Sikalastic®-612
Sikalastic®-612 is a one-component, cold applied, moisture-triggered polyurethane waterproofing membrane. It cures to form a seamless and durable waterproofing solution for exposed roof areas and structures, as well as below tiles on balconies and terraces.
- One-component - no mixing, easy and ready to use
- Cold applied - requires no heat or flame
- Seamless membrane
- Can be reinforced where required
- 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
- For waterproofing underneath tiles bonded with adhesives on balconies and terraces
Advantages
- One-component - no mixing, easy and ready to use
- Cold applied - requires no heat or flame
- Seamless membrane
- Can be reinforced where required
- 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
5 l (~7.1 kg) and 15 l (~21.3 kg) metal pails
Colour
White (RAL 9010), grey (RAL 7032), terracotta, other colours available upon request
Product Details
APPROVALS / STANDARDS
- Liquid applied roof waterproofing kit according to ETAG 005, ETA-12/01278 issued by technical assessment body British Board of Agrément, Declaration of Performance 80192223, provided with the CE marking
- Liquid-applied water impermeable product for external installations beneath ceramic tiling according to DIN EN 14891:2012-07, Declaration of Performance 28643599, assessed by notified laboratory 0761, and provided with the CE marking.
- External fire performance according to ENV 1187: Broof (t1)
- Reaction to fire according to EN13501-1 : Euroclass E
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 between 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
~1.42 kg/l (23 °C) | (EN ISO 2811-1) |
Solid content by weight
~80 % (+23 °C / 50 % r.h.)
Solid content by volume
~68 % (+23 °C / 50 % r.h.)
System Structure
Roof Coating*
Sikalastic®-612 is applied in 1 or 2 coats
| Total consumption | ≥ 0.7 - 2.0 l/m2 (≥ 1.0 -2.8 kg/m2) |
| Dry film thickness | ≥ 0.7 - 1.4 mm |
*For partial reinforcement Sikalastic® Fleece-120 or Sikalastic® Flexitape Heavy is applied at areas with high movement, irregular substrate or to bridge cracks, joints and seams on the substrate as well as for details. On bitumen felt a fully reinforced roof waterproofing system has to be applied.
For primer, please refer to the Substrate Pre-Treatment table below.
Reinforced Roof Waterproofing
Sikalastic®-612 is applied in one coat reinforced with Sikalastic® Fleece-120 and sealed with a further coat of Sikalastic®-612
| Layer | Product | Consumption |
| 1. Primer | please refer to substrate pre-treatment | please refer to PDS of the Primer |
| 2. Base coat | Sikalastic®-612 | ≥ 1.0 l/m2 |
| 3. Reinforcement | Sikalastic® Fleece-120 or Reemat Premium | - |
| 4. Top coat | Sikalastic®-612 | ≥ 1.0 l/m2 (≥ 1.4 kg/m2) |
Waterproofing below tiles bonded with tile adhesive*
Sikalastic®-612 is applied on concrete or screed in two coats, followed with one more coat of Sikalastic®-612 broadcasted with quartz sand.
| Layer | Product | Consumption |
| 1. Primer | Sika® Concrete Primer or Sika® BondingPrimer | please refer to PDS of the Primer |
| 2. Base coat | Sikalastic®-612 | ≥ 1.0 l/m2 (≥ 1.4 kg/m2) |
| 4. Top coat | Sikalastic®-612 | ≥ 1.0 l/m2 (≥ 1.4 kg/m2) |
| 5. Bonding bridge | Sikalastic®-612 broadcasted with 2 kg /m2 quartz sand (ø 0.4 - 0.7 mm)** | ≥ 0.2 l/m2 (≥ 0.2 kg/m2) |
| 6. Tile adhesive | SikaCeram®-205 Xtra Large | please refer to PDS of the tile adhesive |
*For partial reinforcement Sikalastic® Fleece-120 or Sikalastic® Flexitape Heavy is applied at areas with high movement, irregular substrate or to bridge cracks, joints and seams on the substrate as well as for details.
**Excessive sand has to be removed after the liquid applied membrane has been cured.
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
| Unreinforced | Reinforced |
| ~4.5 N/mm2 | ~8 N/mm2 |
Service Temperature
–20 °C min. / +80 °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.
Minimum 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).
Substrate Pre-Treatment
| Substrate | Primer |
| Cementitious substrates | Sika® Concrete Primer |
| Brick and Stone | Sika® Concrete Primer Sika® Bonding Primer |
| Ceramic tiles (unglazed), and concrete slaps | Sika® Concrete Primer Sika® Bonding Primer |
| Bituminous felt & coating | 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 use Sika® Concrete Primer or Sika Bonding Primer. |
| Paints | Subject to adhesion and compatibility tests |
| Existing SikaRoof® MTC System | Sika® Reactivation Primer |
For the consumption rates and waiting time / overcoating please refer to the PDS of the appropriate cleaner and primer. Other substrates must be tested for their compatibility. If in doubt, apply a test area first.
Pot Life
Sikalastic®-612 is designed for fast curing. High temperatures combined with high air humidity will accelerate 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. | 12 hours |
| +20 °C / 50 % r.h. | 6 hours |
| +30 °C / 50 % r.h. | 4 hours |
*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 resistant* | Touch dry | Full cure |
+5 °C / 50 % r.h. | 10 minutes | 8 hours | 18 hours |
| +10 °C / 50 % r.h. | 10 minutes | 6 hours | 10 hours |
+20 °C / 50 % r.h. | 10 minutes | 4 hours | 7 hours |
+30 °C / 50 % r.h. | 10 minutes | 2 hours | 5 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 08.
MIXING
Mixing is not required, however if the product is settled or separated on opening, stir Sikalastic®-612 gently but thoroughly in order to achieve a uniform colour. Stirring gently will minimise air entrainment.
APPLICATION
Prior the application of Sikalastic®-612 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 Coatings:
Sikalastic®-612 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 e.g. joints, overlaps, detailing etc. Use Strips or sections of Sikalastic® Fleece-120 for reasonably sound surfaces –asbestos cement etc. For joints with moderate movement e.g. Metal Sheeting use Sika® Flexitape Heavy incorporating bond-break.
Reinforced Roof Waterproofing:
Sikalastic®-612 is applied in combination with Sikalastic® Fleece 120. Over coating of bitumen felt has to be full reinforced.
- Apply first coat of approximately 1.3 l/m2 of Sikalastic®-612. Work only so far in advance that the material stays liquid.
- Roll in the Sikalastic® Fleece-120 and ensure that there are no bubbles or creases. Overlapping of the fleece a minimum 5 cm and ensure overlaps are sufficiently wet to bond.
- 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®-612 at a minimum 0.7 l/m2 per coat.
Please note, always begin with details prior starting with waterproofing the horizontal surface. For details follow step 1-4.
Waterproofing below tiles:
For waterproofing below tiles, follow the instruction for roof coatings. After the last coat of the waterproofing system has been cured, apply another coat of Sikalastic®-612 broadcasted with quartz sand. (Ø 0.4 - 0.7 mm) as bonding bridge. Remove excessive sand after the liquid applied membrane has cured. For application of the tile adhesive, please refer to the product data sheet of the tile adhesive.
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.