Sikalastic®-851 R
Two-component spray applied roof waterproofing membrane
Sikalastic®-851 R is a two component, elastic, crack-bridging, rapid-curing modified polyurethane/ polyurea-hybrid membrane. Sikalastic®-851 R is applied by two compontent hot spray equipment.
- Solvent free
- Fast application - application with 2-part hot spray equipment
- Fast curing - over coating with top coat possible after approx. 10 minutes
- Seamless waterproofing membrane
- High Solids - contains no fillers
- Excellent crack-bridging properties
- Highly elastic and crack bridging
- Low viscosity
- Water vapour permeable – allows the substrate to breathe
- Good adhesion to most substrates
- 12 months shelf life
Usage
- For use as a waterproofing membrane on flat and pitched roof structures with additional top coat for UV-protection for exposed roofs.
- For use as a waterproofing membrane underneath planting or hard landscaping on podium areas.
- For use as a waterproofing membrane for other concrete structures and on non-trafficked concrete areas with an additional top coat for UV-protection.
Advantages
- Solvent free
- Fast application - application with 2-part hot spray equipment
- Fast curing - over coating with top coat possible after approx. 10 minutes
- Seamless waterproofing membrane
- High Solids - contains no fillers
- Excellent crack-bridging properties
- Highly elastic and crack bridging
- Low viscosity
- Water vapour permeable – allows the substrate to breathe
- Good adhesion to most substrates
- 12 months shelf life
Packaging
Component A | 211 kg drum |
Component B | 202 kg drum |
Colour
Component A (ISO) | clear / brownish |
Component B (Resin) | grey or yellowish |
Mixed product: grey ~ca. RAL 7004
Product Details
ENVIRONMENTAL INFORMATION
Conformity with LEED v2009 IEQc 4.2: Low-Emitting Materials - Paints and Coatings
APPROVALS / STANDARDS
-
Test report for root resistance following DIN 4062: report No.: P9638-1-E dated 29/05/2015
-
Test report for crack bridging properties following DIN EN 1062-7: report No.: P 9638-2-E dated 29/05/2015
-
Test report for fire classification according to EN 13501-1, following test method DIN EN ISO 11925-2,: report No. 903 0526000-2 dated 15/8/2015; reaction to fire performance: class E
Chemical Base
Modified Polyurethane/ Polyurea-Hybrid
Shelf Life
Component A | 12 months from date of production |
Component B | 12 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 +5 °C and +30 °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
Component A | ~1,08 kg/l |
Component B | ~1,04 kg/l |
Mixed resin | ~1,00 kg/l (cured film) |
All density values at +23 °C
Viscosity
Component A | ~2300 mPa·s at +20 °C |
Component B | ~2300 mPa·s at +20 °C |
System Structure
Exposed Roof Waterproofing
Sikalastic®-851 R is applied in one coat and sealed with one coat Sikalastic®-621 or Sikalastic®-445
Layer | Product | Consumption |
1. Primer | please refer to substrate pre-treatment | please refer to PDS of the primer |
2. Waterproofing | Sikalastic®-851 R | ≥ 1,6 kg/m2 |
3. UV Protection | Sikalastic®-621 or Sikalastic®-445 | ≥ 1,0 kg/m2 |
Non-Exposed Roof Waterproofing
Sikalastic®-851 R is applied in one or two coats
Layer | Product | Consumption |
1. Primer | please refer to substrate pre-treatment | please refer to PDS of the primer |
2. Waterproofing | Sikalastic®-851 R | ≥ 2,1 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.
Shore A Hardness
Temperature | After 1 hour | After 24 hours | After 28 days |
+8 °C | ~81 | ~88 | ~88 |
+23 °C | ~83 | ~88 | ~88 |
Resistance to Root Penetration
free of penetration of the roots free of growth into the ground
Tensile Strength
~11,0 N/mm2 (28 days / +23 °C) | (DIN 53504) |
Crack Bridging Ability
Dynamic crack-bridging class | B 4.2 |
Static crack-bridging class | A 5 |
Thermal Resistance
Sikalastic®-851 R is short term resistant to mastic asphalt (hot poured asphalt) applied at a max. of +240 °C.
Sikalastic®-851 R elastic properties are maintained at temperatures as low as -30 °C.
Chemical Resistance
Sikalastic®-851 R is generally resistant to:
Bitumen
Alkalis
Reaction to Fire
Euroclass E
Dry film thickness
Exposed Roof Waterproofing
Waterproofing | ~1,6 mm |
UV Protection | ~0,5 mm |
Total | ~2,0 mm |
Non-Exposed Roof Waterproofing
Waterproofing | ~2,1 mm |
Application
Mixing Ratio
Component A : Component B = 1 : 1 (by volume)
Component A : Component B = 1,04 : 1 (by weight)
Product Temperature
Component A | +70–80 °C |
Component B | +65–70 °C |
Hose | +65–70 °C |
Ambient Air Temperature
+8 °C min. / +50 °C max.
Relative Air Humidity
80 % r.h. max
Substrate Temperature
+8 °C min. / +55 °C max.
≥3 °C above dew point
Substrate Moisture Content
≤ 4 % pbw moisture content. Test method: Sika®-Tramex meter, CM - measurement on Oven-dry method No rising moisture according to ASTM (Polyethylene-sheet).
Waiting Time / Overcoating
Before applying Sikalastic®-851 R on Sikafloor®-161 allow:
Substrate temperature | Minimum waiting time | Maximum waiting time1 |
+10 °C | 24 hours | 1 month |
+20 °C | 12 hours | 1 month |
+30 °C | 8 hours | 1 month |
+45 °C | 6 hours | 1 month |
Before applying Sikalastic®-851 R on Sikalastic®-851 R allow:
Substrate temperature | Minimum waiting time | Maximum waiting time2 |
+10 °C | 4 minutes | 3 hours |
+20 °C | 4 minutes | 3 hours |
+30 °C | 4 minutes | 1 hour |
+45 °C | 4 minutes | 1 hour |
Before applying Sikalastic®-621 or Sikalastic®-445 on Sikalastic®-851 R allow:
Substrate temperature | Minimum waiting time | Maximum waiting time2 |
+10 °C | 10 minutes | 24 hours |
+20 °C | 10 minutes | 24 hours |
+30 °C | 10 minutes | 24 hours |
+45 °C | 10 minutes | 24 hours |
1 Assuming that any dirt has been carefully removed and any contamination is avoided.
2 If the maximum waiting time is exceeded, Sika® Concrete Primer has to be applied with a consumption rate of 100 g/m2 as an adhesion promoter between the layers.
Note: Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.
Applied Product Ready for Use
Rain resistant after | Ready for foot traffic1 (careful) | Ready for foot traffic | Ambient conditions |
~5 minutes | ~8 minutes | ~24 hours | +10 °C |
~5 minutes | ~5 minutes | ~18 hours | +20 °C |
~5 minutes | ~4 minutes | ~14 hours | +30 °C |
~5 minutes | ~4 minutes | ~12 hours | +45 °C |
1Only for inspection or for application of next layer.
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.
For detailed information regarding substrate preparation and primer chart please refer to Method Statement No. 850 915 11.
MIXING
Dose and mix with suitable two-component spray equipment. Maintain recommended product and hose temperature.
Recomended pressure:
Component A + B 160–180 bar.
Ensure equal pressure of component A + B. The accuracy of pressure, mixing and dosage must be controlled regularly with the equipment.
APPLICATION
Prior the application of Sikalastic®-851 R 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.
Waterproofing:
Spray apply Sikalastic®-851 R with suitable two-component hot spray equipment. Possible suppliers of spray equipment are Gama, Graco, Isotherm, WiWa, Reaku etc.
UV Protection:
One layer of Sikalastic®-621 or Sikalastic®-445 applied either by roller or airless spray. For more detailed application engineering information pls. refer to the appropriate method statement.
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.