SikaRoof® MTC-12 UV
High performance, UV-stable liquid applied polyurethane roof waterproofing system
SikaRoof® MTC-12 UV is a cold-applied, seamless, highly elastic and UV-stable moisture triggered polyurethane roof waterproofing system consisting of Sikalastic®- 488 and Sikalastic®-622 Excel Top PLUS. Suitable for use in hot and tropical climatic conditions.
- One component - no mixing, easy and ready to use
- UV resistant - good resistantance to yellowing
- Cold applied - requires no heat or flame
- Seamless roof waterproofing membrane - easy to detail
- Fast curing - free from resin damage almost immediately on application
- High elastic and crack-bridging - retains flexibility even at low temperatures
- Good adhesion to most substrates - see primer chart
- Vapour permeable - allows substrate to breathe
- Strong resistance to common atmospheric chemicals
Usage
SikaRoof® MTC-12 UV may only be used by experienced professionals. SikaRoof® MTC-12 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
- One component - no mixing, easy and ready to use
- UV resistant - good resistantance to yellowing
- Cold applied - requires no heat or flame
- Seamless roof waterproofing membrane - easy to detail
- Fast curing - free from resin damage almost immediately on application
- High elastic and crack-bridging - retains flexibility even at low temperatures
- Good adhesion to most substrates - see primer chart
- Vapour permeable - allows substrate to breathe
- Strong resistance to common atmospheric chemicals
Product Details
APPROVALS / CERTIFICATES
AS 4654.1-2012: Sikalastic® 488 (base coat membrane)
AS 4654.1-2012: Sikalastic® 622 Excel Top PLUS (top coat membrane)
System structure
Standard SikaRoof® MTC-12 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 | 1.2mm DFT |
| 3. Top coat | Sikalastic® -622 Excel Top PLUS | 0.35mm DFT |
SikaRoof® MTC-12 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 | 1.2mm DFT | |
| 3. Top coat | Sikalastic® -622 Excel Top PLUS | 0.35mm DFT | |
| 3. Aggregate | 20-40 mesh aggregate | 0.5-1kg/m2 | |
| 4. Top coat |
| 0.35mm 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®-488: 1.2mm DFT
Sikalastic®-622 Excel Top PLUS: 0.35mm DFT
Total system: 1.55mm DFT
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® -622 Excel Top PLUS 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-12 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; 2 coats will be required to acheive the DFT of 1.2mm
2. Apply the top coat of Sikalastic®-622 Excel Top PLUS. 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®-622 Excel Top PLUS. 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.