A pressure washer can be your greatest friend or foe.
While it can clean and refresh most surfaces (such as concrete), it can also cause damage. Thus, it’s crucial to gain enough knowledge beforehand, so you don’t accidentally do more harm than good.
In this article, we’ll discuss the process for fixing damaged concrete from a pressure washer, how to prevent future damage, and several frequently asked questions.
Let’s get started!
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Hey there, I’m Cody.
A decade of residential and commercial pressure washing led me to start JCS Refresh. Now I can share my knowledge with folks like you.
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Quick Answer
In a hurry? Here’s a quick summary of how to fix damaged concrete.
- Prepare the area
- Prepare the solution
- Wet the concrete
- Apply the solution
- Rinse the surface
- Prepare another solution (optional from step 6 to step 8)
- Apply the solution
- Rinse the surface
Quick questions before starting
Let’s answer some quick questions first before we get ahead of ourselves:
How difficult is this to do?
Depending on the extent, light damage, such as marks and streaks, are easy to remove, while severe damage can range from easy to medium.
How long does it take?
Depending on the size of the area, repairing damages usually takes 3 to 4 hours.
How much do materials cost?
The estimated cost is around $125 to $150; the materials are muriatic acid, baking soda, garden lime, ammonia, and a long masonry brush. Note that the total cost will vary depending on the product quality and availability.
How to fix damaged concrete after pressure washing
Damage from a pressure washer is more straightforward to repair than a damaged wood surface. As long as we don’t see any deep cracks, then we’re good to go.
Before starting, ensure that you are fully protected by wearing the appropriate safety clothing, such as goggles, gloves, respirator, and suitable clothing. Remember that we’ll be using a chemical that exudes strong fumes, so it’s important to gear up.
1. Prepare the area
Since we’ll be using chemicals, we suggest moving (or covering) any plants that might be harmed in the process. If this doesn’t apply to you, move to the next step.
2. Prepare the solution
Grab a bucket and mix a 1:4 ratio by diluting 1 part of muriatic acid into 4 parts of water. A gallon of the acid solution is equivalent to 45 sq. ft. of concrete marks.
3. Wet the concrete
Wet the surface with water using a garden hose. Remember that applying the acidic solution to wet surfaces is crucial.
4. Apply the solution
Spray the solution on the marks and immediately brush the area. Let the mixture sit for 10 minutes.
Never apply the acid solution to dry cement; if the surface dries during the process, you should wet it again.
5. Rinse the surface
Thoroughly wash the solution off using a garden hose. If the marks or stains are still visible, proceed to the next step.
6. Prepare another mix of solution (as needed)
In a gallon of water, dilute 1 cup of garden lime, baking soda, and ammonia and mix well.
7. Apply the solution to the marks
Carefully apply the new solution and scrub diligently. Let it sit for 10 minutes.
8. Rinse the surface
Rinse the concrete and repeat step 5 until the stains and marks are gone.
Ways to damage concrete while pressure washing
Here are a few of the most common ways people damage concrete. Keep these in mind to prevent future damage.
Using the wrong nozzle
Nozzles play a considerable role when cleaning surfaces. When pressure washing concrete, use a wide nozzle or a black nozzle.
Using too much pressure
The recommended PSI setting for concrete is between 2,500 to 3,200; anything more than that can be considered heavy-duty and must be handled by professionals.
Using the wrong cleaning detergents or solution
There is a cleaning solution/detergent for every surface; using the wrong ones might leave permanent damage, such as pure acid.
Frequently asked questions
Before we conclude, check out some related questions:
What should I spray on concrete before pressure washing?
You can spray solutions or detergents specific to concrete, and there are also eco-friendly alternatives to explore.
Will a pressure washer remove paint from concrete?
Absolutely! You can learn more about this topic in our concrete paint removal guide.
Will a pressure washer remove rust from concrete?
Of course! If you’re interested in removing rust stains from concrete using a pressure washer, we have a complete guide.
Conclusion
Pressure washing, no doubt, can wipe out dirt buildup, but without prior knowledge, you may damage the exterior and harm yourself. Decide whether pressure washing is your friend or foe.
By following the steps above, you can fix your damaged concrete in no time at all.
But if the condition is too much, it is better to leave it to local professionals.
Thanks for reading!
