Willem Warmbold
Choosing the best wood for decks? Compare lifespan, cost, and upkeep across six materials, then get a quote from Black Locust Lumber.
The best wood for decks comes down to three questions: how long you need it to last, how much upkeep you’ll actually do, and where the wood comes from. Ipe wins on raw hardness. Pressure-treated pine wins on upfront price. And black locust is the one North American species that lasts for decades with no chemical treatment at all — which is why we built a business around it.
We're Black Locust Lumber, a second-generation family sawmill in Port Royal, Pennsylvania. For more than 25 years, we've worked with a single species, milling decking, siding, pavers, and boardwalks for projects across the U.S. and Canada. We're not neutral about black locust. But we handle every one of these materials on job sites, and this guide gives you the honest version of each.
Western red cedar and redwood are the classic mid-range choices, and for good reason. Both are naturally decay-resistant, both are light and easy to cut, and both look beautiful the day they go down.
The limits show up later. Cedar's Janka hardness sits around 350 lbf, so it dents under a dragged chair or a dropped tool. Sapwood in either species has little decay resistance, so grade matters enormously — "all-heart" redwood performs very differently from a mixed-grade board. Expect 15 to 20 years with annual cleaning and re-staining every two to three years (expect a shorter run if you skip the upkeep).
Redwood is also increasingly a regional buy. Old-growth stock is effectively gone from the market, and most redwood sold today is younger second-growth with a higher sapwood fraction and less decay resistance than the boards that built the material's reputation. Outside the West Coast, freight can push it past materials that outlast it.
Neither species is a bad choice. If you like the look, plan for regular maintenance and replace the deck once during in your time in the house. If you'd rather buy once, the best wood for decks in your situation is further down this page.
Pressure-treated pine is the most affordable deck wood available and by far the most common, at roughly $1-$3 per linear foot. It's easy to cut, universally stocked, and perfectly adequate as framing.
It’s worth understanding what "treated" means. Southern yellow pine has almost no natural decay resistance, so preservatives — today usually micronized copper azole or alkaline copper quaternary — are forced into the wood under pressure. That's what buys the rot resistance.
The older CCA formulation used arsenic and was pulled from residential use in 2003. Modern copper-based treatments are a real improvement, but they’re still added chemistry sitting on your deck, and that's the trade you're making for the price.
Composite blends wood flour with plastic; PVC skips the wood entirely. Both deliver what they promise: color consistency, no sealing, no splinters. Quality capped composite runs 25–30 years at $4-12 per linear foot.
Where it falls short:
Composite is the right answer for someone who wants to do nothing for 25 years and doesn't care that it isn't wood.
This category takes a fast-growing softwood and changes it so it behaves like a hardwood. Thermally modified wood (Thermory, Lunawood) is baked at very high temperatures to strip out the sugars fungi feed on. Acetylated wood (Accoya) chemically alters the cell walls so they stop absorbing water.
Both work. Dimensional stability is genuinely excellent — better than most natural hardwoods — and the products carry serious warranties. Expect$5-10 per linear foot and a 25–35-year service life.
The trade-offs are real, too. Thermal modification reduces the wood's strength, so span and structural use need attention. Production is energy-intensive. And because the technology is a couple of decades old, long-term field data is still thin compared to a species with a 200-year track record on American fence lines.
Ipe is the hardest, longest-lasting decking wood on the market, and no honest comparison pretends otherwise. At 3,680 lbf on the Janka scale, it roughly doubles black locust, carries a Class A fire rating, and installations routinely run 40 to 75 years.
Cumaru, garapa, tigerwood, and massaranduba sit in the same family at slightly lower density and price.
Where tropical hardwood gets complicated is everything around the board:
If you want the absolute maximum lifespan and the supply chain doesn't concern you, ipe is the answer. If it does, black locust is the closest domestic match — same durability class, no ocean freight, no CITES paperwork.
A deck board has one job: survive years of sun, rain, and foot traffic without rotting, warping, or splintering. Four properties decide whether it does.
Think of it like buying tires. The cheap set works fine for a while. The question is what you spend, and how often, over the next twenty years.
Black locust (Robinia pseudoacacia) is the most durable decking species native to North America, and it gets there without a single chemical. Pioneers used it for fence posts, house sills, and ship trunnels because it simply refused to rot in the ground, and modern lab work backs the folk knowledge.
The specs:
What makes it work is chemistry, not oil. Black locust heartwood is loaded with flavonoid extractives — robinetin and dihydrorobinetin — that fungi and insects can't digest. That resistance is grown into the wood. It doesn't wear off, and it doesn't wash into the soil beneath the deck.
The honest caveats. Black locust weathers to a silvery-gray patina if you leave it alone. That's cosmetic, not structural, but if you want the golden-brown tone to stay, you'll oil it once a year — same as ipe. The wood is dense enough that installers need to pre-drill and use stainless fasteners. And outside its native Appalachian range, black locust spreads aggressively and is treated as invasive in parts of the Midwest and West. Harvesting doesn't fix that on its own, though it does mean the supply isn't coming out of old-growth forest.
Material costs only, per linear foot. Installed cost varies with density and labor market — dense hardwoods carry a labor premium; softwoods and composite install faster.
| Material | Lifespan | Cost ($/lf) | Janka (lbf) | Maintenance | Rot resistance | Best for |
|---|---|---|---|---|---|---|
| Pressure-treated pine | 15–25 yrs | 1–3 | ~690 | High | Chemical | Budget builds, framing |
| Cedar/redwood | 15–20 yrs | 3–6 | 350–450 | Medium | Moderate, natural | Mid-range, DIY |
| Composite / PVC | 25–30 yrs | 4–12 | n/a | Low | n/a (plastic) | Zero-upkeep buyers |
| Thermally modified | 25–35 yrs | 5–10 | varies | Low-medium | Modified | Stability-critical work |
| Ipe / tropical hardwood | 40–75 yrs | 6–12 | 3,680 | Medium | Yes, natural | Maximum lifespan |
| Black locust | 50+ yrs | Request a quote | 1,700 | Low | Yes, natural | Long-life domestic builds |
Upfront price is the wrong number to compare. A deck's real cost is materials, plus installation, plus every gallon of sealer and every replaced board, divided by the years you get.
Run pressure-treated pine over 50 years, and you're buying it two or three times, sealing it roughly twenty times in between. A hardwood deck that lasts 50 years is bought once. That's why the cheapest board on the shelf rarely makes the cheapest deck.
Two costs people miss:
For a public boardwalk or a commercial rooftop, add one more line: closure cost. Shutting a walkway for a rebuild costs a municipality far more than the boards did.
The best wood for decks changes with the job.
Species choice sets the ceiling. Installation decides whether you reach it.
Black locust and ipe are the two materials where doing nothing is a legitimate maintenance plan. The wood keeps performing; it just changes color.
For maximum hardness and lifespan? Ipe. For the longest-lasting North American species with no chemical treatment, black locust. For a tight budget, pressure-treated pine. The best wood for decks is the one whose trade-offs you can live with for the next several decades.
It depends far more on species than on construction. Pressure-treated pine runs 15–25 years, cedar and redwood 15–20, thermally modified wood 25–35, black locust 50+, and ipe 40–75. Maintenance moves each of these by several years in either direction.
Black locust and ipe tie. Neither needs sealing, chemical treatment, or annual oiling to keep performing (oiling is purely a color choice). Both need pre-drilling at install and stainless fasteners. "Low maintenance" is not "no maintenance": every deck needs periodic cleaning to clear debris and stop moisture from sitting on the surface.
No. Ipe is harder, at 3,680 lbf against black locust's 1,700 lbf. Both land in EN 350 Durability Class 1, the top decay-resistance category, so both resist rot at the same rated level. Hardness governs dent and scratch resistance; durability class governs rot. Black locust is meaningfully harder than teak, white oak, and every softwood used for decking.
Composite wins on color consistency and on doing nothing for 25 years. Wood wins on lifespan at the top of the range, on surface temperature in the sun, and on end of life: a wood deck is biodegradable, while wood-plastic composite is effectively unrecyclable. If low upkeep is the goal but plastic isn't acceptable, a naturally durable hardwood gets you both.
No material is perfect. Naturally durable domestic hardwood scores well because it needs no preservatives, no ocean freight, and produces no plastic waste at end of life. Modified wood scores well on fast-growing feedstock but carries a heavy production energy load. Composite scores well on recycled input and badly on disposal. Tropical hardwood performs beautifully, but carries the hardest sourcing questions.
If you want a deck that outlasts your mortgage without a drum of chemicals under it, black locust is worth a sample in your hand.
We're a lumber supplier in Pennsylvania that works with one species and controls every step: sourcing, sawmilling, custom milling, and finished manufacturing, all in-house. That's why our boards come off the same line with the same grade and the same color, and why we can tell you exactly where a shipment came from. Our decking, siding, pavers, and boardwalks are installed on residential and commercial projects across the U.S. and Canada.
Here's what we'd suggest: Tell us what you're building, and we'll come back with real numbers: material, milling, and freight to your job site. Most conversations start with a rough sketch and a delivery date, and that's enough to work from.
Contact us for a project quote. If it helps you decide, we can send a sample to put outside and compare against whatever else you're considering.
Continue Reading
How Long Does a Wood Deck Last? 10 to 50 Years, by Species
Wood Siding: Types, Cost, Lifespan, and What Actually Lasts
Composite Decking's Heat Problem. And Why Black Locust Doesn't Have It
Outdoor Flooring Options Compared by Cost and Lifespan
