Building Supplies

Power washing concrete surfaces

Power washing concrete is the most effective way to sustain the appeal and value of concrete surfaces. A pressure washer comes in handy to remove stubborn stains, such as the ones that stemmed from paint, tires, and chemicals. It also works to wash up different surfaces like driveways, sidewalks, and patios.

Therefore, The Haggarty Group prepared this article for our fantastic clientele to tell you all you need to know when power washing concrete.

First of all, you need to make sure that the power of the washer that you are going to use is at least 3000 psi and a water flow rate of 15 litres per minute. The majority of contractors agree that 3000 psi washers can handle most of the jobs, however, you may require higher pressure to remove heavy contaminants like paint and heavy tired-skid marks.

Secondly, you will need to establish an adequate water flow rate for cleaning speed. Experts suggest using a power washer with a volume output of 5 or 6 GPM; keep in mind that due to gravity, vertical surfaces do not require high flow rates. Additionally, you can use a rotary nozzle, should you wish to increase cleaning speed

Power washing yourself

  1. Prepare the area and wear PPE: This includes removing obstacles and furniture, covering electrical items, dress long pants and sturdy shoes.
  2. Apply detergent: You can also use a degreaser and/or concrete cleaner; this step is optional depending on how the surface’s state. Apply detergent and allow it to settle for 10 minutes.
  3. Wash: After the detergent has settled down, you can start power washing, we recommend using a rotary nozzle for this part of the process then switch to a fan nozzle to rinse gently surrounding areas.

Lastly bear in mind that you will require between 2-4 hours to complete this job.

To learn more about power washing best practices, and some additional tips to extend the durability of concrete in your next project; give us a call and talk to one of our specialists at 07 3281 8144, or visit to see all the products, tools, and equipment we have in store. All you need at your one-stop shop!