Engineered Hardwood Installation — Glue-Down, Nail-Down or Floating
Real wood on top, a plywood core underneath, and three ways to put it down. The right one depends on whether you have a slab, a plywood subfloor or an old floor you are covering.
JMB Builders does engineered hardwood installation across the Twin Cities metro three ways: nailed or stapled over a plywood or OSB subfloor, glued down over a slab or a floor that cannot take nails, or floated as a click or glued-edge plank over an underlayment. We pick the method by what is under the floor, flatten it, and finish with the undercuts, transitions and shoe. Priced per project, quoted from photos in one business day.
- Glue-down, nail-down or floating, chosen per subfloor
- Slab moisture-tested before any glue-down
- Undercuts, transitions and shoe included
- Quote from photos in 1 business day
- Licensed MN contractor BC809005
Engineered hardwood is a thin layer of real wood glued to a plywood or fiber core. The core is what makes it different from solid: it moves less with the seasons, it can go over concrete, and it comes in wide planks that would cup if they were solid. It also means the installation is a choice. Solid hardwood is nailed, full stop. Engineered can be nailed, glued or floated, and the wrong choice for the subfloor is where these floors fail.
Nail-down is the standard over a wood subfloor on the main and upper floors: fast, quiet underfoot, and the plank is fixed for good. Glue-down is the answer over a concrete slab, over a subfloor that will not hold cleats, and in big open rooms where a floating floor would drum. Floating is the fastest and the easiest to take back up, and it is fine in bedrooms and small rooms, but it moves as one sheet and sounds hollow under a hard heel if the underlayment is thin.
Whatever the method, the floor under it has to be flat. Engineered planks are stiff and wide, and a hump or a dip that a carpet hid shows as a rocking board or an open joint. We grind or fill the subfloor to the flatness the plank maker calls for before the first board goes down.
What you supply
- The planks, with extra for cuts and the first row, and the matching transitions and stair nose if the maker sells them
- The install method if you have a preference, or let us pick it from the subfloor
- Rooms cleared of furniture, or tell us and we will quote moving it
- Your call on shoe mould vs. new baseboard, and whether we paint it
What JMB supplies
- Removal and haul-away of the old flooring, tack strip and staples
- Subfloor check: flatness with a straightedge, screws to stop squeaks, moisture test on a slab
- Floor patch, self-leveler or grinding to flatten to the plank maker's tolerance
- Nail-down: rosin paper or underlayment, cleats or staples at the spacing the plank calls for
- Glue-down: the adhesive the plank maker specifies, troweled at the right notch, with a moisture barrier where the slab needs one
- Floating: underlayment with a vapor layer on concrete, expansion gap at every wall and fixed object
- Jamb and casing undercuts, transitions, stair nose, and the base and shoe reset or new shoe
- Doors trimmed if they no longer clear the new floor
- Photos of the finished floor in your job folder
- Painting of new shoe or base when you want it, quoted as its own line
How it is priced: per project
Quoted in writing from your photos within one business day. What moves the number:
- Method: nail-down is fastest, glue-down takes adhesive and more prep, floating sits between
- What is under it: a plywood subfloor, a slab that needs a moisture test and barrier, or an old floor coming out
- Flattening: a few low spots patched vs. a whole room ground or leveled
- Plank width and pattern: wide planks and herringbone take more layout and more cuts
- Room shape, closets, and the number of doorways and transitions
- Stairs, which take a nosing and a different install than the field
- Baseboard and shoe: reset the old, new shoe, or new base, and whether we paint it
Send a photo of the room, a photo of the plank box or label, and a photo of what the floor is now. Say whether it is on a slab or over a basement. That decides the method and the quote.
How long it takes
A couple of bedrooms, floated or nailed: one to two days. A main floor with kitchen and living room, nailed: three to four days including trim. Glue-down adds about a day; leveling adds a day before that.
How your project works
- 1
Send photos, get a written quote
Send three photos of the space and a sentence about what you want. You get a clear, itemized quote within one business day. We only come out to measure first when the job needs a tape measure — no pressure, no games.
- 2
Pick materials, or bring your own
We help you choose profiles and materials that fit the house and the budget, or match your existing millwork exactly — or you buy the door or trim yourself and we install it. Everything is confirmed before the crew is scheduled.
- 3
Clean, precise installation
The crew shows up on time, protects floors and furniture, and installs with tight joints and consistent reveals. Photos of the finished work go in your job folder.
- 4
Walkthrough and invoice
We walk the finished work with you. If anything is not right, we fix it before we call the job done. Then one invoice, paid by check or direct deposit — no card fees, no payment links.
Situations and options
Nail-down over plywood or OSB
The standard on main and upper floors. Paper or underlayment down, planks cleated or stapled through the tongue at the spacing the maker calls for, first and last rows face-nailed and filled. Solid underfoot and fixed for good.
Glue-down over a concrete slab
Slab tested for moisture first, then a moisture barrier if the reading calls for it, then the maker's adhesive troweled and the planks set into it with the joints pulled tight. Right for basements, slab-on-grade houses and condos over concrete. Solid hardwood cannot do this.
Floating on underlayment
Click-together or glued-edge planks laid over a foam or cork underlayment, with a vapor layer on concrete. Fastest to install, easiest to remove, fine in bedrooms and small rooms. In big open areas we say when glue-down is the better call.
Over an existing wood floor
An old strip floor that is flat and tight can stay as the subfloor. New planks run at an angle or across the old boards, nailed or glued, after the old floor is screwed down and the high edges sanded. Saves the tear-out.
Engineered Hardwood Installation — Glue-Down, Nail-Down or Floating: questions, answered
Should engineered hardwood be glued, nailed or floated?
It depends on what is under it. Over a plywood or OSB subfloor, nail-down is the standard and the most solid underfoot. Over a concrete slab, glue-down, with a moisture test first. Floating works over either and is the fastest, but it moves as one sheet and can sound hollow in a big room. We look at the subfloor and the plank you picked and say which one, and why, before you buy the adhesive or the underlayment.
Can engineered hardwood go over a concrete slab?
Yes, and it is the reason most people buy it. The slab is tested for moisture first; a wet slab gets a moisture barrier under the glue or a floated floor over a vapor layer instead. Then the planks are glued down with the adhesive the maker specifies. Solid hardwood cannot go on a slab or below grade; it cups. If the slab tests very wet, LVP is the honest answer and we say so.
Does engineered hardwood need to acclimate?
Yes, though less than solid. The boxes sit open in the rooms where the floor is going, at normal living temperature and humidity, for the time the plank maker calls for, usually a few days. A house that is still drying out from construction or a basement that just got dehumidified needs longer. Installing planks straight off a cold truck is how gaps open up in January.
Can wide plank engineered hardwood be installed without gaps in a Minnesota winter?
Yes, if the house is kept at a steady humidity. Engineered planks move far less than solid, which is why wide planks come engineered, but the top layer is still wood and shrinks a little in dry winter air. A humidifier on the furnace keeps the joints tight. We also glue-assist wide planks on a nail-down so an individual board cannot lift at the edges.
Can engineered hardwood be refinished?
Once or twice, depending on how thick the top wood layer is. A thick wear layer takes a full sand and refinish like a solid floor; a thin one can only be screened and recoated. It is worth checking the wear-layer thickness on the box before you buy if you want the floor to last through a refinish. We will read the spec for you before you order.
Do you install engineered hardwood I bought myself?
Yes. Buy it anywhere, have it delivered, and we install it with the method the maker calls for. Send a photo of the box label and a photo of the room before you order and we will check the plank against your subfloor, tell you how much extra to buy for cuts, and say whether the adhesive or underlayment the store suggested is the right one.
Recent JMB work, from our job log
59 installs recorded across 30 Twin Cities communities since Dec 2025. Window and door installs for homeowners and for the builders and dealers we sub for. Counts come straight from our job log; no customer names.
Get a written quote for this job
Three photos and a sentence is enough. You hear back within one business day. Or text the photos to 763-204-2099.
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Read morePage reviewed September 26, 2026 · JMB Builders LLC, MN license BC809005 · All flooring pages
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