Bricks Mix

Bricks Mix

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Remove Brick Mortar

Summary: Cleaning mortar off bricks is a common problem. Brick mortar can be taken off bricks using an acid. Use care when cleaning brick on your project.

How can I remove brick mortar from the sidewalk I just constructed with paver bricks? My husband and I got the mortar smeared on the brick, and it looks terrible. What methods can I use so the brick is not damaged? Is there a non-toxic way to do this repair?

Smeared mortar on brick pavers, as well as brick walls, is a very common problem. Depending upon the type of brick, the job can be simple or a nightmare. It is my hope that you do not have a deeply grooved wire-cut brick, as these have many small crevices that can make cleaning a career choice.

Since you are concerned about the toxicity of different options, you may find it very hard to do this job. You can use certain acids that are more aggressive than others, and the ones that work faster tend to be more toxic. But don’t panic as you may discover that an aggressive acid treatment may work for you if you work to control the amount of liquid used as you work.

Mortar is smeared on the brick. It is not that hard to remove if it is thin. PHOTO CREDIT: Tim Carter Typically bricklayers will use muriatic acid to dissolve mortar from most brick. This is simply a form of hydrochloric acid. When you purchase this product it often has a skull and crossbones on the label warning you that it is a powerful chemical. But these products can be neutralized. That is something all of us should have discovered in our high-school chemistry class. In fact, the mortar does neutralize the acid as it works.

There are other acids that will react and dissolve the alkaline chemicals in the mortar. Even white vinegar that is in your kitchen will work to some degree. Since you eat vinegar in many foods, you know it is not a toxic acid. The challenge for you is finding an acid somewhere between vinegar and hydrochloric acid that will efficiently remove the mortar buildup. You should consider calling a physical chemistry professor at a local college or high school. You can also visit a building supply company to see if they stock a non-toxic acid that will dissolve the mortar.

The first step in the process is to remove as much of the mortar as possible with a scraper or chisel without scratching the brick face. Clear water flowing over the brick acts as an effective lubricant that will minimize damage to the brick. If you have to tap the scraper with a hammer, do so at a low angle with the face of the scraper nearly parallel with the face of the brick. You are trying to get the mortar film to a thickness less than that of a plastic credit card.

Once the majority of the mortar is off the brick, you then should consider bathing the brick with a diluted acid solution. As mentioned before, muriatic acid is highly effective, and it works on most brick. Usually you mix one part of the acid with ten parts of clean water. Always read the instructions on the acid label and pay particular attention to all safety instructions.

It is also a good idea to contact the manufacturer of the brick. Some brick can be damaged and discolored by acids. It is really worth the effort to call the brick manufacturer if possible.

I have found in most cases you should dampen the brick with clear water before you apply the acid solution. Always try this in an out-of-the-way area if you are unsure if the acid will harm the brick. If you use muriatic acid, you should see tiny bubbles forming where the solution contacts the smeared mortar. This tells you that the acid is reacting with the mortar paste and is starting to dissolve it into the liquid solution.

Use a scrub brush to help remove the mortar. Wait five or ten minutes after the acid solution has been applied to the brick (??????) before you scrub. Allow the acid to do much of the work for you. It can take multiple applications of acid solution to remove all of the mortar. Rinse the acid solution from the brick with massive amounts of water. The more water you use, the better.

Working with acid solutions is very tricky. You can hurt yourself, your clothes, your brick, the new mortar and vegetation around your home. If you have valuable vegetation and landscaping, you should try to stop any acid solution from getting into the soil.

Be sure to wear all of the protective gear to prevent burns to your skin and eyes. Muriatic acid straight from the bottle is a wicked liquid. The fumes are very toxic, and it can cause serious burns to your skin very quickly. Do not underestimate this chemical.

I would not ever use muriatic acid on fresh mortar. Allow the mortar to cure a minimum of two weeks before you attempt to acid wash it. That said, if you get mortar on brick you should immediately try to scrape it off or brush it off. If there is a thin mortar paste that has no sand in it, that will easily and quickly be removed with mild acids like vinegar. Harsh acids will attack the fresh mortar between the brick that you do not want to remove.

About the Author

What do you call a load of “top soil” with bricks and concrete in it?

I bought a 24 yard load of “Top Soil” and what I received was black clay mixed with 1/3 brick and concrete chunks. What is this? Is this a load of construction waste or what? Yeah, I know I got ripped off but is there something I can do to get my money back or at least get what I paid for? The delivery driver swears that what he brought me was in fact top soil. (Yeah, the top of the soil at a dump site maybe.) Oh well, enough venting.

It’s probably old black top mixed with peices of curb stone in it!