Sika BlackSeal® Elastic
Sika BlackSeal® Elastic is a water-based, flexible, bitumen emulsion containing polymers and has been formulated to prevent water vapour transmission through the wall or structure.
- B2 - Durability
- E2 - External Moisture
- F2 - Hazardous Building Materials
- Excellent moisture vapour flow resistance
- Excellent adhesion to masonry and concrete
- Water based free from solvents
- Easy to apply with brush or roller
- Easy clean up with water
- Fast cure. Can re-coat after 4 hours, weather dependant
- Can be applied to green concrete
- Easily repaired if damaged prior to back filling
- Resistant to ground salts
- Sika provides application training and registration for Licenced Building Practitioners online. Go to learnhow.sika.co.nz
Usage
Sika BlackSeal® Elastic has been formulated for use as:- Damp-proofing membrane behind retaining walls.
- Damp‐proofing membrane for underground structures.
- Masonry block walls that comply with NZS 4229 and NZS 4210
- Precast and Insitu walls, subject to specific design and comply with NZS 3101
Advantages
Complies with NZ Building code clauses:- B2 - Durability
- E2 - External Moisture
- F2 - Hazardous Building Materials
- Excellent moisture vapour flow resistance
- Excellent adhesion to masonry and concrete
- Water based free from solvents
- Easy to apply with brush or roller
- Easy clean up with water
- Fast cure. Can re-coat after 4 hours, weather dependant
- Can be applied to green concrete
- Easily repaired if damaged prior to back filling
- Resistant to ground salts
- Sika provides application training and registration for Licenced Building Practitioners online. Go to learnhow.sika.co.nz
Packaging
4 litre and 20 litre containers
Colour
Blue/Grey when wet. Black when dry.
Product Details
APPROVALS / STANDARDS
- BRANZ Appraised "Sika Blackseal Elastic Damp Proof Membrane" Appraisal No.770 [2023]
- Meets the requirements of the New Zealand Building Code (NZBC) when applied by a Licenced Building Practioner (LBP) who has completed the online training and registered with Sika NZ Ltd. Refer to the BRANZ Appraisal for full details.
- Approved by Auckland Council in 2012 for NZ Building Code compliance : B2,E2,F2.
- BRANZ tested - Mean Vapour Flow Resistance of not less than 90 MNs/g.
Shelf Life
Shelf life is twelve (12) months when stored as stated under "Storage".
Storage Conditions
Store in original containers in a dry place below 35°C and away from frost.
Density
1.03 kg/litre
Solid content by weight
60%
Tensile Adhesion Strength
250 kN/m²
Permeability to Water Vapour
340 MN s/g
Application
Waiting Time / Overcoating
Touch dry in 1-2 hours. Recoat time in 4 hours or longer depending on temperature. Must be fully dry before re-coating and backfilling..
Consumption
Consumption
- Primer Coat: 1 Part Sika Blackseal Elastic : 1 Part fresh clean potable water. Applied at 4 m2 / Litre.
- Top Coat: 2 undiluted topcoats at 2 m2 / Litre
These figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level, wastage or any other variations. Apply product to a test area to calculate the exact consumption for specific substrate conditions and proposed application equipment.
APPLICATION INSTRUCTIONS
To meet the requirements of the NZ Building Code and for compliance with the BRANZ Appraisal, Sika Blackseal Elastic must be applied by a Licenced Building Practitioner (LBP) who has been trained and registered by Sika NZ Ltd.
LBP's can go to the Sika Website for training and registration.
APPLICATION
Mix 1-part clean fresh water to 1-part Sika Blackseal Elastic. Add water slowly and mix thoroughly.
Apply the primer uniformly to the clean, dry substrate using a good quality soft bristle brush, or long nap roller. Allow to dry.
Apply two undiluted coats of Sika Blackseal Elastic. The first coat should be applied and laid off in a horizontal direction and once cured, the second coat should be applied and laid off in a vertical direction. Ensure the first coat is fully dry before proceeding with the second coat.
As soon as the membrane is fully dried cover the entire surface with a layer of Sika Blackseal Protection sheet. This can be held to the wall with dabs of Sika Blackseal-1 sealant. Allow a minimum one row overlap at each joint interface to provide continuity and stop backfill from getting behind the protection.
All drainage requirements must be undertaken in compliance with the building designer / engineer's instructions.
Commence backfilling and compacting in accordance with designer / engineers instructions and avoid damaging or moving the protection sheet during the process.
