What Causes Concrete Flaking?

Concrete flaking is an annoying but common problem that many face. Being aware of some of the causes of the flaking may help homeowners to avoid this. While some causes may be out of the average homeowners control, some others can be easily controlled by taking precautions before and after installation.

• Thawing and freezing cycles. The more thawing and freezing cycles that go on, the more likely the flaking problem is to begin.


• Deicing chemicals. Any of the chemicals, even salt that is used to melt ice, can cause flaking of concrete. Even those labeled safe for concrete have the potential to cause some issues. Even so, it is best to look for a product that says "Safe for concrete," as it is less likely to happen. You should sweep off the deicing crystals once melting has occurred. Deicing products should not be used at all on concrete that is less than a year old.


• Concrete may not have been mixed correctly. An improper mix will result in flaking and scaling. Either too much or too little water can make the concrete set up too quickly and will cause it to cure improperly.


• Time of year for pouring. The weather when the concrete was poured could have caused the problems. If it is too hot, sunny or windy, it can affect the setting time. This causes the moisture in the mix that rises to the top during setting to dry too quickly. If the weather is too cold during pouring, the concrete can freeze before it is cured which causes damage.


• There may be too much air in the mixture once it is poured. It is important to make sure the concrete is tamped properly after pouring to avoid this.


• Troweling may not have been started at the correct time. After pouring concrete, it should have a chance to partially set up before troweling. This is the most difficult part of the project, starting too early or too late can leave you with a bad finish.