Mastic Repair for Swimming Pools

Owning a swimming pool can be a costly thing, and there’s nothing worse than finding out your pool needs some repair. But swimming pool maintenance is essential because problems can often lead to bigger issues in and around the swimming pool area, too, like the deck and paving. So it’s vital you keep an eye on things regularly and make the necessary repairs as soon as concerns crop up. 

One such issue to keep an eye on is your swimming pool mastic, which is the joint sealant around the edges of your pool. It’s set there to ensure no water leaks from the pool into the surrounding concrete or decking. Pool mastic is needed because weather affects the ground, and its movements can cause a swimming pool to expand and contract. This can cause havoc on the paving or decking around your pool. 

If you are having problems with your pool mastic, perhaps it’s old and starting to crack. If you find your paving beginning to rise or the coping separating from your paving, it’s probably time for mastic repair.  

Let’s take a more in-depth look at pool mastic.

If your pool is set in the ground, you’ll have coping or edging around your pool, which prevents water from getting behind the pool walls when there is a lot of splashing. Pool mastic is just another name for the joint caulking around swimming pools that is applied between the pool coping and the deck or paving. When mastic repair is needed, it’s important to act quickly; otherwise, you’ll see cracks in the pool concrete or your deck could start to rot. 

Pool mastic is like putty in texture, and this is what allows it to expand and contract. So, with warm weather, your pool expands a bit, and with cold weather, it contracts slightly. The pool mastic allows for this bit of movement, all the while ensuring the concrete is sealed.

Mastic Repair for Swimming Pools

Many factors determine whether you need mastic repair for your swimming pool – from how old your swimming pool is and how often you use it to your state’s weather conditions. But it is essential to keep an eye out for signs that mastic repair is needed. 

Deck cracks

If your deck is starting to show signs of cracking, perhaps your pool mastic isn’t expanding and contracting enough. Although these cracks in your decking will start small, these small issues can turn into big problems if you don’t keep an eye on things. So make a point to do routine checks on your mastic. 

Pool Tiles

If your pool tiles are starting to fall off, you may be in need of pool mastic repair. Of course, tiles can also fall off if their glue has worn off or from extreme weather conditions. So have a look around. Is your pool warping? If so, it may be because your pool mastic is not coping well and is in need of repair.

Deck Heaving

Have you noticed your deck started to rise above the pool level? This is called deck heaving and happens because of erosion or temperature changes. Deck heaving can then damage your pool mastic


If you have noticed some separation between your deck and the pool’s coping, your mastic isn’t bonding properly. At first, the gap will be small, but it will still allow water to seep in, and over time the gap will become more prominent, causing even more water to get in. At the first sign of even the slightest gap, it’s time for mastic repair.

Why a Contractor is Best for Mastic Repair

The best thing you can do is to keep up with regular checks of your pool’s mastic situation. Examine the pool tiles and the surrounding deck and coping, and if you notice any changes, cracking, or gaps, it’s time to call the experts in mastic repair for swimming pools. Even if you’re quite handy and good with DIY, it’s not recommended you replace your pool mastic yourself. The professionals will use the right materials to ensure a new seal will last as long as possible. They will also understand the level of damage your pool faces and determine the best method to solve the problem. Having the professionals on the job will put your mind at ease.

If you would like to try mastic repair yourself, there are a few good YouTube videos and top DIY sites that can help. Make sure you have all the tools and instructions ready to make it work. 

Usually, pool mastic repair will last about five years, but this depends on weather conditions and how much you use your pool.

How We Can Help

With over 18 years of experience in the field, WaterTex Pools is your swimming pool equipment repair specialist. With our advanced knowledge of swimming pool pumps, filters, pool mastic, plumbing, electrical, saltwater systems, automation, and heaters, we are your one-stop pool & spa service provider.

If it’s time to repair your pool mastic, be sure to give us a call at 817-779-8006. WaterTex Pools is fully licensed and insured. Our technicians work on all brands and models. Our ongoing commitment to training keeps us current on upcoming changes in the industry.

For more information on how we can help your pool sparkle, go to our website.