The Retaining Wall Block Circle Kit for Rivertown & Carlton Pavers
If you’ve got Pavestone Rivertown or Oldcastle Carlton retaining wall blocks — the two most common straight-edge blocks sold at Home Depot — you don’t need a separate, proprietary curved block to build a circle. PaverTrax is a paver track system that locks the straight blocks you already have into a perfect ring.
Built for these two exact bricks — not a substitute, not “something close”:
- Pavestone Rivertown Concrete Retaining Wall Block, 3″ x 6″ x 10″, Model #80749
- Oldcastle Carlton Concrete Retaining Wall Block, 3″ x 5.88″ x 10″, Model #16204427
No cutting. No ordering a second, curved-only product line just to turn a corner into a circle — but only these two dimensions lock into the PaverTrax track, which is exactly why this whole page exists: it’s the direct answer for someone standing at the Home Depot shelf (or already holding a receipt for one of these two) asking “now what.”
Building a Fire Pit Ring With Retaining Wall Blocks
A fire pit is just a circle — and the same rectangular retaining wall blocks you’d use for a straight garden wall work perfectly with a track system. PaverTrax gives you a clean, evenly-spaced ring every time, sized to your fire pit insert, without hand-fitting angled cuts around the curve.
Building a Tree Ring or Garden Edge
The same track system works around a tree, a garden bed, a mailbox post, or any focal point — pick your diameter, lock in your blocks, done. See our full Pavers Around a Tree guide for tree-specific tips.
How It Works
- Pick your diameter. Five sizes, from 12 to 16 pavers on the base ring — see the table below.
- Assemble the track. Snap the sections together to your chosen size.
- Lock in your Rivertown or Carlton blocks — line them up with the track and snap in the pin.
- Stack a second layer for a taller fire pit wall or retaining edge.
- Finish it — fire pit insert and gravel inside for a fire ring, or mulch/soil for a tree ring or garden bed.
| Pavers | External Diameter |
|---|---|
| 12 | 3’5″ |
| 13 | 3’8″ |
| 14 | 3’11” |
| 15 | 4’2″ |
| 16 | 4’5″ |
Frequently Asked Questions
Can I use retaining wall blocks for a fire pit?
Yes — standard rectangular retaining wall blocks like Pavestone Rivertown or Oldcastle Carlton work well for a fire pit ring when assembled with a track system like PaverTrax, which handles the circular spacing for you. No curved blocks required.
How many retaining wall blocks do I need for a fire pit ring?
Typically 12 to 16 blocks per layer depending on your desired diameter (3’5″ to 4’5″), plus extra for additional layers of height.
Do I need special curved blocks to build a circle with retaining wall blocks?
No. That’s the proprietary-kit model (special curved stones, single supplier, marked-up pricing). PaverTrax’s track system is designed specifically so standard straight retaining wall blocks — like Rivertown or Carlton — snap into a circle without any special-shaped pieces.
Can I use Pavestone Rivertown blocks with PaverTrax?
Yes — Rivertown’s 3″ x 6″ x 10″ dimensions are one of the two paver sizes PaverTrax is built around. Buy Rivertown blocks on Home Depot →
Can I use Oldcastle Carlton blocks with PaverTrax?
Yes — Carlton’s 3″ x 5.88″ x 10″ dimensions are the second paver size PaverTrax is built around. Buy Carlton blocks on Home Depot →
Do I need to buy the bricks and the track separately?
Yes — the retaining wall blocks come from Home Depot (linked throughout this page), and the PaverTrax track system is a separate purchase from us. Neither one works alone for this project.