Floating, glue-down, and nail-down are the three main ways solid hardwood, engineered hardwood, laminate, and vinyl plank actually get installed. The right flooring installation method comes down to your subfloor and your material, not which method is objectively best.
Get the match wrong and you feel it later. A floating floor over an uneven subfloor sounds hollow underfoot. A glue-down job on a subfloor that was not moisture-tested can fail at the bond line. A nail-down floor cannot go over bare concrete without extra prep first. Get it right, and the installation method mostly disappears, as it should, into a floor that just works.
Here is what each method actually involves, which materials and subfloors it fits, and how to land on the right one for your project.
What Is a Floating Floor Installation?
A floating floor is never nailed or glued to the subfloor. The planks click together at the edges and simply rest on top, held in place by their own weight, the room's walls, and a small expansion gap left around the perimeter.
This is the standard method for laminate, and it is how most rigid-core vinyl (SPC and WPC) is built to go down, plus a good share of click-lock engineered hardwood. An underlayment layer, either pre-attached to the plank or rolled out separately underneath, sits between the floor and the subfloor for cushioning and sound control.
Floating works over almost any flat, dry subfloor, including a concrete slab, existing vinyl or tile, or plywood. Flatness matters more here than with either other method, since nothing is fastening the floor down to correct for a dip or a high spot. The perimeter gap lets the floor expand and contract with temperature and humidity instead of buckling against the walls.
The honest trade-off: because nothing anchors it to the subfloor, a floating floor can sound a little hollower underfoot than a glued or nailed one, especially without a quality underlayment. It is also the most DIY-friendly of the three methods by a wide margin, which is why it is worth reading our full explainer on how floating floors work before you start.
What Is a Glue-Down Installation?
A glue-down installation bonds the flooring directly to the subfloor with a full spread of adhesive, troweled on in ridges before the planks go down.
It is the common choice for engineered hardwood and vinyl plank or sheet over a concrete slab, especially below grade or anywhere in-floor heating is involved, since full contact with the subfloor helps heat move through the floor more evenly than a floating installation does. The subfloor needs to be flat, clean, and moisture-tested first. Over concrete, a vapour retarder is frequently part of the prep.
Because it is bonded rather than resting loose, a glue-down floor feels firmer and quieter underfoot than a floating one, with none of the slight give a click-lock system can have. That solidity comes at a cost: it is a more skill- and labour-intensive job to do well, and a damaged plank is far harder to lift and replace than one in a floating floor.
What Is a Nail-Down (or Staple-Down) Installation?
Nail-down, or staple-down, fastens each plank mechanically through its tongue at an angle, into a wood subfloor underneath. It is the traditional method for solid hardwood, and it is still used for some engineered hardwood built with a tongue thick enough to take a fastener.
This method needs an actual wood subfloor, commonly 3/4 inch plywood. It cannot go directly over a concrete slab. Getting a nail-down floor over concrete means building up a plywood subfloor first, which adds cost and raises the finished floor height, so it is worth confirming with us before you commit to this method over a slab.
Nail-down is generally considered the most stable long-term method for solid hardwood, and it is a big part of why a solid hardwood floor can be sanded and refinished multiple times over its life. It is also the most tool-intensive of the three to take on yourself, since it calls for a pneumatic flooring nailer rather than hand tools alone.
One more honest distinction worth knowing: for a floor going over radiant in-floor heating, floating or glue-down are the methods generally recommended for solid hardwood, not nail-down. Solid hardwood moves more with temperature and humidity than engineered products do, and most manufacturers will not warranty 3/4 inch solid hardwood over radiant heat at all, regardless of installation method. If in-floor heat is part of your plan, that is a conversation to have before you settle on a wood product, not after.
Which Installation Method Fits Your Situation?
Use this as a starting point, then confirm the specific product's own installation instructions, since not every plank in a category is built for every method.
| Method | Typical Materials | Subfloor Needed | DIY Friendliness | Underfoot Feel |
|---|---|---|---|---|
| Floating | Laminate, SPC/WPC vinyl, click-lock engineered hardwood | Concrete or wood, must be flat | Easiest, common DIY project | Can sound hollow without good underlayment |
| Glue-down | Engineered hardwood, vinyl plank or sheet | Concrete or wood, flat, clean, moisture-tested | Moderate, needs adhesive experience | Firm and quiet, no movement |
| Nail-down / staple-down | Solid hardwood, some engineered hardwood | Wood subfloor only, typically 3/4 inch plywood | Hardest, needs a flooring nailer | Solid, traditional hardwood feel |
What About Stairs?
A floating floor is not the right call for stairs, and this is a safety issue, not just a performance trade-off. Floating systems are designed to shift slightly with temperature and humidity, while a stair tread needs to stay exactly where it is put every single time someone steps on it. Standard floating planks are not built or rated for that.
If you are carrying a floating floor from an adjoining room onto a staircase, expect a hybrid approach: the field of the room floats, while the stair treads themselves get glued, nailed, or fitted with dedicated stair-nosing hardware built specifically for that job.
Should You DIY It or Call In a Pro?
Floating floors are the most realistic DIY option of the three, which is a big part of why they are so popular for weekend renovation projects. A glue-down or nail-down job asks more of the installer: even adhesive spread, real experience with a flooring nailer, and a lower tolerance for mistakes once the floor is bonded or fastened down. Reviewing a full pre-installation checklist and the most common installation mistakes before you start is worth the half hour regardless of which method you choose.
If you are working with vinyl specifically, our guide to vinyl flooring installation techniques goes deeper on the floating-versus-glue-down decision for that material in particular.
Word of Mouth Floors offers professional installation in the BC service area (Metro Vancouver, Whistler, Victoria, Kelowna, and surrounding communities). Outside BC, we supply the product and you arrange your own installer, and any of the guides above will help you brief them on what the job actually involves.
Frequently Asked Questions
A few quick answers to the questions that come up most often once you know which method you are leaning toward.
Can a floating floor go over a concrete slab?
Yes. Floating is one of the easiest methods to use over concrete, as long as the slab is flat and dry. It also does not require the moisture-testing and vapour-retarder prep that glue-down over concrete typically needs, since nothing is bonding directly to the slab.
Do I need underlayment under a floating floor?
In almost every case, yes. Some products come with underlayment pre-attached to the plank; others require a separate underlayment rolled out first. Skipping it is the single most common reason a floating floor feels or sounds hollow underfoot.
Can solid hardwood be glued down instead of nailed?
It happens, mostly over concrete in commercial settings, but nail-down remains the standard residential method for solid hardwood. If you are set on solid hardwood over a concrete subfloor at home, ask us about it directly. It is a real option, just not the default one.
Does the installation method affect whether a floor is waterproof?
No. Waterproofing is a property of the material itself (vinyl is waterproof, laminate is water-resistant, hardwood is neither), not of how it is installed. A floating vinyl floor and a glue-down vinyl floor are equally waterproof. The installation method changes how the floor performs and feels, not what it is made of.
Which method is quietest underfoot?
Glue-down, generally, since the adhesive bond dampens sound and movement that a floating floor's loose fit can allow. A floating floor with a good, dense underlayment closes most of that gap, but it rarely closes it completely.
Not sure yet which material makes sense for your subfloor and your installation plan? Order a free sample and see how it looks and feels in your own space before you commit. Have a question about your specific subfloor or project? Contact us and we will help you figure out the right fit.
— The Word of Mouth Floors team
hello@wordofmouthfloors.com · (888) 966-3579