA rating Non Combustible substrates |
Service Temperature
–20 °C min./ +90 °C max.
Application
Ambient Air Temperature
+5 °C min. / +40 °C max.
Relative Air Humidity
5 % r.h. min. / 85 % r.h. max.
Substrate Temperature
+5 °C min. / +60 °C max.
≥ 3 °C above dew point
Substrate Moisture Content
≤ 4 % pbw moisture content.
Test method: Sika®-Tramex meter
No rising moisture according to ASTM (Polyethylene-sheet).
Substrates
For applications onto podium decks, please consult Roofing Technical Services.
Pot Life
Sikalastic®-618 is designed for fast drying. High temperatures combined with high air humidity will increase the curing process. Thus, material in opened containers should be applied immediately. In opened containers, the material will form a film after 1 hour approx. (+20 °C / 50 % r.h.)
Waiting Time / Overcoating
| Ambient conditions | Minimum waiting time* |
| +5 °C / 50 % r.h. | 18 hours |
| +10 °C / 50 % r.h. | 8 hours |
| +20 °C / 50 % r.h. | 6 hours |
| +30 °C / 50 % r.h. | 4 hours |
Note: Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.
After four days the surface must be cleaned and primed with Sika® Reactivation Primer before continuing.
Applied Product Ready for Use
Ambient conditions | Rain resistant* | Touch dry | Full cure |
+5 °C / 50 % r.h. | 10 minutes | 10 hours | 19 hours |
| +10 °C / 50 % r.h. | 10 minutes | 6 hours | 10 hours |
+20 °C / 50 % r.h. | 10 minutes | 4.5 hours | 6 hours |
+30 °C / 50 % r.h. | 10 minutes | 2 hours | 4 hours |
*Be aware that impact of heavy rain or rain showers can physically damage the still liquid membrane.
Note: Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.
SUBSTRATE PREPARATION
The surface must be sound, of sufficient strength, clean, dry and free of dirt, oil, grease and other contamination. Depending on the material the substrate must be primed or mechanically cleaned. Grinding may be necessary to level the surface. Suitable substrates are such as: concrete, bituminous felts and coatings, metal, brickwork, asbestos cement, ceramic tiles, wooden substrates.
For detailed information regarding substrate preparation and primer chart please refer to Method Statement No. 850 915 09.
MIXING
Mixing is not required, however if the product is settled or separated on opening, stir Sikalastic®-618 gently but thoroughly in order to achieve a uniform colour. Stirring gently will minimise air entrainment.
APPLICATION
Prior the application of Sikalastic®-618 the priming coat if used must have cured tack-free. For the Waiting Time / Overcoating please refer to the PDS of the appropriate primer. Damageable areas (handrails, etc) have to be protected with tape or plastic wrapping.
Roof Coating:
Sikalastic®-618 is applied in two coats. Prior to the application of a 2nd coat the indicated waiting time in the table Waiting Time / Overcoating shall be allowed.
Roof coatings may need partial reinforcement over areas of stress or predictable movement eg joints overlaps detailing etc. Use Strips or sections of Sika Reemat Premium for reasonably sound surfaces –asbestos cement etc. For joints with moderate movement eg Metal Sheeting use Sika Flexitape Heavy incorporating bond-break
Reinforced Roof Waterproofing:
Sikalastic®-618 is applied in combination with Sika Reemat Premium.
- Apply first coat of approximately 1 l/m2 of Sikalastic®-618. Work only so far in advance that the material stays liquid.
- Roll in the Sikalastic® Reemat Premium. Overlap it a minimum 5 cm and ensure overlaps are sufficiently wet to bond both layers.
- The roller may require only a little extra material to keep wetted but no further significant material needs to be added at this stage.
- After the coat is dry enough to walk on, seal the roof area with second coat of Sikalastic®-618 at a minimum 0.75 l/m2 per coat.
Please note, always begin with details prior starting with waterproofing the
horizontal surface. For details follow step 1-4.
CLEANING OF TOOLS
Clean all tools and application equipment with Thinner C immediately after use. Hardened and/or cured material can only be removed mechanically.