How to repair a crack in a concrete swimming pool

How to Repair a Crack in a Concrete Swimming Pool

How to repair a crack in a concrete swimming pool? This is the question we are asked by pool owners that are often at their wits end, trying to find a solution to stop the continuous leaking into their pool. Pool repairs can be quite often difficult due to the fact that leaks and cracks can happen on a variety of different levels wherever there is a joint or gap between sections of your swimming pool’s shell.

Concrete Cracks Can Be Filled With Silicone

Pool owners sometimes attempt to inject silicone in concrete pool cracks. Because they know that they cannot fix the problem properly, they often turn to me for help. It won’t work. Although silicone might be an option to stop water from getting through cracks, it is not the best material for the job. It’s too lightweight, doesn’t bond well to concrete, can’t withstand hydrostatic pressure and is not strong enough to bond when there are moisture levels, a complete failure for this application. Although injecting cracks into concrete pools is not a good idea, it can be a temporary solution. However, if you want to fix the problem, you will need something that has a greater staying power than silicone. Even silicone type 2 suitable for damp applications is not strong enough to be used in this situation.

Concrete Urethane

Concrete urethane is used to fill cracks. It’s like silicone on steroids. It sucks to work with, does not clean up with water, sticks to absolutely everything, basically it is perfect for injecting into cracks in concrete pools. While a new structure is better than repairing a damaged one, it is still expensive and not something most people can afford to do. Concrete urethane is a good choice to repair a crack in a concrete swimming pool. You have a few options for this application.

Sealing Cracks in Concrete Pools

While urethane will not fix a concrete pool crack for good, it is a better long-term solution than silicone. Let’s look at this more and see what you can do to reduce or stop water from entering the crack. The process that I use is to cut a channel directly into the crack. This channel should have a minimum of one inch of concrete depth. This is done by cutting a very precise angle to create an U-shaped notch that will help in the next steps which include adding hydraulic concrete to the channel we are cutting.

You will need to cut channels on each side of the crack and run the grinder along it, creating a groove that you need to fill with urethane. Wash the channel and crack that you made with a garden hose or pressure washer before doing this. Concrete dust can prevent your urethane and hydraulic cement from properly bonding. It is possible to spray the area with water to remove the dust. However, concrete urethane should be applied to the dry area before it can be used. The crack can become dampened if it is left untreated. Therefore, compressed air is the best option to blow out any remaining dust and dry the crack. A tiger torch would also be useful to heat and dry the area before applying the urethane.

Injecting the Urethane Into the Cracks

Before injecting the urethane in the cracks, make sure you have done the necessary preparation work. This is not the best approach so make sure that the crack is completely dry before you proceed. Make sure that the urethane tube has reached a temperature of at least 165 degrees Fahrenheit before you start pressing it into the crack. Concrete urethane can be messy so make sure you have plenty of rags. Although warm urethane should be able to flow into cracks easily, it will not penetrate as deeply as you might hope. To ensure that the crack is sealed, leave a small amount of urethane on the surface. Follow the instructions on your product for the proper cure time. It may take up to a day for the urethane cure completely.

Apply Hydraulic Cement to the U-Channel

The urethane that is placed along the crack should be sufficient to prevent water from leaving the pool. It also helps to absorb any movement in concrete. However, if you are looking for a way to make sure you take every step possible, now is the time. We cut the U channel into concrete for a specific purpose. Concrete products almost always shrink after they cure. Hydraulic water-stop concrete doesn’t shrink, but actually expands slightly upon curing. Hydraulic cement can be stopped from water by using a large amount of polymers and bonding agents. The U channel shape should trap concrete from your patch. This will prevent concrete from expanding side to side. This results in a patch of hydraulic cement that is wedged in place. This creates a more water-resistant contact point than you would see with cold joints in concrete (new concrete attaching old concrete).

Although it might not be ideal, if you need to repair cracks in concrete pools, then you can expose the crack and cut a U channel. After drying, clean and dry the channel, inject warm urethane and fill the channel with hydraulic water-stopping cement. This approach has a better chance of fixing your situation than injecting silicone. Once you have a solid patch in place, allow your concrete repairs to cure for 28 days. Then, cover any cracks with a new interior layer, such as plaster, paint or paint.

Hire a Professional

A concrete pool crack can be a sign of serious problems. I strongly recommend that you seek a professional to repair a crack in a concrete swimming pool. Beach To Bay Divers and Pools offers affordable pool crack repair services that are quick and efficient. We do underwater crack repair to save you time and money in draining and refilling your pool.

Services We Offer

Piling Wrap and Re Wrap Services

Boat Detailing

Underwater Hull Cleaning

Full-Service Boat Rigging

Drain Cover Replacement

Pool Chemical Maintenance

Underwater Pool Crack Repair

To learn more about our services, contact Beach To Bay Divers and Pools today!

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