Can You Install An Under-Deck Water Tank By Yourself?

Can You Install An Under-Deck Water Tank By Yourself?

July 19, 2018 0 By Saidul Hoque

With the need to harvest and store rain water increasing around Australia, more people are installing different types of tanks around their compounds to maximise on the collection. One type of tank that is gaining popularity is the under deck water tank, thanks greatly to its design and point of installation. As the name suggests, the tank is fitted outside, beneath the deck of your house, a space that is largely unused in many households. This makes this the tank of choice for people who either have limited yard space, or are looking to add an auxiliary water tank to their harvesting system. Since they come in smaller sizes, typically between 500 and 2000 litres, some people may join two together to increase the water capacity.


Why are under-deck tanks liked by so many people?

The chief reason that people like under deck water tanks is that they occupy less space than most other tanks, and make use of space that would otherwise have gone to waste. There are however a number of reasons why these types of tanks such as;

  1. They are made from food grade plastic to the stipulations of the Australian Water Tank Standard. Then plastic is also UV treated to make sure that they last a long time without breaking down.
  2. The entire tank is enclosed to reduce chances of breeding insects such as mosquitoes which can be a pain.
  3. Under deck water tanks are a variety of sizes and shapes to allow to choose what capacity works best.
  4. You can link multiple tanks to increase the water capacity, especially if you have a larger deck.



Can you install one by yourself?

The short answer is yes. You may require some help in some of the tasks, but the entire installation process does not require any specialised machinery. It does however demand that you have some knowledge of plumbing and pipe connection, as well as a full plumbing toolkit. Here are the steps you need to follow for a successful fitting:

  1. The first step is to use an RRACC (Rainfall and Roof Area Catchment Calculator) to determine the amount of water collected. You should also take the measurements of the underside of your deck. This will help you decide what size of tank to get. Once you have done this, purchase your tank.
  2. Next, choose a suitable spot underneath your deck where you will place your tank. This should be done with a few considerations. This type of tank needs to be installed in the space between two support posts to ensure it is safe from damage. It is also important that there is sufficient clearance for you to fit a drop down pipe from the top of the tank. You should make sure the area is flat; this ensures that you get to collect the maximum amount of water.
  3. Construct a concrete base for your tank to lie on. This protects it from the damage of being in contact with the grounds for long periods, which weakens the plastic.
  4. The next step is to disconnect the downpipe from the gutter flow point where you have decided will feed the tank below.
  5. Use a 90mm pipe made of PVC and a downpipe adaptor, to run a new downpipe all the way from the inlet of your water tank. You should them connect it to the existing downpipe nozzle and use PVC to fill the joints and make them permanent. You should then flush it with a cleaner in order to dislodge and clean out any materials that may contaminate your water.
  6. Take another piece of 90mm pipe and run it from the tank overflow system into the point where the old downpipe used to connect. You may need to alter it a little bit in order to fit into the 90mm round pipe.
  7. Connect a pump to the ball valve of the tank. This will take a 25mm hose connection kit and some heavy duty plumbers tape. Depending on the tank, there will be a float chamber installed.
  8. At this point, you have done almost all the work. What remains is to run your pump to the point of use. You should out in a sedimentary filter to sieve out any unwanted material which may make some inlets to malfunction.
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