How to fix leaking concrete water tank

lukethomas

Sikaflex-11FC used to seal a overflow pipe

Sikaflex 11FC is a great product for repairing cracks and leaks in concrete water tanks particularly for DIY, its a polyurethane sealer-adhesive rated for use underwater and is suitable for drinking water. 

• Must be applied on the inside of the tank! 
• Tank must be clean and dry! use pressure washer 
• For best results use a 5 inch Dimond cutting blade to open up the crack in concrete to around 5mm wide and 10mm deep reason being is that this product is 35% felxible but if the crack is only 1mm wide that is not going to allow much movment!

Materials

https://www.bunnings.com.au/sika-300ml-concrete-grey-sikaflex-11fc-purform_p0628962 

Tools

JacobZ

Hi @lukethomas,

Welcome to the Bunnings Workshop community, it is fantastic to have you with us.

Sikaflex 11FC Purform has a wide variety of uses and this just adds to the list.

Thank you for sharing your experience using this product.

Jacob