Specification for Repairing Concrete & Masonry Block Water Tanks  Leaking Water

Rigid  Water Tanks Sealed Externally

External Waterproofing Method | Internal Waterproofing Method

Products required

Method Repair for External Cracks of Concrete Tanks Leaking Water

Note:- Tank should be structurally sound and leaking cracks not flexing

1. Remove all render, paint or other material from the substrate. Pressure clean to remove any growth on the surface.

2. Any cracks or voids (wider than 1mm) should be ground open (avoid chiselling, impacts may cause other areas to leak) other at least 3.5mm wide and 20mm deep with dovetail or square shoulders (see diagram below) and repaired with either MAXREST or MAXPLUG if there is flowing water. Go to our video here & give us the thumbs up! DRIZORO MAXJOINT ELASTIC may also be used

maxplug-squarecut-reverse-cork stop leaking tank

4. Apply the first coat of DRIZORO MAXSEAL FOUNDATION  or MAXSEAL FLEX approximately 150 mm – 200 mm on each side of the crack. For a neat finish use masking tape along the edges.

5. Leave to cure overnight (recommended 14 hours minimum between coats)

6.  Any cracks still leaking, seal with Drizoro MAXPLUG, then apply the second coat of  MAXSEAL FLEX.  High humidity will affect the curing of Drizoro products.
Recommended that the tank be well ventilated to prevent longer curing.

7. Whether coating just the crack or the entire external surface of the tank recommended usage should be approximately 2.5 Kg of product per square meter. If this coverage has not been achieved a third coat may be required.( 1.25 mm per coat)

Commonly Used Products In Tank Repairs

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