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4 Steps to Installing Your Rooftop Water Tank

4-steps-to-installing-your-rooftop-water-tank

Many businesses prefer to have water immediately available to their building. This water can then be used for washing, plumbing, and fire suppression if necessary. Even if you use city water, a rooftop water tank is a great way to harvest water and save you money on your utility bills. Installing a rooftop water tank is not difficult if you follow these four steps.

Build a Base

Your building should have a flat, level surface for the roof that your water tank can sit on. Where the tank is going to be placed should have a base or foundation. The base should be about two feet wider than the tank. If your roof is pitched, you need to find a location where you can build out a foundation that will be sturdy enough to hold the weight of the tank when it is filled with water.


The tank has to be on the roof to allow for the forces of gravity to pull water where it needs to go, whether that be up or down the pipes. Since the tank is installed on the roof, the potential energy that gets stored allows for the tank not to need to rely on electric motors or any external forces. You can use an automatic girth welder to secure the tank to the roof.

Check the Size

Depending on your business and how large of a building you’re working with, you need to make sure you order the correct size water tank. Too small and you won’t have enough water, too big and you could end up with too much water, which ends up hitting you right in the wallet.

Install Overflow Drainage

Some tanks come with an overflow spout installed while others may require you to install one yourself. Simply drill a hole, attach the gasket and filter, then drill screws in place to secure the overflow. This way, excess water has a place to escape and does not erode your foundation due to water dripping from the tank.

Install Air Vents

Even with the power of gravity, your tank will likely utilize pumps and a pressure system to get water where it needs to go. If that’s the case, it’s best that you make sure air vents are properly installed. Air vents ensure that your tank won’t be damaged should something go wrong with the pressure systems of your tank. Failing to do so could have the pumps trying to suck everything from the tank, causing a vacuum effect that crumples the metal of your tank.


A rooftop water tank is a great way to ensure your building has water. If you’re thinking about installing a water tank, it’s important to think about everything that entails, from the installation to the extras that come with it. You should be sure to install a base where the tank can sit, giving extra consideration to where that will be if your roof isn’t a typical flat surface like most commercial buildings. You should also make sure you order the correct size of the tank, not too big or too small so that your building gets the water it needs, but you’re not paying for extra. Overflow drainage is a good safety feature for your tank as it ensures water damage won’t be something you have to worry all that much about. Finally, you also need to protect the integrity of the tank by getting vents installed so that a vacuum isn’t created by the force of the pressure system.


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