Product Data Sheet Safety Data Sheet Show all documents

Sikalastic®-625 BMS

Low odour polyurethane liquid-applied waterproofing with verified 35% lower product carbon footprint (vs. Sikalastic®-625N, TÜV Rheinland PCF)

Sikalastic®-625 BMS is a 1-part, polyurethane, reinforced, cold-applied liquid membrane. It is formulated using Sika’s i-Cure technology and includes a proportion of biomass-balanced raw materials and bio-based solvents. The product has been independently verified by TÜV Rheinland to deliver a 35% reduction in product carbon footprint compared to Sikalastic®-625N (cradle-to-gate assessment).

  • 1-part, ready-to-use formulation
  • Cold-applied – no heat or flame required
  • Can be applied by brush, roller, or spray
  • Suitable for light foot traffic areas (e.g., maintenance walkways)
  • Vapour permeable
  • UV-resistant and color-stable (refer to test data)
  • Remains flexible at low temperatures
  • Moisture-triggered curing for early rain resistance
  • Formulated with bio-based solvents and biomass-balanced raw materials
  • Low-odour formulation
  • Elastic properties supported by technical data
Contact Us
Product Data Sheet Safety Data Sheet Show all documents

Usage

Suitable for the following waterproofing applications:
  • Roof waterproofing in new construction and refurbishment projects
  • Reinforced waterproofing of flat and pitched roof structures
  • Application on roofs with complex detailing, including penetrations, drains, and roof lights
  • Use on existing substrates such as concrete, bituminous felt, coatings, brick, stone, asbestos cement, metal, wood, and unglazed ceramic tiles
  • For exterior use only
  • Sikalastic®-625 BMS must be applied by trained professionals in accordance with Sika’s technical guidance.
 

Advantages

  • 1-part, ready-to-use formulation
  • Cold-applied – no heat or flame required
  • Can be applied by brush, roller, or spray
  • Suitable for light foot traffic areas (e.g., maintenance walkways)
  • Vapour permeable
  • UV-resistant and color-stable (refer to test data)
  • Remains flexible at low temperatures
  • Moisture-triggered curing for early rain resistance
  • Formulated with bio-based solvents and biomass-balanced raw materials
  • Low-odour formulation
  • Elastic properties supported by technical data

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

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

  • British Board of Agrement (BBA) certified (No. 16/5294)
  • European Technical Assessment (No. ETA - 24/0748)
  • CE marking and declaration of performance based on European Assessment document ETA-24/0748. (EAD) no. EAD 030350-00-0402 for Liquid applied roof waterproofing kits.
  • TÜV Rheinland Product Carbon Footprint Certificate
  • Classification BROOF(t4) to BS EN 13501-5 on defined permutations of system build up
  • Olfasense (No. SIKA24B_02 & SIKA24B_02_625)
  • Declaration of Performance No. 36534930
Product Information

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 information

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 roofs.

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

Sika® Reemat Preemium

-
4. Top CoatSikalastic®-625 BMS~1,0 l/m2
Technical Information

Tensile Strength

Reinforced 

~14 N/mm2

Unreinforced 

~8 N/mm2

Tear Strength

~36 N/mm 

(ISO 527-1/3)

External Fire Performance

Broof (T1), Broof (T4)

Chemical Resistance

Resistant to many chemicals. Contact Sika Technical Services for additional information.

Thermal Resistance

-20 °C min. / +80 °C max.

Service Temperature

-30 °C min. / +90 °C max.

Dry film thickness

Waterproofing kit for all flat roof types

~1,5 mm

Application

Application Information

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

Waiting Time / Overcoating

~48 hours.  For longer periods ≤ 7 days, the surface must be reactivated with Sika Reactivation Primer.

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
Application steps

EQUIPMENT

Select the most appropriate equipment required for the project: Substrate preparation equipment

  • Abrasive blast cleaning / planing / scarifying or grinding equipment

  • Manual or mechanical wire brushes

  • High pressure power washer

For other types of preparation equipment, contact Sika Technical Services.

Mixing Equipment

  • Electric single paddle mixer (300–400 rpm) with spiral paddle

For other types of preparation equipment, contact Sika Technical Services.

 

Application Equipment

  • Brush

  • Roller

  • 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

  • Sikalastic®-625 BMS is supplied ready for use.

  • 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.

Documents