How to fix water ingress

[mpc]

Hello All,

Need some expert advice on how to fix water ingress problem. I have a big water tank on to the side of the house and next to it a shed with roof inclined towards the tank. As shown.

When it rains the water is seeping in and created gap between the external wall and the concrete slab. 

I was thinking of removing the tank, fill the gap created. Removing tank is a bit labor intensive I believe. 
Any other ideas please.

[JacobZ]

Hi @mpc,

A warm welcome to the Bunnings Workshop community and thank you for your question.

You're going to have to move the water tank to fix the issue, unfortunately, there's no avoiding that.

It's difficult to say the best method of filling the gap as we don't have a great view of it, but Sikaflex 11FC Purform to fill the gap and direct water away from the wall is a likely solution.

You should also consider moving or replacing the shed with one that directs water away from the house. At present it is discharging water towards the house which is certainly not ideal considering the water ingress issues you are having.

Let me know what you think.

Jacob