Penny Flooring: Pros, Cons, and Buying Guide

Somewhere between folk art and viral Pinterest project, copper coins have been finding their way onto bathroom and bar floors for the better part of 15 years. Penny flooring gets more compliments than any other finish I have installed, but it is also the most labor-intensive weekend project a homeowner can sign up for. You are looking at 250 to 300 coins per square foot, 40 to 80 hours of hands-and-knees placement, and an epoxy pour that does not forgive mistakes. For the right room, the result is extraordinary — a mosaic of amber, copper, and patina that catches light in a way no stone or tile can match. Here is the full playbook.

How Many Pennies You Actually Need

A US penny measures 0.75 inches in diameter and covers roughly 0.44 square inches. Once you account for the gaps between coins, plan on 284 pennies per square foot for a hexagonal close-pack pattern and around 320 per square foot for grid layouts. A small 40-square-foot powder room needs 11,400 to 12,800 coins — about $128.

Buy bulk from the bank in $25 rolls (2,500 pennies). Some banks will order bricks of pennies if you ask ahead. Coin dealers and Craigslist sellers offer sorted pre-1982 copper pennies (95 percent copper) for premium projects, but mixed modern pennies (post-1982 copper-clad zinc) produce the same visual effect once sealed.

Color Sorting and Patina Options

Part of the craft is sorting coins by color. Bright, newly minted pennies give a uniform rose-gold look. Aged pennies introduce browns, reds, and near-blacks for depth. Most installers sort into three to five color tiers and distribute evenly to prevent dark clusters.

Patina shortcuts speed the process. Soak a batch of pennies in ammonia and salt for 6 to 12 hours to force green verdigris. Bake cleaned pennies in a 350°F oven for 20 minutes to darken them uniformly. Leave others untreated for contrast.

Layout Patterns

• Hexagonal close-pack — Most common. Coins nest tightly with minimal grout lines. Looks organic and uniform
• Grid — Pennies aligned in rows and columns. Modern feel but shows imperfections easily
• Herringbone or chevron — Pennies arranged in directional rows. Advanced layout, 25 percent longer install time
• Mosaic medallion — Pennies used as accent inside a larger tile field. Great for entry halls

Subfloor and Prep

Penny flooring needs a rigid, level base. Over wood subfloors, install 1/4-inch cement backer board (Durock or HardieBacker) screwed every 6 inches. Over concrete, clean the slab with trisodium phosphate, grind any high spots, and fill low spots with self-leveling underlayment to 1/8 inch in 10 feet.

Prime the substrate with a two-part epoxy primer like Rust-Oleum Concrete Saver 9100 or a latex bonding agent on backer board. This step prevents the adhesive from drawing down into the substrate and leaving dull spots under your coins.

Adhesive Choices

Two methods dominate. The first glues pennies individually with a PVA (Elmer’s or Titebond), then pours epoxy as a protective topcoat. The second embeds pennies directly into a thin bed of thick-pour epoxy. Direct embedding gives a more seamless look but offers zero do-overs — a coin placed wrong cures in place in 20 minutes.

Pennies glued in advance let you sheet the pattern on mesh backing (like tile mesh) and place larger sections at once. This is the method most DIYers use and the one I recommend for first-time installers.

The Epoxy Pour

You need a self-leveling, UV-resistant, high-build epoxy — not hardware store floor paint. Stone Coat Countertops Epoxy, Total Boat TableTop Epoxy, and Pro Marine Supplies Table Top Epoxy all work. Budget $200 to $350 per gallon and plan on one gallon per 20 square feet at 1/8-inch build.

Mix in 1:1 ratio by volume, pour within the pot life window (typically 40 minutes at 70°F), and spread with a notched trowel. Torch the surface with a propane or butane flame to pop air bubbles. Keep the room above 70°F and below 50 percent humidity during the 72-hour cure.

Some installers pour in two stages: a first flood coat that wicks between coins to eliminate voids, then a second coat to bury the pennies under 1/16 inch of clear epoxy above the coin surface.

Pros

• Unique, conversation-starting finish that costs roughly $3 to $6 per square foot in materials
• Tougher than ceramic tile once cured — epoxy resists water, stains, and impact
• Warm copper tones play well with brass fixtures, black cabinets, and exposed brick
• Fun multi-weekend DIY that family members can help sort and lay

Cons

• Labor is brutal — expect 1 to 2 hours per square foot for placement alone
• Epoxy yellows over 5 to 10 years with UV exposure. Use UV-stable epoxy and window treatments
• Repairs are difficult. A chipped epoxy section requires full re-pour of that zone
• Slippery when wet. Add anti-slip additive to the final epoxy coat for bathrooms
• Not legal to deface US currency commercially, though residential decorative use is not prosecuted

Cost Breakdown for a 40-Square-Foot Bathroom

• 12,000 pennies: $120
• Backer board and screws: $60
• Primer: $40
• PVA glue: $30
• Self-leveling epoxy (3 gallons): $600 to $1,000
• Tools (trowel, torch, mixing supplies): $80
• Total: $930 to $1,330, or $23 to $33 per square foot

Is It Worth the Work

For a powder room, bar floor, entry vestibule, or small accent zone, the payoff justifies the weekends. For a full kitchen or living room, the scale becomes punishing and the cost per square foot exceeds high-end tile. Treat it as a statement surface in a 20 to 60 square foot space and you will have the most photographed floor in the house.