How to Sand Concrete Floor | Tips and Tricks on DIY

So you want to do something with the ugly concrete floors in your house. Time can slowly degrade anything include concrete surfaces. Naturally, you will look a solution to improve the floors. Applying a layer of pain or coat may solve the trouble but you can’t do it right away. You need to properly process the floor first. And you can do just that by learning how to sand concrete floor through this article.



Thick layers of dust and dirt will eventually form on your concrete floors. In order to ensure your family well-being, you must quickly deal with them. Not only they are harmful to people health, they can considerably reduce the house aesthetic value. Usually, concrete floors have layers of paint or coating on top of them. They are the concrete protective. When the protective layers are no longer around, you must process the floor surfaces before reapplying them.


Generally, the surfaces of concrete floor are very porous. This is why people coat them with paint or sealer as a preservation measure. Slowly yet steadily, the coating will deteriorate and wear off. Before you can recoat them again with protective, you need to process them which sanding is a popular method. And if you don’t know what to get or where to start, you can find all of that right below. Follow them and you will find this to be an easy job.


As the name suggests, in this method, you will need some high – quality sandpapers. Do avoid using sandpapers with coarse grits since they may scratch deeply into the concrete. You can use sandpaper on your own but it’s advised that you get an electric sander to be more efficient. Besides that, prepare a cleaning solution, a bucket and a mop. Also get a few nylon bags to assist with the disposal at the end.

There will be a lot of dust and chemical involved so protect yourself. Put on a pair of goggles, gloves and face mask or respirator when you deal the floor. For the coating, select whatever suits you. You can also get plastic sheets to protect sections of the house from dirt and dust. In case that there are doors and windows, simply shut them tight when you are in the process of sanding.

When you got everything, let’s get into it.

The process

•Step 1: Clear the space and wash the floor

Promptly remove any furniture of anything that may get in your way in the sanding space. Next, sweep the place and get rid of any debris on the surfaces. Remember to keep your gloves on at all times to prevent possible scratching. Next, mix the cleaning solution with warm water in the bucket then start mopping the floor. After a minute, re-rinse the mop with the mixture from the bucket and proceed to cleanse the floor again.

Repeat the process till you completely cleaned the floor. This will allow the later sanding process to proceed much easier. The coating will also have a better bond with the concrete if you invest time and effort in here.

•Step 2: Sanding the floor

Wait for 3 days till the humid is completely gone then take out the sandpaper. No matter if you use the electric sander or just your hands, the principle is the same. Simply sand the entire concrete floor back and forward. This will create a large amount of dust and dirt so keep your face protections on. Beside debris, you may also find the remains of the previous coating, get them out as well.


Once in while, exam your sandpaper and replace it with a new one if you saw that the paper had become smooth. Keep sanding till the concrete surfaces are ready for new coatings.

•Step 3: Clean out the residual

When you have successfully sanded the floor, it’s time to dispose of all the dirt and dust lying around. Grab a vacuum cleaner and sweep the place with it. Try to check the cleaner bag frequently so you don’t overflow its container. When you are done, take out the mop and the bucket and cleanse the entire place with the cleaning solution again. This is enough to get rid of all the debris that escaped the vacuum cleaner.

Finally, neatly wipe the concrete surfaces with a cloth and let them dry completely before proceeding to the next step.

•Step 4: Fill out the holes and cracks with primer

It’s very likely that your concrete floor would have uneven surfaces with cracks and holes by now. Before you can actually apply the coating, you need to flatten the entire place first. Therefore, it’s a good idea to start priming the floor. Take a roller and apply primer across the floor. It will cover the void and gap of the concrete while also provide a better bonding with the later coating.

Insert Image

•Step 5: Apply the coating

If you see the primer has taken its place among the concrete, now is a good time to add the coating. It’s recommended that you add 2 layers of coating and you must wait for one to dry before you add another. Use slightly overlapping horizontal strokes to spread the coating and remove the excess. When you approach corners or tight spots, you can switch to a brush to better apply the coating

•Step 6: Clamp in the masonry sealer

As usual, wait for the all the coatings to dry before applying the sealer. This will help to preserve the coating and press them tightly onto the concrete. The applying method is just like when you prime the concrete. Take the roller and apply as many layers of masonry sealer as you want. Of course, you still have to let each layer dry completely before putting on another. Your concrete should a new and improved appearance when everything is done.


And that is the end of this article, fairly easy to take in, right. Sanding concrete floor is easy, even for a first-timer. As long you can get the correct materials and proper tools, it can be done. If you dislike the look of your floor, why don’t you give it a better one? You can do that with a minimum cost if you got a firm grasp on how to sand concrete floor. The entire process is essentially a trivial task. Concentrate and stay on guard are enough to turn your ugly floor into something you can feel proud of.

Click Here to Leave a Comment Below 0 comments

Leave a Reply: