SikaRoof® MTC-20 UV
High performance, UV-stable liquid applied polyurethane roof waterproofing system
SikaRoof® MTC-20 UV is a cold-applied, seamless, highly elastic and UV-stable moisture triggered polyurethane roof waterproofing system consisting of Sikalastic®- 488 and Sikalastic®- 701. Suitable for use in hot and tropical climatic conditions.
- Aliphatic topcoat, resistant to UV exposure, color stable
- Highly reflective (RAL 9016) and resistant to yellowing and low dirt pick up
- Highly elastic and crack-bridging even at low temperatures
- Resistant to long term ponding water
- Cold applied system– requires no heat or flame
- Easily recoated – no stripping required
- Seamless membrane and water vapour permeable
- Good resistance to common atmospheric chemicals
- Top coat available in white and grey
Usage
SikaRoof® MTC-20 UV may only be used by experienced professionals. SikaRoof® MTC-20 UV 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
Advantages
- Aliphatic topcoat, resistant to UV exposure, color stable
- Highly reflective (RAL 9016) and resistant to yellowing and low dirt pick up
- Highly elastic and crack-bridging even at low temperatures
- Resistant to long term ponding water
- Cold applied system– requires no heat or flame
- Easily recoated – no stripping required
- Seamless membrane and water vapour permeable
- Good resistance to common atmospheric chemicals
- Top coat available in white and grey
Product Details
APPROVALS / CERTIFICATES
- AS 4654.1-2012: Sikalastic® 488 (base coat membrane)
- Fire Testing EN 13501-1, Sikalastic®-701, Sikalastic®-702, warringtonfire, Report No.19896B
- ASTM D7896- Solar reflective index/ Thermal emmitance testing- Sikalastic®-701
System structure
Standard SikaRoof® MTC-20 UV application without non-slip addition:
| Layer | Product | Required DFT |
| 1. Primer | Sikalastic® Moisture Seal or Sikalastic®- 100 EP Primer | Please refer to PDS of the Primer |
| 2. Base coat | Sikalastic®- 488 | 2.0mm DFT |
| 3. Top coat | Sikalastic®- 701 | 0.22mm DFT |
SikaRoof® MTC-20 UV application with non-slip addition:
| Layer | Product | Required DFT |
| 1. Primer | Sikalastic® Moisture Seal or Sikalastic®- 100 EP Primer | Please refer to PDS of the Primer |
| 2. Base coat | Sikalastic®- 488 | 2.0mm DFT |
| 3. Top coat | Sikalastic®- 701 | 0.22mm DFT |
| 3. Aggregate | 20-40 mesh aggregate | 0.5-1kg/m2 |
| 4. Top coat | Sikalastic®- 701 | 0.22mm DFT |
Aggregate:
Aggregate is to applied to the first top coat (Layer 3) immediately after application. Use clean, rounded or semi-angular oven dried quartz sand with a size gradation of 20–40 mesh and a minimum hardness of 6.5 per Moh’s scale for pedestrian traffic. Seeding of aggregate means an even light broadcast short of refusal. A full broadcast of aggregate means a heavy application to refusal. Any loose aggregate must be removed prior to recoating, back roll aggregate where required.
Dry film thickness
Sikalastic®- 100 EP Primer: 0.20mm approx
Sikalastic®-488: 2.0mm DFT
Sikalastic®-701: 0.22mm DFT
Total system: Approx. 2.44mm DFT
(Approx. 2.8mm DFT if using non-slip additive with additional top coat)
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 meter
No rising moisture according to ASTM (Polyethylene sheet).
Waiting time to overcoating
Please refer to individual data sheets of primer, Sikalastic® -488 and Sikalastic® -701 for overcoat time frames
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 and mechanically cleaned. Grinding may be necessary to level the surface. Suitable substrates are such as: concrete, existing coatings (after adhesion and compatibility testing is confirmed) , metal, brickwork, asbestos cement, ceramic tiles.
APPLICATION
Prior the application of SikaRoof® MTC-20 UV 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. Please note, always begin with details prior to the installation of the horizontal surface.
1. Apply first coat of Sikalastic®-488. Please refer to the Sikalastic®-488 product data sheet for application rates and drying times; 3 coats will be required to acheive the DFT of 2.0mm
2. Apply the top coat of Sikalastic®-701. If a non-slip finish is required, two coats will need be installed with the non-slip finish being broadcast into the first coat of Sikalastic®-701. Once first coat is cured, the coating should be broomed/vacummed of excess material and the subsequent top coat applied within 24 hours.
CLEANING OF EQUIPMENT
Clean all tools and application equipment with Thinner C immediately after use. Hardened and/or cured material can only be removed mechanically.