Sikalastic®-625 BMS
High performance reduced CO2 footprint polyurethane liquid applied waterproofing
Sikalastic®-625 BMS is a 1-part polyurethane, reinforced, cold-applied liquid membrane. It provides a flexible, seamless waterproofing solution using Sika's unique i-Cure technology and selected sustainable raw materials derived from renewable sources, thereby reducing the product's carbon footprint.
- 1-Part ready to use
- Low maintenance
- Seamless
- Easy and quick application by brush, roller or spray
- Suitable for light foot traffic areas (maintenance walkways)
- Vapour permeable
- Good UV resistance and colour stability
- Retains flexibility at low temperatures
- Cold applied - requires no heat or flame
- Moisture triggered technology develops early rain resistance
- Low odour and renewable raw materials content
- Good elastic properties
Usage
Designed for the following waterproofing applications:- Roof waterproofing for new construction and refurbishment projects
- Reinforced waterproofing of flat and pitched roof structures
- Waterproofing structures with numerous details such as penetrations, drains, roof lights and complex geometry
- Waterproofing existing substrates of concrete, bituminous felt and coatings, brick, stone, asbestos cement, metal, wood, unglazed ceramic tiles
- For exterior use only
Advantages
- 1-Part ready to use
- Low maintenance
- Seamless
- Easy and quick application by brush, roller or spray
- Suitable for light foot traffic areas (maintenance walkways)
- Vapour permeable
- Good UV resistance and colour stability
- Retains flexibility at low temperatures
- Cold applied - requires no heat or flame
- Moisture triggered technology develops early rain resistance
- Low odour and renewable raw materials content
- Good elastic properties
Packaging
15 L container Refer to current price list for packaging variations.
Colour
Note: Applied colours selected from colour charts will be approximate.
Note: For colour matching: Apply colour sample and confirm selected colour under real lighting conditions.
Light Grey and Dark Grey
Product Details
APPROVALS / STANDARDS
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BBA Certificate - 16/5294
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TÜV Rheinland Product Carbon Footprint Certificate
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Fire Testing to EN 13501-5 (Classification Brooft4) - Sikalastic®-625 BMS, Warrington Fire, Report No. 23465B, 23465D
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Olfasense - Report Number SIKA24A
Chemical Base
Elastomeric aliphatic polyurethane
Shelf Life
12 months from date of production
Storage Conditions
The product must be stored in original, unopened and undamaged packaging in dry conditions at temperatures between +5 °C and +30 °C. Always refer to packaging.
Density
~1,26 kg/l | (EN ISO 2811-1) |
Solid content by mass
~77 % (+23 °C / 50 % r.h.) | (EN ISO 3251) |
Solid content by volume
~71 % (+23 °C / 50 % r.h.) | (EN ISO 3251) |
System Structure
Note: For detailed reinforcement information refer to the Sika Method Statement: Sikalastic®-625 BMS 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 etc.
15-Year Reinforced roof waterproofing
The build-ups in the table corresponds to a reinforced waterproofing kit for flat and pitched roofs, communal walkways, podium decks and roof terraces.
Layer | Product | Consumption |
1. Primer | Depending on the substrate | Refer to the primer Product Data Sheet |
2. Base Coat | Sikalastic®-625 BMS | ~1,0 l/m2 |
3. Reinforcement | Sika® Reemat Preemium | - |
4. Top Coat | Sikalastic®-625 BMS | ~0,75 l/m2 |
20-Year Reinforced roof waterproofing
Layer | Product | Consumption | |
1. Primer | Depending on the substrate | Refer to the primer Product Data Sheet | |
2. Base Coat | Sikalastic®-625 BMS | ~1,0 l/m2 | |
3. Reinforcment |
| - | |
4. Top Coat | Sikalastic®-625 BMS | ~1,0 l/m2 |
Tensile Strength
Reinforced | ~14 N/mm2 |
Unreinforced | ~8 N/mm2 |
Tear Strength
~36 N/mm | (ISO 527-1/3) |
Service Temperature
-30 °C min. / +90 °C max.
Thermal Resistance
-20 °C min. / +80 °C max.
Chemical Resistance
Resistant to many chemicals. Contact Sika Technical Services for additional information.
External Fire Performance
Broof (T1), Broof (T4)
Dry film thickness
Waterproofing kit for all flat roof types | ~1,5 mm |
Application
Ambient Air Temperature
+5 °C min. / +40 °C max.
Relative Air Humidity
20 % min. / 85 % max.
Dew Point
Beware of condensation. The substrate and uncured applied product must be at least +3 °C above dew point to reduce the risk of condensation or blooming on the surface of the applied product. Metal surfaces will be more prone to temperature fluctuations occurring and wind chill effects.
Substrate Temperature
+5 °C min. / +60 °C max.
Substrate Moisture Content
≤ 4% parts by weight The following test methods can be used to determine the substrate moisture content:
Sika®-Tramex meter
No rising moisture must be present according to ASTM (Polyethylene sheet).
Pot Life
Note: The material in opened containers must be applied before a surface skin occurs. Note: Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity. ~1–2 hours
Applied Product Ready for Use
Important: The impact of heavy rain or rain showers can physically mark or damage the membrane in its liquid state. Note: Application at higher than recommended film thicknesses may result in a prolonged “soft” feel to the coating. This will eventually cure and harden. Note: Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.
Ambient conditions | Rain resistant | Touch dry | Full cure |
+2°C / 50 % r.h. | ~12 hours | ~20 hours | >24 hours |
+10°C / 50 % r.h. | ~9 hours | ~15 hours | ~24 hours |
+20°C / 50 % r.h. | ~6 hours | ~10 hours | ~18 hours |
+30°C / 50 % r.h. | ~4 hours | ~6 hours | ~14 hours |
EQUIPMENT
Select the most appropriate equipment required for the project: Substrate preparation equipment
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Abrasive blast cleaning / planing / scarifying or grinding equipment
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Manual or mechanical wire brushes
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High pressure power washer
For other types of preparation equipment, contact Sika Technical Services.
Mixing Equipment
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Electric single paddle mixer (300–400 rpm) with spiral paddle
For other types of preparation equipment, contact Sika Technical Services.
Application Equipment
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Brush
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Roller
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Airless spray
For more detailed information refer to the Sika Method Statement: Sikalastic®-625 BMS.
SUBSTRATE QUALITY
Important: Other substrates must be tested for their compatibility. To ensure compatibility, carry out preliminary trials. Important: Adhesion and compatibility suitability must be verified practically on site before commencing contract. Note: For consumption rates and waiting time / overcoating, refer to the individual Product Data Sheet of the appropriate primer.
Substrate | Primer |
Cementitious, concrete, brick, stone, ceramic tiles (unglazed) | Sika® Concrete Primer LO Sika® Bonding Primer |
Bituminous felt & coating | Sikalastic® Metal Primer N |
Wood | Wood based roof decks require a complete layer of Sikalastic® Carrier. For small exposed sections, use Sika® Concrete Primer LO or Sika® Bonding Primer. |
Paint coatings | Subject to adhesion and compatibility tests |
Existing Sikalastic®-625 BMS system | Sika® Reactivation Primer |
SUBSTRATE PREPARATION
The supporting structure must be of sufficient structural strength to apply all new and existing layers of the roof build-up. Complete roof system must be designed and secured against wind uplift loadings.
Refer to the Sika Method Statement: Sikalastic®-625 BMS
Suitable substrates: Cementitious, concrete, bituminous felt and coatings, brick, stone, asbestos cement, metal, wood, unglazed ceramic tiles
General All contamination such as dust, loose and friable material that could affect final finish or reduce adhesion, must be completely removed from all surfaces before application of the product or subsequent products, preferably by industrial vacuuming equipment.
MIXING
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Sikalastic®-625 BMS is supplied ready for use.
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Before application, mix for at least 2 minutes or until the liquid and all the coloured pigment have achieved a uniform colour.
APPLICATION
Strictly follow installation procedures as defined in method statements, application manuals and working instructions which must always be adjusted to the actual site conditions. Reference must be made to the Sika Method Statement: Sikalastic®-625 BMS
CLEANING OF TOOLS
Clean all tools and application equipment with Thinner C or xylene immediately after use. Hardened material can only be removed mechanically or with a proprietary paint stripper.