Techniques for Sealing Cracks in Concrete


While concrete is indeed a highly durable building material, it can occasionally fall subject to cracks and breakage. This is mainly due to constant temperature changes, excessive loads, and movements in the ground surface. The rigid nature of concrete makes the upper material susceptible to cracks over time.

Concrete crack repairs involve the steps that are taken to seal, join and restore concrete surfaces to their original condition. Repair techniques will vary depending on the location and size of the crack. The type of surface will also determine the specific technique that is most reliable for use.

Concrete crack repair steps

Widening of the crack

Most concrete crack repairs begin with widening the current crack in the concrete surface. With a high level of precision and skill, the existing crack is normally widened using tools such as chisels and sledgehammers. Widening is necessary because it allows for the cracked area to be patched and sealed easily, as opposed to applying sealant material into a very narrow area.

After widening, any deteriorating concrete along the edges and inside the crack should be removed. A brush or vacuum comes in handy to eliminate loose debris that can interfere with the subsequent patching process.

Preparation of the concrete patching

Concrete patching is the material that will be used to cover up the crack. There are different types of concrete patches in the market, and the type selected will depend in the actual surface of the concrete. The concrete patch is first mixed accordingly and then applied into the cracked surface.

A caulk gun can be used to apply patching to smaller cracks or delicate surfaces. Once the patching has been applied, it needs to be finished so it fits well with the rest of the concrete surface. A trowel typically comes in handy for finishing and levelling the surface after patching.


Sealing is an important step that is taken after applying the necessary patching. A sealant prevents the concrete from absorbing stains or other foreign materials that may interfere with the underlying surface. When the sealant is applied, extra material is typically added to allow the material to settle and shrink. Contractors calculate how much sealant is needed to fit a crack of a particular size.

When it comes to selecting a sealant material, the water-based products are good choices. Water-based sealants contain a polyutherane layer that provides enough insulation against damage to the concrete. In addition, any excessive sealant applied is cleaned up using citrus-based cleaners.


22 January 2018

Drainage, Reinforcement, Tamping and Other Concrete Essentials

Pouring concrete isn't necessarily as straightforward as it looks. Depending on the land, you have to make multiple adjustments ranging from laying a layer of gravel to putting in moisture barriers. Then, depending on the size of the concrete pad, you may need to add steel reinforcements. After the concrete has dried and cured, you may decide to add sealants, do an acid wash or play with other finishes. Then, of course, there are differences between pouring concrete inside or outside. In this blog, I hope to cover all those issues and more. If you're looking for tips and ideas, take a look at these posts. Whether you plan to hire a concrete contractor or do the work yourself, it can help to know this information.