Rebuilding Your Bump with Flex-A-Clay

The bad news?

Your pitching mound surface is in dire need of repair.

The good news? Flex-A-Clay from True Pitch is here to save the day!

Flex-A-Clay is a patented, specially formulated mixture intended to repair spots of wear on your pitching mound, infield, batter’s box, or anywhere you have dirt. Our patented product offers unparalleled water draining, drying and resiliency … that also reduces sticking in the pitcher’s cleats.

In this feature, we highlight the proper ways to repair your pitching mound with True Pitch Flex-A-Clay. Follow these simple steps to get your program back on the bump!

Reminder: Mound specifications for high school through the major leagues calls for a mound that is 18 feet in diameter with the top of the pitcher’s rubber 10 inches higher than home plate. For youth leagues, consult the rule book of the governing organization.

Step One: Measure the Rubber

Take a measure to determine if the pitching rubber is 60 feet 6 inches away from the back point of home plate. Then, use the Beacon Mound Slope Gauge ( to determine if the pitching rubber is 10 inches off the ground.

Step Two: Circle Up

On a proper mound (high school play and above), the pitching rubber is 18 inches deeper than the center of the mound. To proceed mark a spot 18 inches in front of the rubber and then use a stake and a string to measure exactly 9 feet in front of that spot and mark (using chalk or similar marking tool) a circle around the mound. This will give you the proper infill dimensions.

Step Three: Dig it Out

Use a shovel to dig up at least four inches of the existing dirt material from the pitching table. Dig up an addition two inches of existing dirt around the rest of the mound.

TIP: For college mounds, we recommend digging up an additional four inches of dirt around the mound to provide a proper cap of Flex-A-Clay and ensure mound longevity.

Now that you’ve dug to the proper depth, you’re almost ready to layer in your Flex-A-Clay… before you dump any Flex-A-Clay, secure your pitching rubber so it does not move. Also, dampen the excavated area with water.

Step Four: Mix with Water

Dump the Flex-A-Clay product into a wheelbarrow and mix with at least half a gallon of water per bag. Thoroughly mix the Flex-A-Clay.

Step Five: Ready to Use

With the Flex-A-Clay now mixed with water, distribute a two-inch layer of Flex-A-Clay over the pre-dug pitching table and tamp down. Water the area as you tamp. Repeat the process, adding another two-inch layer of mixed Flex-A-Clay to the area. Tamp and water.

TIP: Cover the tamp with a trash bag to prevent the dirt from sticking.

Step Six: Get that Slope Right

To properly repair your mound back to its original glory, you must ensure the mound slope meets regulation standards. In technical terms: the slope drops 1 inch for every 1 foot down the front of the mound to the grass. The slope begins 6 inches in front of the rubber. From that point, the mound drops 1 inch per foot to the grass line. Complicated? Yeah, we know. That’s why we highly recommend using the Beacon Mound Slope gauge ( to make this job a whole lot easier.

Step Seven: Fill in the Rest

Okay, you mixed the Flex-A-Clay with water. You filled in the pitching table. You checked the sloped. Now it’s time to fill in the rest of the mound and complete this job.
Dampen the rest of the mound with water. Distribute a two-inch layer of Flex-A-Clay over the rest of the pre-dug mound. Tamp and water. This final two-inch layer should bring the pitching mound back to the proper specifications.

And now…You’re Done!

Allow the Flex-A-Clay to cure for anywhere between 24 to 72 hours. During this curing period, you’ll notice that the clay starts to crack – but don’t panic, cause it’s totally normal.

After it cures, your mound is back to the way it should be, ready for whatever flame-throwing righty or finesse lefty you’ve got on the hill that day!

To discuss further, or to make a bulk purchase, please call Brad Lamberti at 800.647.3539 or email

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