Creosote is extremely difficult to fully remove from railroad ties because it’s pressure-treated deep into the wood fibers, not just applied to the surface. Most homeowners repurposing old ties will get better results sealing the creosote in rather than trying to strip it out. That said, there are approaches for both removal and encapsulation depending on what you’re trying to accomplish.
Why Creosote Is So Hard to Remove
Railroad ties are pressure-treated with creosote oil, which forces the preservative deep into the wood grain. Unlike a surface stain or paint, creosote saturates the interior of the timber. It continues to leach out over years, especially in warm weather, producing an oily residue and a strong tar-like smell. The EPA considers creosote a potential carcinogen, which is the main reason people want it gone before using ties in landscaping, raised beds, or retaining walls.
Even ties that look dry and weathered on the outside still contain significant creosote internally. On hot days, you’ll often see dark, sticky patches reappear on surfaces you thought were clean. This “sweating” happens because heat draws the oil back to the surface.
Surface Cleaning With Solvents
If your goal is to reduce surface creosote for handling or cosmetic reasons, solvent-based cleaning can help. In lab testing, dichloromethane showed the highest extraction capacity for pulling creosote compounds out of railroad tie wood, completely removing the characteristic odor and discoloring the wood back toward its natural tone. A mixture of hexane and acetone ranked second in effectiveness.
These industrial solvents aren’t practical for most homeowners, though. For a DIY approach, the realistic options are:
- Acetone: Available at hardware stores. Apply generously with rags, scrub the surface, and wipe clean. It ranked third in extraction effectiveness in solvent testing. You’ll need good ventilation and chemical-resistant gloves.
- Trisodium phosphate (TSP): Mix with hot water per package directions and scrub the surface with a stiff brush. TSP is a strong degreaser that helps lift oily residue. Rinse thoroughly afterward.
- Pressure washing: A pressure washer at 2,500 to 3,000 PSI can strip loose surface creosote. Do this outdoors on a surface where you can collect the runoff, since the wash water will contain creosote compounds.
No surface cleaning method will remove creosote from the interior of the wood. You’re cleaning what’s on the outside, but the tie will continue to leach over time, especially in heat. Plan on repeating the process or following up with a sealant.
Sealing Creosote In With Epoxy
For most practical purposes, encapsulating the creosote is more effective than trying to extract it. A penetrating epoxy sealer reacts chemically with the toxic phenolic compounds in creosote, locking them into the wood permanently rather than just coating over them.
The process works like this: clean the surface first to remove loose residue, then apply two saturating coats of a clear penetrating epoxy sealer, allowing each coat to soak in fully before applying the next. The epoxy bonds with the creosote compounds at a molecular level, trapping them inside the timber. For maximum protection, follow with two coats of a marine-grade epoxy paint over the sealed surface. The paint adds a physical barrier on top of the chemical seal.
The tradeoff is appearance. Marine epoxy paint is opaque, so you won’t see the wood grain underneath. If the natural look of the timber matters to you, the penetrating epoxy alone provides a clear finish with chemical protection, just less total barrier strength.
Soil Contamination Near Railroad Ties
If you’re using railroad ties as garden borders, the soil contamination question matters more than what’s on the surface of the wood. Research on community gardens with creosote timber borders found that soil within 18 inches of the ties contained four times the concentration of harmful compounds compared to soil in the center of the plots, and five times the normal background levels. Most contamination dropped to near-background levels between 6 and 12 inches from the timber.
The good news is that most vegetables don’t absorb these compounds through their roots. The chemicals are hydrophobic, meaning they bind to soil particles rather than dissolving in the water that plants take up. One notable exception: carrots and other root vegetables with higher fat content may accumulate some contamination from direct soil contact. Peeling carrots grown near creosote-treated wood reduces this risk. Leafy greens can also pick up trace amounts from airborne particles settling on their leaves, though this is a minor pathway compared to direct soil contact.
If you’re set on using railroad ties near a garden, keep edible plants at least 18 inches from the timber. Line the inside face of the tie with heavy plastic sheeting to create a physical barrier between the wood and your growing soil.
What Not to Do
Burning creosote-treated wood is illegal in all states. It releases concentrated toxic compounds into the air, including known carcinogens. This applies to burning in fire pits, wood stoves, bonfires, and brush piles. Don’t sand railroad ties without respiratory protection either. Sanding creates fine dust loaded with creosote compounds that you’ll inhale directly.
Avoid using creosote-treated ties in enclosed spaces, near water sources, or anywhere children play. The EPA specifically recommends against residential use in these contexts. If you’re handling ties during removal or cleaning, wear chemical-resistant gloves and long sleeves. Creosote absorbs through skin on contact.
Disposing of Railroad Ties
If you decide the ties aren’t worth the effort, disposal requires some planning. Railroad ties are classified as construction and demolition debris, not regular household waste. Your options include contacting your local transfer station to ask if they accept them, reaching out to a construction debris processing facility, or renting a dumpster from a company that handles treated wood.
Some facilities require the ties to be cut into sections of 4 feet or less, or chipped before drop-off. Call ahead before loading up your truck. If you need to store ties on your property temporarily, keep the pile managed: no vegetation growing through it, no degradation, and a clear plan for where they’re going. Unmanaged piles can create environmental and nuisance issues that put you in violation of local regulations.