Choose 3/4-inch hardwood when you have a wood subfloor and want a floor you can sand and refinish many times. Choose 1/2-inch when height, weight or a non-wood subfloor limits you, and look at the construction as well as the thickness. Thickness decides how much wood sits above the tongue, how the board is fastened, and how long the floor can last. It barely changes how the floor looks once it is down.

Below, we explain what each thickness means in practice, how they differ at the subfloor, and how to decide for a Michigan home or jobsite.

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TL;DR

  • 3/4-inch is the standard thickness for solid hardwood in residential construction. It can usually be refinished four or more times.
  • 1/2-inch boards are thinner and lighter. They are fastened with smaller nails at tighter spacing, and they suit projects where floor height matters.
  • Thickness does not change the look of an installed floor. It changes how many times the floor can be sanded.
  • For engineered hardwood, the wear layer matters more than total plank thickness.
  • Over concrete, engineered hardwood is generally the practical choice. Over a wood subfloor, solid 3/4-inch is the classic one.

Table of Contents

What the two thicknesses actually are

A 3/4-inch board measures 19.05 mm. A 1/2-inch board measures 12.70 mm, according to the conversion table in the NWFA installation guidelines. That is a difference of about 6 mm, or roughly a quarter inch.

Solid wood floors are cut from a single piece of timber and are usually 3/4 inch thick. The American Hardwood Information Center describes solid flooring as usually 3/4 inch and usually nailed to a wooden subfloor.

A 1/2-inch board can be one of two things:

  1. A thinner solid board, which is less common today.
  2. An engineered board, with a real-wood top layer bonded to plywood or other core layers.

The NWFA guidelines say finished engineered flooring ranges from 3/8 inch to 3/4 inch thick. So “3/4 vs 1/2” is often a comparison between a solid board and an engineered one. It can also be a comparison between two engineered boards with different total thickness.

Refinishing life: where thickness matters most

A floor wears from the top. The wood above the tongue is the part you can sand, so that is the part that sets the floor’s lifespan.

Fine Homebuilding notes that solid 3/4-inch flooring can be refinished four or more times before it needs replacing. Each sanding removes about 1/16 inch of material. The same article makes a point worth keeping in mind: the thickness of the wood above the tongue determines how many times a floor can be sanded, and once it is installed you cannot see the thickness.

In plain terms:

  • 3/4-inch solid gives you the most wood to sand. For a family that plans to stay in a house for decades, that is a real advantage.
  • 1/2-inch boards have less wear material, so fewer refinishes are available. If the 1/2-inch board is engineered, the question is the thickness of the top layer, not the whole plank.

Engineered boards: read the wear layer, not the plank

Two engineered planks can both be 1/2 inch thick and have very different wear layers. One may have a thin veneer that can handle a light screen and recoat only. The other may have a thick sawn lamella that can be sanded more than once.

We cover this in more detail in our guides on how to measure engineered wear layer thickness, how much wear layer is usually enough, and whether your engineered floor is refinishable. For the lifespan question, see our engineered hardwood lifespan article.

If you are comparing a 1/2-inch engineered board with a 3/4-inch solid board, ask for the wear layer measurement in the product specs. That number tells you more than the headline thickness.

Side-by-side comparison

Factor 3/4-inch hardwood 1/2-inch hardwood
Typical construction Solid, sometimes engineered Engineered, sometimes thin solid
Material above the tongue Most Less, varies by product
Refinishing potential Four or more sandings for solid Fewer, depends on wear layer
Weight Heavier Lighter
Fastener size 15.5g to 18g cleats or staples 18g to 20g cleats or staples
Fastener spacing (nail-down) 6-8 inches (plank), 8-10 inches (strip) 3-4 inches
Best subfloor Plywood, OSB, wood plank Wood, and many engineered options also work over concrete
Floor height Adds more height Adds less height

The fastening figures come from the ProInstaller nail-down guide. It specifies 3/4-inch solid plank flooring (at least 3 inches wide) with 15.5, 16 or 18 gauge cleats or staples at 6 to 8 inch intervals. Solid strip flooring at 3/4 inch uses 8 to 10 inch intervals. For solid tongue-and-groove flooring 1/2 inch thick or less, it calls for 18 to 20 gauge cleats or narrow-crowned 18 gauge staples at 3 to 4 inch intervals, with fasteners at least 1 1/4 inches long.

Always follow the manufacturer’s installation sheet for the exact product. It overrides general charts.

Side-by-side comparison

Subfloor and installation: the deciding factor for most projects

Most people pick thickness for durability and then discover the subfloor made the decision for them.

Wood subfloors

Solid wood flooring needs a nailable surface. A wood-framed floor with plywood or OSB underlayment is the classic setup for 3/4-inch solid. The thicker board is stiff and carries more of the load between joists, but the subfloor still needs to be flat, dry and sound.

A 1/2-inch board over an uneven or springy subfloor can feel hollow underfoot. Flatten the subfloor first. Sanding high spots and filling low ones takes less time than chasing squeaks later.

Concrete slabs and basements

This is where 3/4-inch solid usually drops out. Solid hardwood is a poor match for slab-on-grade and below-grade spaces because it reacts to moisture. Engineered hardwood, by contrast, can be installed over concrete and most other subfloor types and is more stable, since it reacts less to moisture changes, as the American Hardwood Information Center explains.

For Michigan slabs, moisture testing is the first step, and we lay out the standards in our guide to ASTM moisture rules for engineered hardwood on concrete. Our comparison of the best flooring over a concrete slab walks through the other options. If the space is a damp basement, it also helps to read about waterproof flooring for basements before you commit to any wood product.

Radiant heat and floor height

Thinner engineered boards often suit radiant-heat floors and spots where a new floor must meet an existing threshold or cabinet toe-kick. If you are replacing a floor, check the height of doors, appliances and transitions before choosing 3/4 inch. A thinner board can save you from trimming doors or building ramps.

Stability and dent resistance

The woodfloordoctor site describes 3/4-inch strip flooring as the most stable and durable option in North America. It also suggests keeping the board width to no more than four times its thickness, so a 2 1/4-inch strip at 3/4 inch is a very stable combination. We would not treat that as a law of nature, but the logic holds: wide boards move more with the seasons, and a thicker board resists that movement better.

For Michigan homes, this matters. Winters are dry with the heat on, and summers can be humid. Wood responds to both. A few habits help any thickness:

  • Let the wood acclimate to the house conditions before installing.
  • Keep indoor humidity in a steady range.
  • Match the board width to the thickness. Very wide planks are best in engineered construction.
  • Fix moisture sources first. If you already see edges rising, read how to deal with cupping before you sand.

Dent resistance comes mostly from the species and the finish, not from the thickness. Oak, maple and hickory all have different hardness. Hickory and hard maple are popular choices for busy households.

Cost: what you pay now and later

Thinner boards often cost less per square foot to buy and ship, and engineered options can cut installation time over concrete. Solid 3/4-inch carries a higher material cost in many species but gives you more years between replacements.

The cost that people forget is refinishing. Our published range for professional floor refinishing is $3-$8 per sq ft, and spot repair and refinish runs $200-$600 per area. A floor with more material above the tongue can be refinished more times before replacement, which spreads the cost of the floor over more years. Our spot repair and refinish page has the details.

How to choose: a quick decision guide

Pick 3/4-inch solid if:

  • You have a plywood, OSB or plank subfloor on a framed floor.
  • You plan to stay for years and want multiple refinishes.
  • You are matching an existing 3/4-inch floor in an adjoining room.
  • The space has stable humidity and is above grade.

Pick 1/2-inch (usually engineered) if:

  • Your floor sits on concrete or you want a floating or glue-down install.
  • Floor height is limited by doors, cabinets or stairs.
  • You want wide planks with less seasonal movement.
  • You have a radiant-heat system and need a stable board.

Consider 3/4-inch engineered if: you want a thick top layer and the stability of cross-layered construction. It is often a strong middle path. Our engineered vs. solid comparison covers it for Michigan conditions.

Replacing an old floor

If you are tearing out 3/4-inch red oak and replacing it, matching the old thickness is the easiest route in the room. It keeps transitions flush and avoids rework at doorways. If you are changing to engineered, plan your transition strips ahead of time.

Promo: see samples and get contractor pricing

We stock solid, engineered and unfinished hardwood from more than 36 brands, along with stains, finishes and abrasives. You can browse our hardwood and engineered selection, visit the showroom, or ask for a quote by phone or online. Contractor pricing is available to all buyers, and we offer local pickup or statewide delivery.

Quality Hardwoods of Michigan, Inc

We do not install floors ourselves, but we can refer you to installers we know. For a first look at the engineered range, see our engineered hardwood flooring. If you want help matching a board to your subfloor, our team can talk through it with you.

Our perspective

We spend a lot of time on jobsites, and the thickness question comes up almost every week. Our honest answer is that the board does not fail first. The subfloor, the moisture and the installation usually decide how the floor performs.

When a customer has a wood subfloor and plans to stay, we point to 3/4-inch solid, because the extra wood above the tongue is the best insurance you can buy for the long run. A well-made 3/4-inch floor can go through several refinishes and still look new.

When the floor is on concrete, or height is tight, we steer people to engineered, and we ask for the wear layer number before anything else. A good engineered board with a real wear layer is a smart, durable floor, and our selection covers many species, widths and finishes.

With more than 36 brands on hand, we can usually put both options side by side in the showroom, so you can see the grain, feel the weight and decide with real samples in your hands.

Mike Solomich

FAQ

Is 3/4-inch hardwood better than 1/2-inch?

For refinishing life, usually yes, since there is more wood above the tongue. For concrete subfloors, tight floor heights or radiant heat, a 1/2-inch engineered board can be the better fit. The best board is the one that suits your subfloor and your plans.

What is a good thickness for hardwood floors?

Solid flooring for residential construction is typically 3/4 inch thick, according to Fine Homebuilding. Engineered flooring commonly runs from 3/8 to 3/4 inch, per the NWFA guidelines. For engineered, focus on the wear layer.

Can you install 1/2-inch hardwood over the same subfloor as 3/4-inch?

Often yes, but the fastening changes. Solid boards at 1/2 inch or less use smaller-gauge fasteners at 3 to 4 inch spacing, per the ProInstaller guide. Follow the manufacturer’s sheet for your product.

Can I install hardwood over concrete?

Engineered hardwood can be installed directly over concrete and most other subfloor types, according to the American Hardwood Information Center. Test moisture first. Solid 3/4-inch is typically nailed to a wood subfloor.

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