Boardwalk decking · 100% black locust

Buy Boardwalk Decking | Black Locust Lumber

We supply black locust boardwalk decking for parks, beaches, wetlands, and swamps across the United States and Canada. Naturally rot-resistant, with no chemical treatment.

Scroll to walk 12 months of boardwalk

Park · install day

Golden on day one

Fresh-milled black locust is golden yellow, sometimes with a green cast. The color comes from natural extractives in the heartwood, the same compounds covered in our black locust history.

Beach · month 4

Why black locust

Rot-resistant without treatment

One of the most decay- and insect-resistant woods in North America. No copper, no CCA, nothing leaching into the sand or water below.

Hard underfoot

About 1,700 lbf on the Janka scale, harder than red oak. It stands up to foot traffic, carts, and maintenance vehicles.

Domestic hardwood

A North American species and a real-wood alternative to tropical hardwoods like ipe and to plastic composite decking.

The tradeoff

It's dense and hard to work. Pre-drill every fastener; our installation guide covers spacing and acclimation time.

Beach · month 5

Decades, not seasons

Black locust has been used for fence posts, ship pegs, and piers for centuries because it holds up where other woods rot. It's also the material the New York Botanical Garden chose for its own public boardwalk, citing the same decay resistance. Salt air, wet sand, and full sun don't change that.

50+years in ground contact,
untreated

Wetland · month 7

Built for wet ground

Wetland boardwalks sit inches above standing water and stay damp most of the year. Black locust takes that without rotting at the joints, and without chemicals leaching into a protected habitat. Independent lab testing rates black locust heartwood Durability Class 1 to 2 out of 5 against fungal decay, the same resistance level required for direct ground and freshwater contact.

Swamp · month 10

The silver gray patina

Sun breaks down the lignin at the surface and rain washes it away. What's left is a thin silver gray layer of cellulose fibers. Below it, the board is unchanged.

Swamp · month 12

Sizes

Two profiles, three lengths for boardwalk decking projects. We can discuss other sizes for each project.

5/4 × 6
6 ft8 ft10 ft
2 × 6
6 ft8 ft10 ft

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Planning a boardwalk?

Send us the length, width, and site. We'll come back with board counts, lead time, and a price. Hear from past clients about what that process looks like.

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Park Beach Wetland Swamp
00
Months in service Golden

Black Locust Lumber

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