Sika BlackSeal® Elastic

• BRANZ Appraised certificate No.770 [2023]
• Appraised as an Alternative Solution in terms of the New Zealand Building Code
• Complies with AS/NZS 4020, tested for use in contact with drinking water (potable water)*
• Exceeds the NZS 3604:2011 moisture vapour permeability requirements for a damp-proof membrane. Sika BlackSeal® Elastic has been appraised by BRANZ as a damp‐proof membrane behind concrete masonry basement walls, and insitu or precast concrete where the membrane is protected against damage, where drainage has been placed, and installation has been completed by a Licensed Building Practitioner trained and approved by Sika (NZ) Limited. Go to learnhow.sika.co.nz to obtain your application certificate. Refer to BRANZ Appraisal No. 770 [2023].

Shelf life is twelve (12) months when stored as stated under "Storage".

Store in original containers in a dry place below 35°C and away from frost.

1.03 kg/litre

60%

250 kN/m²

340 MN s/g

Recoat time = minimum 4 hours, or longer in cold temperatures.

Touch dry in 1 to 2 hours. Recoat time = minimum 4 hours, or longer in cold temperatures.

Minimum application rate is 1 litre per m² (in addition to the primer coat). Ideally this should be applied as two full undiluted coats at a coverage rate of approximately 2m² / litre / coat, depending on the nature of the surface being treated.

Visit our website to watch the "How to apply Sika BlackSeal Elastic" video.  (If you're a NZ LBP, do the short quiz and get your exclusive Sika BlackSeal Elastic certificate.) Sika® BlackSeal® Elastic

Clean down surface to be treated removing all dust, grease, laitance and foreign matter. Remove any form release agent residues and curing compounds by high pressure waterblasting, grit blasting or mechanical wire brushing. Grind back smooth any dags, sharp edges or ridges. Any surface irregularities should be filled using Sika MonoTop repair mortars or Sikadur‐41 epoxy repair mortar. Form a cove where required in internal corners. Stir Sika BlackSeal® Elastic thoroughly before use.

CONTROL JOINTS:
Movement control joints in concrete or concrete masonry should be sealed with Sika BlackSeal®-1 prior to applying Sika BlackSeal® Elastic.  However, for joints under pressure, Sikaflex® Tank N should be used. Please note that Sikaflex® Tank N will require an isolation tape such as a pure aluminium foil tape overlay to prevent plasticiser migration from the Sika BlackSeal® Elastic. Refer to the Sika BlackSeal®-1 or Sikaflex® Tank N datasheets for details on joint sizes and application methods. For high movement joints refer to the Sika technical department.
PRIMING: A primer coat of 1 part clean water to 1 part Sika BlackSeal® Elastic should be used. Add water slowly and mix thoroughly. Apply at  a rate of approximately 4m²/litre.