SikaRoof® MTC-18
SikaRoof® MTC-18 is a cold-applied, seamless, highly elastic and UV-stable moisture triggered polyurethane roof waterproofing system consisting of Sikalastic®-601 BC, Sika® Reemat Premium and Sikalastic®-621 TC. Suitable for use in hot and tropical climatic conditions.
- Proven technology - over 25 year track record
- One component - no mixing, easy and ready to use
- UV resistant - Highly reflective (RAL 9016) and resistant to yellowing
- Cold applied - requires no heat or flame
- Seamless roof waterproofing membrane
- Compatible with Sika® Reemat Standard - easy to detail
- Fast curing - free from resin damage almost immediately on application
- High elastic and crack-bridging - retains flexibility even at low temperatures
- High root resistance
- Easily re-coated when needed - no stripping required
- Good adhesion to most substrates - see primer chart
- Vapour permeable - allows substrate to breathe
- Strong resistance to common atmospheric chemicals
System Structure
Usage
SikaRoof® MTC-18 can be used as following:- Roof waterproofing solution for new construction and refurbishment projects
- For roofs displaying complex detail areas and geometry, even when accessibility is limited
- For cost efficient life cycle extension of failing roofs In combination with Sikalastic®-621 TC – SR (traffic white RAL 9016) for cool roofs and solar roofs
Advantages
- Proven technology - over 25 year track record
- One component - no mixing, easy and ready to use
- UV resistant - Highly reflective (RAL 9016) and resistant to yellowing
- Cold applied - requires no heat or flame
- Seamless roof waterproofing membrane
- Compatible with Sika® Reemat Standard - easy to detail
- Fast curing - free from resin damage almost immediately on application
- High elastic and crack-bridging - retains flexibility even at low temperatures
- High root resistance
- Easily re-coated when needed - no stripping required
- Good adhesion to most substrates - see primer chart
- Vapour permeable - allows substrate to breathe
- Strong resistance to common atmospheric chemicals
Packaging
Please refer to individual Product Data Sheet
Colour
Sikalastic®-601 BC: Oxide red (RAL 3011)Sikalastic®-621 TC: Slate grey (RAL 7015), shale grey (RAL 8500), traffic white (RAL 9016), other colours available upon request
System Details
APPROVALS / CERTIFICATES
- Liquid applied roof waterproofing kit according to ETAG 005, ETA-09/0139 issued by technical assessment body British Board of Agrément (BBA), Declaration of Performance 15813688, provided with the CE marking
- External fire performance: BRoof(t1), BRoof(t2), BRoof(t3)
- Reaction to fire according to EN 13501-1: Euroclass E
System Structure
Sikalastic®-601 BC applied in 1 coat, reinforced with Sika® Reemat Premium and sealed with 1 coat Sikalastic®-621 TC
Layer | Product | Consumption |
1. Primer | Please refer to substrate pre-treatment | Please refer to PDS of the Primer |
2. Base coat | Sikalastic®-601 BC | ≥ 1.0 l/m2 (≥ 1.4 kg/m2) |
| 3. Reinforcement | Sika® Reemat Premium | - |
4. Top coat | Sikalastic®-621 TC | ≥ 1.1 l/m2 (≥ 1.6 kg/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.
Composition
Moisture-triggered aliphatic polyurethane
Shelf life
Please refer to individual Product Data Sheet
Storage conditions
Please refer to individual Product Data Sheet
Dry film thickness
~1.8 mm
Tensile Strength
~12.1 N/mm2 | (EN ISO 527-3) |
Tear Strength
~47 N/mm2 | (EN ISO 6383-1:2004) |
Permeability to Water Vapour
μ: ~3 600 | (EN ISO 1931 Method B) |
External Fire Performance
BRoof (t1), BRoof (t2), BRoof (t3) | (EN 13501-5) |
Reaction to Fire
Euroclass E | (EN 13501-1) |
Chemical Resistance
| Salt spray | 1000 h continuous exposure |
| Prohesion testing | 1000 h cyclic exposure |
Strong resistance to a wide range of reagents including paraffin, petrol, fuel oil, white spirit, acid rain, detergents and moderate solutions of acids and alkalis. Some low molecular weight alcohols can soften the material. Contact Sika Technical Department for specific information.
Solar Reflectance Index
≥ 109* | (ASTM 1980) |
* All values refer to the initial (properly cured, non-weathered) status of Sikalastic®-621 TC white (RAL 9016).
Service Temperature
–30 °C min. / +80 °C max.
Application
Ambient Air Temperature
+5 °C min. / +35 °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 meterNo rising moisture according to ASTM (Polyethylene-sheet).
Substrate Pre-Treatment
Substrate | Primer |
Cementitious substrates | Sika® Concrete Primer or Sika® Bonding Primer |
Brick & Stone | Sika® Concrete Primer or Sika® Bonding Primer |
| Ceramic tiles (unglazed), and concrete slabs | Sika® Concrete Primer or Sika® Bonding Primer |
| Bituminous felt & coating | Normally not required Sikalastic® Metal Primer* |
Metals Ferrous or galvanised metals, lead, copper, aluminium, brass or stainless steel | Sikalastic® Metal Primer |
| Wooden substrates | Timber based roof decks require a complete layer of Sikalastic® Carrier. For small exposed timber sections: Sika® Concrete Primer or Sika® Bonding Primer |
| Paints & Coatings | Subject to adhesion and compatibility tests |
| Existing Sikalastic® MTC System | Sika® Reactivation Primer |
Single ply membranes | Consult Sika Technical Department |
*Sikalastic® Metal Primer prevents migration of bituminous volatiles and improves long-term reflectivity.
For the consumption rates and waiting time / overcoating you please refer to the Product Data Sheet of the appropriate cleaner and primer. Other substrates must be tested for their compatibility. If in doubt, apply a test area first.
Waiting Time / Overcoating
| Ambient conditions | Minimum waiting time |
+5 °C / 50 % r.h. | 18 h |
+10 °C / 50 % r.h. | 8 h |
| +20 °C / 50 % r.h. | 6 h |
After four days the surface must be cleaned and primed with Sika® Reactivation Primer before continuing.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 resistance | Touch dry | Full cure |
+5 °C / 50 % r.h. | 10 min* | 8 – 12 h | 16 – 24 h |
+10 °C / 50 % r.h. | 10 min* | 4 h | 8 – 12 h |
+20 °C / 50 % r.h. | 10 min* | 3 h | 6 – 8 h |
* 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.
MIXING
Mixing is not required, however if the product is settled or separated on opening, stir gently but thoroughly in order to achieve a uniform colour. Stirring gently will minimise air entrainment.
APPLICATION
Prior the application of SikaRoof® MTC-18 the priming coat if used must have cured tack-free. For the Waiting Time / Overcoating please refer to the Product Data Sheet of the appropriate primer. Damageable areas (handrails etc). have to be protected with tape or plastic wrapping.Please note, always begin with details prior to the installation of the horizontal surface.
CLEANING OF EQUIPMENT
Clean all tools and application equipment with Thinner S immediately after use. Hardened and/or cured material can only be removed mechanically.