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bellbound 01-27-2014 02:34 PM

Hairline cracks on tennis court concrete?
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We recently moved into a house and we have a tennis court, and recently I have noticed several small hairline cracks that I do not think were there previously, please see attached picture.

1. Is there a way to fill these cracks?
2. If they are not filled will these eventually grow wider?
3. The tennis court is green, please see attached image. Anyone know if this is just concrete painted green or if it is some special type of concrete?

Thanks in advance!

kok328 01-27-2014 03:57 PM

Is this an indoor tennis court?
I believe that's concrete with a special mix of green coating.
The best you could do is caulk it up to prevent water from coming in if it's an outdoor court.
This would very tedious, you will be on your hands and knees and control the application so it goes in the crack and not anywhere else.

bellbound 01-27-2014 04:39 PM

It is an outdoor court.

1. Where could I get this type of green coating for covering scratches?
2. What type of caulk should I get?
3. If water gets into the cracks, what will happen?
4. Is there anything that could be causing these cracks or is just normal? Could any type of bikes, trykes being ridden on the court cause this?


nealtw 01-28-2014 12:20 AM
The paint could be anything from latex to epoxy

bud16415 01-28-2014 05:40 AM

First and most important is what climate do you live in? Water alone can cause damage but when water freezes it expands with great force and opens the tiny cracks. Then there is a freeze thaw cycle and it keeps growing. Riding a bike on the surface did not cause this. And it is common to get cracks like this for a number of reasons.

You said you just got into the home and I’m assuming the previous owner built the court? The paint / coating looks fairly fresh and it could have been painted getting ready to sell the property. The crack could have been sealed before and will be an ongoing repair. How do you plan on using the court? I’m pretty sure there are special surface coatings for traction etc. just for these types of surfaces. The cracks are very fine right now and tight. Maybe a more elastic coating would do the job. I would call in a professional that deals with court surfaces and ask their opinion.

kok328 01-28-2014 03:37 PM

I think I need to correct myself, aren't tennis courts typically asphalt?
An unstable base and an insufficient thickness is what could be causing this issue aside from just normal settling.

nealtw 01-28-2014 04:13 PM


Originally Posted by kok328 (Post 99279)
I think I need to correct myself, aren't tennis courts typically asphalt?
An unstable base and an insufficient thickness is what could be causing this issue aside from just normal settling.

I guess Bud and I just saw this question and went with it.
some special type of concrete?

bud16415 01-29-2014 07:02 AM

Tennis courts can be grass, clay, asphalt, concrete or any other material a ball can bounce off of and a person can run on I believe. There are a lot of new surface coatings for sports surfaces that have some level of rubbery properties to them. Running tracks are becoming really shock absorbing. That was my reasoning behind at least contacting a pro for their advice or do some substantial searching on line and see what the latest is. Many people that buy homes with a court end up not using it for that reason many also have basketball hoops up. Or just a place for kids to ride bikes around. I could understand wanting to keep it up for resale value kind of like a swimming pool. I think if these are avid tennis players they would easily ask their local pro what’s a good home surface finish and does it seal small cracks. It’s a specialized field of work IMHO.

bellbound 01-29-2014 07:14 PM

I live in Southern California. It doesn’t rain here much, though some water from the sprinklers do get into these areas. The previous owners left some roller that you attach a hose to an it rolls across the court to clean it -- we used it once because it requires so much water to clean the court. I'm now glad that we haven't used it more.

We do not use the court for tennis, though we have tried it a couple of times. We use the court for our dog to run around, for roller blading, and for kids to run around, ride bikes, and we have a basketball hoop.

I have no idea if it is asphalt, concrete, etc.? I guess I need to get someone over to take a look. I’m concerned with besides resale value, just the damage that could result and make it less usable for the types of things we want to use it for.

Thanks everyone.

BridgeMan 01-29-2014 11:04 PM

A specialty firm that deals with sports event surfaces should be able to help you. If the cracks are reasonably tight (I suspect they are wider than hair-line, as a human hair is only 0.003" wide, almost invisible from 5' away), they could possibly be sealed with a low-modulus coating (meaning it remains somewhat flexible after curing) that would also provide a general surface treatment. If they are wider, possibly a low-modulus epoxy injection system could be used to fill them, followed by completely coating the entire surface.

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