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Leaking Water Storage Tank?

Leaking GRP Water Storage Tank – How to Fix?


Tank: 3x3x3 meter sectional cold water tankLeaking GRP Water Storage Tank

Problem: Leaking water around the base of the tank


Leaking GRP Water Storage Tank – First Site Assessment

Our technical team were called to visit a site where our customer reported a leaking GRP water storage tank and required assistance.
On arriving at the site, the team accessed a 3mx3mx3meter sectional cold water tank with a total holding capacity of 27,000 litres which immediately showed signs of a leak which was originating from the tank divisional wall.

Identifying the problem

It looks like piers had been set out at 1m centres but due to the tank having a 50/50 division and being 3m long it required a pier at 500mm centres which may have been an afterthought. As you can see the pier is made of block work, brick and plywood.
Totally different to the other pier walls. This may be the reason the tank is leaking as the pier is more than likely out of tolerance.
The tank base is the most important part of a tank install and if it’s not right first time problems such as this will happen. It’s got to be correct from the start”

Ryan Keltie, National Sales Manager

This tank can hold a nominal capacity of 27,000 litres which is 27 tonne plus the tank weight. Once the foundations and base of the tank are installed correctly the tank will not encounter stress points which over time inevitably cause leaks.

From the image of the water tank base, it is clear to see an issue with the tank supports. From initial installation, the supporting piers could not hold the weight of the tank thus creating stress points along the divisional wall.

Leaking GRP Water Storage Tank – What to look out for! 

  • Leaking GRP Tank on the base or any part of the construction
  • Black Mould & Blisters in the gel coat
  • Fully relined, being refilled

If you have undertaken a legionella risk assessment, or there is water around the base of the tanks or it has been identified in any other area, we have the best solution for fixing the problem. With 50 years’ experience, our technical team specialise in the manufacturing installing, and refurbishing/replacing sectional water storage tanks with minimum disruption to water supply.

We offer installation guidelines for each type of sectional tank we manufacture. Externally flanged base recommendation: Solid bearers steel supports or secondary steels. An internally flanged base, internally flanged (IF) and Totally internally flanged (TIF) tank, our recommendations include: Concrete plinths and a steel supports.

Leaking GRP Tank – Our Expert Team can help!

For professional technical advice, you can trust, check out our case studies & testimonials for water storage projects our technical teams have worked on.

If you cannot find what you require on the website please contact us directly on Office: +44 (0) 1555 664316 or email

Expert Technical Team

  • Nearly 50 Years Experience in Manufacturing, Delivery and Installations
  • Fast Delivery of Water Storage Tanks
  • Manufactured to British Standards
  • Custom Design Available
  • Supply Products throughout the UK and Worldwide

Site survey available Free of charge!

*Subject to location

Case studies
With over 50 years manufacturing and supplying water storage tanks, we ensure that all our tanks meet all relevant manufacturing standards and legislation.