Solid or engineered hardwood? The honest way to choose

On this page

1. What actually differs
2. What's under the floor
3. What the room goes through
4. How long you're staying
5. Room by room
6. Three myths
7. Reading a spec sheet
8. FAQs
9. Sources

Most people start this decision in the wrong place. They compare samples, pick the one that looks better, and then ask whether it is solid or engineered. In a showroom the two look identical, because the top layer is the same oak, hickory, or walnut. What separates them is how they behave in your particular house, and that comes down to three questions: what is under the floor, what the room goes through in a year, and how long you plan to stay.

What actually differs

Solid hardwood is a single piece of wood from top to bottom. The standard thickness is 3/4 inch, and it is nailed to a wood subfloor. Every fraction of that thickness above the tongue can be sanded, which is why solid floors in century-old West Chester homes are still in service on their third or fourth owner.

Engineered hardwood is a real hardwood face, called the wear layer, bonded to a layered core of plywood or fiberboard. The face is the same species you would buy in solid. The core runs in crossing directions, so the plank resists the swelling and shrinking that moves solid wood. That stability is the whole reason engineered exists.

A solid floor's lifespan comes from how many times it can be sanded. An engineered floor's comes from staying flat and tight in a room where solid would struggle.

Question one: what is under the floor?

Start at the subfloor, because it rules out options before taste comes into it.

A plywood or OSB subfloor on an upper level is the classic home for solid hardwood. It takes nails well, and the room sits above the ground moisture that troubles wood. Most Chester County homes built before the 1990s, and plenty built since, have exactly this on their main and upper floors.

A concrete slab changes the answer. You can't nail solid hardwood to concrete, and a slab carries moisture up from the ground. Engineered planks can be glued directly to a slab or floated over it on an underlayment, which is why many newer slab-on-grade builds go engineered.

Basements are the clearest case. The National Wood Flooring Association's installation guidelines do not recommend solid wood below grade. Engineered can work in a basement after a moisture test and with the right glue or underlayment. For a basement that has ever been damp, our honest advice is to skip wood and look at luxury vinyl plank, which shrugs off water that would ruin any hardwood.

Question two: what does the room go through in a year?

Wood takes on moisture in a humid Delaware Valley July and gives it back in a dry, furnace-heated January. Solid boards swell and can cup in summer, then shrink and show gaps in winter. The NWFA recommends keeping indoor humidity between 30 and 50 percent, at 60 to 80 degrees, year-round. Homes that hold that range keep solid floors tight. Homes that don't are better served by engineered, which moves far less.

Radiant floor heat makes this sharper. The heat dries the wood from below, unevenly and on a schedule, and solid planks rarely handle it well. Engineered is the usual choice over radiant, but only a product the manufacturer specifically approves for radiant heat. Ask to see that approval in writing before you buy.

Kitchens and mudrooms sit in the middle. Both constructions work above grade in a kitchen if spills get wiped up. Neither tolerates standing water, and a slow dishwasher leak will damage either one.

Question three: how long are you staying?

This is where solid earns its reputation. A 3/4-inch solid floor can be sanded and refinished several times, and each refinish makes it look new. A busy household typically refinishes every ten to fifteen years. Over a long ownership, that adds up to a floor that is never replaced.

An engineered floor's refinishing future is written on its spec sheet. The NWFA's rule of thumb is that a wear layer thinner than 2.5 millimeters, about 3/32 of an inch, should not be sanded. At 2.5 millimeters or more, a floor can typically be refinished once, sometimes twice. Thin-veneer engineered floors are built to be replaced rather than refinished, and that is fine for a condo or a ten-year plan. It is a poor fit for a forever house.

If you are matching an existing solid floor, the decision is usually made for you. Extending the narrow red oak strip found in many older West Chester homes means solid red oak in the same width, sanded and finished together so the old and new read as one floor.

Room by room: what we would put down

Our rule, the one we would follow in our own homes:

• Main or upper floor, plywood subfloor, staying long-term: solid. It is hard to beat for a floor you will refinish rather than replace.
• Main floor of a slab-on-grade house: engineered, glued down.
• Basement: engineered after a moisture test, or luxury vinyl if there is any history of water.
• Radiant heat: engineered, with the manufacturer's radiant approval.
• Condo or apartment over concrete: engineered with a sound-rated underlayment. Check your association's flooring rules first; many specify a minimum sound rating.
• Adding onto an existing solid floor: solid, matched in species and width.
• Kitchen open to a solid-floored living room: match the living room so the floor runs through without a seam.

Three myths worth retiring

"Engineered isn't real wood." It is. The surface you walk on is solid hardwood; only the core is layered. Engineered is not laminate, which is a photograph of wood, and not vinyl.

"Engineered can't be refinished." Some can't, and some can. It depends entirely on the wear layer thickness, so read the spec before you buy.

"Solid always lasts longer." Only in the right room. Solid oak in a damp basement can fail in its first summer, while engineered in the same room can last for decades. The longer-lived floor is the one suited to the space.

How to read a hardwood spec sheet

Before you commit to any plank, find these five lines on the manufacturer's spec sheet, or ask us to pull them:

1. Construction: solid, or engineered with a plywood or fiberboard core.
2. Wear layer: in millimeters. 2.5 or more if you want the option to refinish.
3. Approved installation methods: nail, glue, float.
4. Approved locations: above, on, or below grade, and over radiant heat.
5. Finish and warranty: the factory finish type and what the finish warranty covers.

Boyle's carries solid and engineered hardwood from Shaw, Anderson Tuftex, Bruce, Mirage, Mullican, and Wickham. Compare species, hardness, and finishes on our hardwood page, or see what refinishing an existing floor involves before you replace anything.

Frequently asked questions

Is engineered hardwood cheaper than solid?

Not always. Price depends more on species, plank width, grade, and wear layer thickness than on construction. A wide-plank engineered white oak with a thick wear layer can cost more than a standard solid red oak strip.

Can you tell the difference once it's installed?

Usually not by looking. A floated engineered floor can sound slightly hollower underfoot than a nailed solid floor; a good underlayment closes most of that gap.

Which is better for dogs?

Hardness and finish matter more than construction. A hard species such as hickory or white oak in a matte finish hides wear best, in either solid or engineered.

Can engineered hardwood go in a bathroom?

We don't recommend any hardwood in a full bathroom. Tile or luxury vinyl handles the water far better.

How long does solid hardwood last?

With periodic refinishing, a solid hardwood floor can outlast the house's other finishes by decades. Refinishing every ten to fifteen years in a busy household keeps it looking new.

Sources and references

1. NWFA/NOFMA Unfinished Solid Wood Flooring StandardNational Wood Flooring Association · nwfa.org
2. Refinishing engineered wood flooring, Hardwood Floors magazine, Aug/Sept 2022National Wood Flooring Association · nwfa.org
3. NWFA Wood Flooring Installation GuidelinesNational Wood Flooring Association · nwfa.org