Quick answer: Mound clay and packing clay are the same product: high-clay soil packed into the landing area, around the rubber and into the batter’s and catcher’s boxes so cleats don’t dig holes. The real choices are firmness, loose bagged clay or unfired bricks, and mound clay or the softer “home plate clay” sold for the boxes. Beam Clay’s figures run from 5–10 bags to patch wear spots to 200 bags (5 tons) to build a mound from scratch. No water or nobody to repair it daily? Consider a mat.
Mound Clay vs Packing Clay: Same Thing
The industry uses the names interchangeably. Profile Products’ packing clays are Turface Professional Mound Clay and MoundMaster Blocks. Mar-Co lists its mound clays, gumbo, bricks and home plate blend under one heading: “Packing clay | Batter’s box & pitching mound.” Other terms:
- Home plate (plate) clay: medium firm and quicker drying; per Beam, “not as firm as the pitcher’s mound, yet firmer than base paths.”
- Bricks or blocks: moistened, compressed clay, unfired (“green” bricks, per Beam), not kiln-baked.
- Gumbo: a very high-clay grade, usually grey, blue or black. Indianapolis Indians groundskeeper Joey Stevenson says his is more than 95% clay.
First: Should You Use Clay at All?
Beacon Athletics’ ballfields.com blog asks two questions. Do you have water at the field? Clay must stay moist; dried out, it gets very hard and can crack or chip, which can be dangerous. Who will maintain it? Beacon calls clay “a high-maintenance product”; Profile says a mound needs a few minutes of repair every day.
If a couple of parent-coaches are the whole grounds crew, Beacon suggests a rubber or artificial mat. Beam also sells permanent poured polyurethane pads set 2″ below the surface, which it says cut maintenance in those areas by 95%.
Choice 1: How Firm (How Much Clay)
The MLB groundskeeper blog puts a typical harder mound mix at about 40% sand, 40–50% clay and 10–20% silt, versus about 60% sand, 30% clay and 10% silt for infield mix. Beam sorts major products by firmness:
- Extra firm: Beam’s red, orange or brown; Pro’s Choice Pro Mound (dark grey “blue gumbo”); Diamond Pro Professional Mound Clay.
- Medium firm: Beam’s grey “blue gumbo” or tan; Diamond Pro Mound/Home Plate Clay; Mar Mound; Hilltopper, polymer-enhanced to compact without added water, recommended for artificial turf infields.
DuraEdge grades by clay content (per ballfields.com): DuraPitch Premium, about mid-30% clay, for recreational and some high school fields; DuraPitch Professional (about 55–65%) and BlackStick black gumbo for college, pro, or crews with the manpower to manage them.
With rubber or plastic cleats, Beacon says stick with lower clay: blunt cleats act like small tamps and can make very-high-clay areas hard and slippery. Gumbo cracks and chips unless covered, so Stevenson reserves it for fields with a mound tarp and water. Beam: the best clay “depends on your location and the consistency you prefer,” and good local clay may work too.
Choice 2: Bagged Loose Clay or Bricks
For bricks: Beam says they’re cleaner and easier than loose clay and replaceable when worn. Beacon’s ProBricks don’t spoil if they dry out; you rehydrate them.
Against bricks: “You are paying to ship water,” says Beam. About 14 mound bricks equal one 50 lb bag of mound clay compacted. Bricks are separate pieces only 2-3/8″ thick; loose clay installed properly 4–6″ deep becomes one solid piece.
Loose clay arrives dry (Beam’s is pulverized and screened; you add water), premoistened (DuraEdge) or almost muddy (MLB blog). A vendor gets you consistent material, and Minnesota Twins groundskeeper Larry DiVito notes bagged clay means less waste and easier storage than bulk. Profile’s budget middle path: a couple of bags of clay plus blocks only in the worst-wear spots.
Choice 3: Mound Clay or Home Plate Clay
Beam sells home plate clay for plate areas (and mounds) that aren’t covered. Dig batter’s boxes 4–6″ (Profile says 4″), add a bonding layer, then fill with premoistened home plate clay. Or blend mound clay into existing boxes, or use straight mound clay for very firm boxes kept covered. Drag 1/4–1/2″ of infield mix over the top for a softer, quicker-drying surface. In softball, Beam says infield mix is normal for the circle and boxes, with home plate clay for a firmer base.
Which Material Goes Where
| Material | What it is | Where it goes | Who it suits |
|---|---|---|---|
| Extra-firm mound clay | High-clay soil, bagged dry or premoistened | Landing area, table around the rubber | Covered mounds with water on site |
| Gumbo | Very high-clay packing clay | Landing area, around the rubber | Crews with a tarp, water and daily repair |
| Home plate clay | Medium firm, quicker drying | Batter’s and catcher’s boxes | Boxes that aren’t always covered; firmer softball areas |
| Unfired bricks/blocks | Premoistened compressed clay | Table, front of rubber, landing area, boxes | Crews wanting cleaner installs, replaceable pieces |
| Infield mix | Sandier, well-draining soil | Mound base, sides and back | Two-material mounds (MLB blog, DiVito), but never the wear areas |
How Much Mound Clay Do I Need?
Beam’s bags are 50 lb (40 per ton); Mar-Co’s are 40 lb, with 2,000 or 3,000 lb super sacks.
| Job | Loose clay | Source |
|---|---|---|
| Build a regulation mound entirely of clay | 5 tons (200 bags) | Beam |
| Firm local base, wear areas topped with at least 6″ of clay | 2 tons (80 bags) or less | Beam |
| New mound or total rebuild, two-material method | 8–10 tons: 2 tons harder clay, 6–8 tons infield mix | MLB blog |
| Patch wear spots, 6″ deep | 5–10 bags | Beam |
| Little League mound | 13 bags per inch of depth | Beam |
| Batter’s box | About 4 bags per inch, per box (16–24 bags at 4–6″) | Beam |
| Catcher’s box | About 3 bags per inch (12–18 bags at 4–6″) | Beam |
| Softball circle, 10′ diameter, 6″ deep | About 80 bags (2 tons) | Beam |
| Area | Bricks or blocks (2.5″ deep / 4″ deep) | Source |
|---|---|---|
| Youth 8″ mound | 158 / 252 | Beacon |
| Adult 10″ mound | 243 / 389 | Beacon |
| Softball mound | 122 / 195 | Beacon |
| Batter’s box: youth 6’x3′; adult 6’x4′; softball 7’x3′ | 81; 108 / 173; 95 / 151 | Beacon |
| Catcher’s box: youth; adult; softball | 81; 108 / 173; 113 / 180 | Beacon |
| Budget plan: front of rubber, 24″ wide | 6 blocks set on edge | Profile |
| Budget plan: landing area, 24″ x 32″ | 24 blocks | Profile |
| Budget plan: back-foot spot, 24″ x 16″, each batter’s box | 16 blocks per box | Profile |
Beacon says the 4″ depth isn’t needed at youth levels where metal spikes aren’t allowed. MoundMaster Blocks come 8 to a bag, so Profile’s plan (62 blocks) is just under 8 bags.
Installing Clay and Bricks
For full construction, see how to build a pitching mound. For wear areas and boxes:
- Dig out the front slope 4–6″ and boxes 4″ (Profile); for a sandy mound’s first reconditioning, Beam removes 6″.
- Bond: mix 1/2″ of dry new clay into the top 1″ of old material, wet and compact so layers don’t crack apart (Beam). No conditioner between layers; it keeps them from bonding (MLB blog).
- Lifts: 1 inch at a time per Profile, the MLB blog and the Brewers’ Michael Boettcher; never more than 2 inches per Beam and DiVito.
- Moisture: compacted clay should let you just barely push a thumbnail 1/4″ in (Beam), or be just a bit drier than Play-Doh (MLB blog). Sticking to the tamper means too wet; tamp in dry clay.
- Tamp: “Use a heavy hand tamper and slam it down!” (Beam).
Beam wants the top 6″ of wear areas in straight mound clay; DiVito calls a solid 4″ adequate if tarped and maintained. For bricks, Beacon digs 1/2″ deeper than the brick, tamps the subgrade to the finished slope, lays bricks tight with alternating seams, soaks and caps them with 1/2″ of infield soil or topdressing.
Daily Repair Routine
- Pull back topdressing and sweep holes to bare clay. If topdressing stays on old clay, new clay “will not bind and will tear out” (Profile).
- Loosen worn areas with a sharpened iron rake.
- Wet the hole until tacky, add clay or shredded softened blocks, and tamp.
- Shave high spots, retamp and rehydrate the clay area.
- Re-cover with topdressing, water and tarp.
Tarp the mound every day, rain or sun (DiVito); see our tarps guide. Check the slope with a slope gauge several times a season (Beacon).
Keep Infield Mix Out of the Wear Areas, and Topdressing Out of the Clay
“Don’t use the same material on your infield and mound,” Beam says: well-draining infield mix isn’t firm enough where pitchers plant. That doesn’t mean an all-clay mound: the MLB blog builds the sides and back from infield mix, and pro groundskeepers put hard clay only on the table and front slope.
Calcined clay and topdressing go on top only (Beam: about 1/4″; MLB blog: 1/8″ of conditioner). Never mix them into mound clay; they weaken it and it digs out faster. More in calcined clay vs infield mix.
Gear for this job
- Packing clay — Builds up the mound body and tabletop, and patches the mound between innings.
- Plate clay — Builds and patches the batter’s boxes and the catcher’s box.
- Clay bricks — Set into the pitcher’s landing area and the back-foot spot of each batter’s box to protect the spots that take the most wear.
- Hand tamp — Packs down each layer of packing clay before the next one goes on.
- Mound tarp — Covers the mound whenever it isn’t in use, every day in season and through the offseason.
Buying more than the basics? See our full field maintenance products list. As an Amazon Associate, InfieldFinder earns from qualifying purchases.
Pitching Mound Clay for Sale: Where to Buy and Who Can Help
Most mound clay moves through regional distributors. Start with our Mound & Plate Clay directory or search mound clay suppliers; for base and side material, search infield dirt suppliers. Confirm stock and delivery directly.
National mound clay brands
- Beam Clay (Partac Peat), Great Meadows, NJ: blends for mounds and boxes, bulk or bagged, coast to coast.
- Turface Athletics (Profile Products), Buffalo Grove, IL: mound clays and conditioners through authorized dealers.
- DuraEdge Products, Grove City, PA: engineered mound clays and infield mixes, shipped nationwide.
- Mar-Co Clay Products, Bright, ON: mound clay, home plate clay and red or gray packing clay bricks, shipped to U.S. distributors.
- Diamond Pro (TXI / Arcosa), Dallas, TX: mound and home plate clays.
- Pro’s Choice Sports Field Products, Chicago, IL: Pro Mound for mounds and batter’s boxes.
- Southern Athletic Fields, Columbia, TN: Mar Mound, a high-density red packing clay.
- Stabilizer Solutions, Phoenix, AZ: Hilltopper Waterless Mound Clay.
Regional suppliers and distributors
Northeast:
- Batavia Turf, Elba, NY: New York’s exclusive DuraEdge distributor, with ready-to-apply DuraPitch mound clay.
- New England Specialty Soils, Leominster, MA: mound clay in bagged and brick form.
Midwest:
- Phoenix Stone Company, Mount Clemens, MI: moisturized mound clay, compressed field bricks and Home Base Blend.
- Buckeye Trade & Supply, Columbus, OH: moisturized mound clay, batter’s-box packing clay and RediBrick field bricks.
- Chris Shane Company, Dayton, OH: Mar-Co mound clay and batter’s box bricks for Ohio, Indiana and Kentucky.
South:
- River Sand Inc., Alpharetta, GA: red mound clay, loose rather than brick, metro Atlanta.
- C.C. Calhoun, Winter Haven, FL: bulk mound clay from its own Georgia mines.
- TMC Sports Turf, San Marcos, TX: mound clay and mound tarps across most of Texas.
West:
- Arbor Rock, Broomfield, CO: Pitcher’s PRO mound clay in super bags for the Front Range.
- Valley Athletics, Portland, OR: mound clays from warehouses across the West.
Contractors who build and rebuild mounds
- Van’s Enterprises, Waukegan, IL: mound construction with loose-fill clay or clay bricks.
- BallField Renovations, Greenfield, IN: mound and batter’s box construction using clay pavers.
- Sports Field Services LLC, Hawthorne, NJ: mound and plate rebuilds, plus workshops for volunteer crews.
Want the whole job done? See the field builders and renovators in our directory, or browse all baseball field vendors.
