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Pool Crack Repair Information

Hairline or structural concrete cracks need proper repairing.
The Pool and Spa Informational Website or

Structural Concrete Crack Repairs, Techniques and Solutions


Scroll down to browse through some archived SWIMMING POOL questions and answers.  Please click the Pool Problems Link, on top of every page, to access a complete listing of Pool Problem subjects, an alphabetized Website Table of Contents, Pool Equipment Information, About Alan Biographic Material and a Pool Glossary. Use the other links to access additional subject information. More information about some new and unique products, for pools and spas, can be found by visiting The Website Store. You'll never know what you'll find and that's always fun. Be better prepared and avoid costly problems!


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Structural Concrete Crack Repairs
New and innovative pool products can be used to solve common problems and even some less common ones, as well.  The right product can provide a better and easier solution.  A structural, concrete crack requires more than just epoxy.  Torque-Lock Staples use 5000 pounds of torque, to hold the opposite sides together and make a rock solid repair.  Ultra Poly One Coat is a hybrid-epoxy coating, that is easier to prep and apply and can be used to refinish masonry or fiberglass pools, spas and fountains.  Boxer Adhesives' 2-part, underwater epoxy can be used to make non-structural concrete crack repairs.  Manufactured by Union Laboratories, Inc.
Structural Concrete Crack Repairs Hybrid-Epoxy Pool and Spa Coating Underwater Repair Products
Torque-Lock Staples make structural concrete crack repairs. Ultra Poly One Coat Hybrid-Epoxy Pool and Spa Coating.
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If you have a pool or spa water testing need, we should have the product.
Scroll down to read through some Question & Answer information.
Corrosive conditions can exist in a swimming pool, when the pH is maintained too low and is made worse, if the total alkalinity and calcium hardness are too low, as well.  This can adversely effect the metal parts in the pool and through which the water flows, such as ladders, rails, underwater light, heaters, pumps and filters. A ColorQ 2X is a 2nd generation, Bluetooth, Waterproof, all-digital tester, that can measure all the common test factors. There is a model, for every sanitizing need.  An Electronic PockeTester Kit, can monitor high TDS (Total Dissolved Solids), that could lead to scale formation and some types of corrosion.  Sometimes you get lucky and a strategically placed Graphic Mosaic Mat can cover a patched or repaired area and make it look all the better.
ColorQ All-Digital Water Testers PockeTester Kit for Salt and TDS Testing Premium Graphic Mosaic Pool Mats
#2086 ColorQ 2X, Bluetooth, Waterproof, 2nd generation all-digital pool and spa tester. #1749 PockeTester Kit, for salt TDS and temperature. Drop in graphic, mosaic mats, for pools.
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If you have a pool or spa water testing need, we should have the product.
Scroll down to read through some Question & Answer information.

How to make structural, concrete crack repairs in pools?

 Swimming pools can develop cracks in the concrete that lies beneath the plaster finish, due to settling, ground shifting or erosion. Simple hairline cracks in the finish may not involve a leak and can, usually, be easily repaired. However, a crack that is structural in nature and is under stress cannot be simply glued in place or plastered over, as the forces involved will continue to pull the crack apart.  Such cracks must be stabilized in order to prevent the crack from widening and causing ongoing leak problems. A product, such as Torque-Lock, prevents cracks from widening and allows for a rock-solid repair. If problems arise, refer to the Pool Problems Page, as a source of problem-solving information, broken down into various categories.  Scroll down the page and click on the linked keywords, catch phrases or images, in the archived answers below, to access additional information, on that topic or product.

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▼     Helpful, Problem-Solving Information, in a question and answer format.     ▼

Cracked And Growing In Size?

There is a crack in my pool which is in the coping about half inch wide and travels down into the tile and into the plaster about one quarter inch wide in plaster, about 7-feet long vertical down side of pool. What is the best way to repair this crack that is losing about quarter inch of water a day ? Thank you.

Elizabeth M., Simi Valley, CA, 11/11/2018

This is a structural crack, likely the result of settling. Filling the crack with epoxy might seal the leak, but the forces causing the crack will still be at work. Eventually the crack will expand.  Torque-Lock is a system for repairing structural concrete cracks. It used "staples" to hold the opposite sides of the crack together, with 5,000 pounds of torque. It is used with epoxy to make a true repair. Once complete the repaired area can be replastered.  I hope that the information provided was helpful.

Sincerely.  Alan Schuster, 11/11/2018

Cracked Pool Wall?

I have what started out as a hairline crack, in marcite, below the waterline. I used an epoxy based product to seal the crack and everything seemed OK. Now, it seems that the crack has widened very slightly. I am losing about 1/4" of water a day and, from what I have read, that is reasonably normal. Is there something that would be better to seal this crack. I'm afraid it could get bigger. Thanks for the help.

Carl R., San Diego, CA, 3/31/2020

It is hard to tell if you are losing water, at this time. If the crack widens, a leak will likely result.  If the crack is widening, it is probably an indication that the area is still under stress, due to settling, erosion, or shifting. As you have discovered repair compounds may solve the problem, but if there is ongoing stress you may need more repair efforts. The Torque-Lock Staple System will make a repair that will prevent expansion and will be rock solid. This is the right product, for your problem. I hope that this information proves helpful. Good luck with the repair.

Sincerely. Alan Schuster, 4/1/2020

Unsettling Crack?

I had my pool and deck redone about 3 summers ago. I noticed the outer decking was sinking and now one end of the pool has raised. There is a crack in the in the deck next to the skimmer basket and is just starting in the tile. The deep end of the pool and inner deck has raised 2 and 1/4 inch. What should I do?

Julie, 7/28/2016

This is a construction problem and I am really not qualified to offer much in the way of specifics. Obviously, erosion, settling or water table level changes are entering into what has happened. How it can be best remedied is something that I cannot help with. You need to discuss this with several builders and compare the options. You can't just patch a crack, as it will continue to expand. If concrete is cracked and still under stress, the Torque-Lock product might be able to help solve the issues, at hand.  Good luck with the work and I hope that I have been of some help.

Sincerely. Alan Schuster, 7/28/2016

Repairing A Pool Crack?

I have a small crack just below the tile border. If it matters the pool is in Florida. Any suggestions on what to do? I appreciate any help and thanks for the opportunity to email the question.

Dick S., Florida, 3/1/2014
Torque-Lock Concrete Crack Repair System.
There are several ways to do this, depending upon the pool surface. In the simplest case, you can use an epoxy or silicone repair material. Aesthetically, it make not be the most attractive repair. You could chip out the crack, seal with epoxy or silicone caulk and resurface the
repaired area. How inconspicuous the repaired area will be a matter of being able to get the exact match on the pool surface. However, such repairs may not last, if there is settling or stress. The Torque-Lock System physically holds the opposite side together, so that when filled with epoxy, it will not pull apart. This will make a rock-solid repair!  Good luck and I hope that this information proves useful.

Sincerely. Alan Schuster, 3/1/2014

Surface Pool Cracks?

I am planning on repainting my gunite pool next year. I have notices a few cracks and defects on the surface. I am not losing any water, above normal, so far a I know. I would like to repair the problem spots this year and paint next year. I don't want to have to drain the pool to get at theses underwater areas. Is there something that will work under the water. Thanks for the help.

Mike H., Lakeland, FL 4/23/2005
Boxer Adhesives pool and Vinyl Repair Products.

It is a good idea to do something to prevent water getting behind the original plaster finish. Boxer Adhesives manufactures a complete line of product for making underwater repairs. One of the products is an underwater epoxy kit. The material is white and can be painted over when you're ready. In the meantime it will make a water tight repair, without having to drain the water. Just follow the simple directions. Good luck and I hope that I have been helpful.

Sincerely. Alan Schuster, 4/23/2005

Cracking And Draining?

Your website is really helpful. Can you give me some information on how do pools actually develop cracks? I have heard that if you drain all the water and leave the pool empty, it can crack? Thank you for your help.

Craig. 11/16/2008

Hairline crack could develop, as the surface dries out. However, the greater danger is that the pool will crack, due to shifting or settling. In cases where the water table is high, the pool can pop up out of the ground. The shorter the time, the better, when it comes to draining and make sure the water table is not unusually high. I hope that this information will be helpful.

Sincerely. Alan Schuster, 11/16/2008

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Pool Art Graphic Mosaic Mat. Stain Reversal Kit. #2086 ColorQ 2X - 2nd Generation Pool/Spa Tester Magnetic water conditioner help solve scaling and hardness problems. #1749 PockeTester Kit
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Cracked Gunite?

We are in the process of putting in an inground gunite pool. The pool was dug and gunite was shot in 3 weeks ago. There is one area of the pool that we are noticing cracks about 4 inches long and 1/8 inch wide in the gunite that were not there 2 weeks ago. They have not yet put the plaster yet, but will do so soon. Should I insist that these cracks are repaired, or will the plaster seal them. I would rather deal with this now if it is an issue then later. Thanks.

Joan R., 5/20/2010

Torque-Lock Concrete Crack Repair System.
Cracks are subject to expansion. Just filling it in and plastering over will expose you to a cracked finish, at some future time. Insist on a proper repair or it may come back to haunt you. In my opinion, you need a product, such as Torque-Lock, to make a proper repair. It prevents expansion and allows the void to be filled in with epoxy. Once replastered, you won't know a repair was done.  I hope this information proves helpful.

Sincerely. Alan Schuster, 5/21/2010

Cracked Steps?

We have a 20X40 inground vinyl pool the steps have a crack in them . What is the best way to take care of this problem? Is there such a thing a replacement cover?

Tammy, 3/15/2006

You could try repairing the crack with an underwater epoxy from Boxer adhesives. It should be the right product. It may be possible to have a vinyl cover made for the steps. It won't be inexpensive, won't look as well and probably won't make you happy. Try the epoxy. It cures to a white finish and it should be hard to notice. Good luck.

Sincerely. Alan Schuster, 3/16/2006

Avoiding The Need To Use A Liner?

We have a very old in-ground concrete pool. The pool has now developed a crack which is leaking fast. Except for the crack the pool is in very good shape. We have been told that a pool liner is our only option (by a pool liner company). They maintain that if we fix the crack, it will only be a temporary solution since the crack will open again. I am not sure how, but this is what they say. Do you share this view or do you think we should investigate other sealing options. Any advice will be appreciated. Many thanks.

Marius G., 4/23/2005

Such a crack must be stabilized, in order for it not to happen again. In that sense, they are correct. However, Torque-Lock will allow you to stabilize the crack, so that expansion will not occur. Do it before the pool is plastered and you will have it back to new.  Good luck and I hope that I have been helpful.

Sincerely. Alan Schuster, 4/24/2005
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Free Shipping

Shipping is FREE* . . . within the Continental U.S.
A $9.99 handling charge will apply to Continental U.S. Orders, under $75.00.  Orders outside of the Continental U.S. may require some additional charge, based on quantity and destination.
Most products can be shipped World-Wide.  
International and orders outside of Continental U.S. - see comments on the ordering pages.

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