SikaRoof® i-Cure-18
Low odour UV-stable polyurethane liquid applied roof waterproofing system – 1,8 mm
SikaRoof® i-Cure-18 is a low odour, cold-applied, fabric reinforced, polyurethane liquid applied membrane roof waterproofing system. The system is highly elastic and UV-stable which provides a durable waterproofing solution. It incorporates Sika's unique i-Cure technology.
- The low-odour characteristics makes the system suitable for odour sensitive projects
- The fast curing provides early resistance to rain damage almost immediately on application
- A maintenance coat is easily applied when needed without the requirement to remove previous coats
- Thickness: ~1,8 mm
- Cold applied - requires no heat or flame
- Seamless finish
- Easily detailed around complex geometries
- Reinforced with Sika® Reemat Premium
- Good crack-bridging ability at low temperatures
- Retains flexibility at low temperatures
- Good adhesion to many substrates
- Vapour permeable
- Resistant to many common environmental influences
System Structure
Usage
The product can be used for the following roof waterproofing applications:- New construction and refurbishment projects
- Roofs with numerous details such as penetrations, drains, roof lights and complex geometry
- Failing roofs to extend the service life
- Cool and solar roofs when used in combination with Sikalastic®-641 TC (~ RAL 9016, available on indent)
- Sensitive areas requiring low odour
- Aluminium
- Brass
- Bitumen sheet membranes
- Bituminous coatings
- Bricks
- Cementitious substrates
- Concrete slabs
- Copper
- Existing Sikalastic® MTC System
- Galvanised steel
- Lead
- Ferrous metals
- Paints/coatings
- Single ply polymeric sheeting
- Stainless steel
- Stone
- Ceramic tiles
- Wood
- The System may only be used for exterior applications.
- The product is not suitable for permanent water immersion.
Advantages
- The low-odour characteristics makes the system suitable for odour sensitive projects
- The fast curing provides early resistance to rain damage almost immediately on application
- A maintenance coat is easily applied when needed without the requirement to remove previous coats
- Thickness: ~1,8 mm
- Cold applied - requires no heat or flame
- Seamless finish
- Easily detailed around complex geometries
- Reinforced with Sika® Reemat Premium
- Good crack-bridging ability at low temperatures
- Retains flexibility at low temperatures
- Good adhesion to many substrates
- Vapour permeable
- Resistant to many common environmental influences
Colour
Sikalastic®-631: Oxide Red (~RAL 3011)
Sikalastic®-641: Slate Grey (~RAL 7015)
Other colours available upon request.
System Details
APPROVALS / STANDARDS
- 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
- Fire testing EN 13501, Sikalastic®-641, Sikalastic®-631, Exova, Report No. WF 406986, WF 406987
- Fire Testing EN 13501-5, Sikalastic®-641, Sikalastic®-631, BRE, Report No.Q100348-1002 Issue 1 Q100348-1005 Issue 2
- Fire Testing BS 476, Sikalastic®-641, Sikalastic®-631, BRE, Report No.Q100348-1000 Issue 1, Q100348-1003 Issue 2
- Fire testing BS EN ISO 11925-2, Sikalastic®-641, Sikalastic®-631, Exova, Report No. 405551, 405552
- Fire Testing CEN/TS 118, Sikalastic®-641, Sikalastic®-631, BRE, Report No.Q100348-1001 Issue 1, Q100348-1004 Issue 2
- Annual QA sensory testing EN 13725, Sikalastic®-641, Sikalastic®-631, olfasense, Report No. SIKA21A0_01
- Water Vapour Transmission EN 1931, SikaRoof® i-Cure-18, 4ward, Report No. 2166
System Structure
SikaRoof® i-Cure-18
| Layer | Product | Consumption |
| 1. Primer | Depends on type of substrate | Refer to individual Product Data Sheet |
| 2. Base coat | Sikalastic®-631 | ≥ 1,0 l/m2 |
| 3. Reinforcement | Sika® Reemat Premium | - |
| 4. Top coat | Sikalastic®-641 | ≥ 1,1 l/m2 (≥ 1,6 kg/m2) |
IMPORTANT
The system structure layers as described in table must not be changed.
Note: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.
Composition
Aromatic & aliphatic polyurethanes
Dry film thickness
~1,8 mm
Tensile Strength
| ~10,2 N/mm2 | (EN ISO 527-3) |
Tear Strength
| ~25,5 N/mm | (EN ISO 6383-1:2004) |
Chemical Resistance
Sikalastic®-641 provides the chemical resistance.
Refer to Product Data Sheet.
Solar Reflectance Index
| ≥ 108 | (ASTM 1980-11) |
Value refers to the initial (properly cured, non-weathered) condition of Sikalastic®-641 white (~RAL 9016).
Service Temperature
-20 °C min. / +90 °C max.
Application
Ambient Air Temperature
+5 °C min. / +35 °C max.
Relative Air Humidity
20 % min. / 85 % max.
Dew Point
Beware of condensation.
The substrate and uncured applied layers must be at least +3 °C above dew point to reduce the risk of condensation or blooming on the membrane finish.
Substrate Temperature
+5 °C min / +60 °C max
Substrate Moisture Content
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
Waiting Time / Overcoating
Sikalastic®-641 on Sikalastic®-631:
| Ambient conditions | Minimum waiting time |
| +5 °C / 50 % r.h. | ~14 hours |
| +10 °C / 50 % r.h. | ~6–8 hours |
| +20 °C / 50 % r.h. | ~4 hours |
| +30 °C / 50 % r.h. | ~3 hours |
Note:After four days the surface of Sikalastic®-631 must be cleaned and primed with Sika® Reactivation Primer before applying Sikalastic®-641.
Note:Times are approximate and will be affected by changing ambient conditions, particularly temperature and relative humidity.
Applied Product Ready for Use
| Ambient conditions | Rain resistant | Touch dry | Full cure |
| +5 °C / 50 % r.h. | ~1 hour | ~10–12 hours | ~24 hours |
| +10 °C / 50 % r.h. | ~1 hour | ~6–8 hours | ~18–24 hours |
| +20 °C / 50 % r.h. | ~1 hour | ~4–6 hours | ~12–18 hours |
| +30 °C / 50 % r.h. | ~1 hour | ~3–5 hours | ~8–12 hours |
Note: After application, the product must be protected from heavy rain or rain showers until dry to prevent surface damage.
Note: Application at higher than recommended film thicknesses may result in a prolonged “soft” texture to the coating. This will eventually cure.
Times are approximate and will be affected by changing ambient conditions, particularly temperature and relative humidity.