By Gal, Flooring Specialist at Portofino Flooring | Last updated: March 2026
Engineered hardwood can be installed three ways — click-lock floating, glue-down, or nail-down. For most homeowners, click-lock floating installation is the right choice: no glue, no nails, and no professional required. This guide covers all three methods with a focus on click-lock floating, using the exact specs for Portofino engineered hardwood.
For a complete overview of engineered hardwood including specs and pricing, see our Engineered Hardwood Complete Buyer's Guide.
Choosing your installation method
Before buying tools or starting prep, decide which installation method is right for your situation.
Click-lock floating — planks click together and float over the subfloor with no adhesive or fasteners. Best for: wood or concrete subfloors above grade, DIY installations, situations where the floor may need to be removed later. This is the method covered in detail in this guide.
Glue-down — full-spread adhesive applied to the subfloor, planks pressed into the adhesive. Best for: above-grade concrete subfloors, rooms with radiant heating, situations where a solid non-hollow feel is important. Requires the correct adhesive, notched trowel, and a 100 lb floor roller. Professional installation recommended.
Nail-down — planks blind-nailed through the tongue into a wood subfloor using a flooring nailer. The most traditional method, creates the most solid feel underfoot. Requires a plywood or OSB subfloor at least 3/4 inch thick. Professional installation recommended for nail-down.
What you need before you start (click-lock floating)
Tools required:
- Tape measure and pencil
- Pull saw, circular saw, or miter saw for cutting planks
- Tapping block and rubber mallet — use a hardwood-specific tapping block, not the foam type used for vinyl
- Pull bar for end rows
- Spacers (1/4 inch minimum) for expansion gaps
- Chalk line
- Moisture meter — essential for engineered hardwood
- Knee pads
Materials required:
- Portofino engineered hardwood planks — measure your room and add 10% for waste
- 6mil plastic moisture barrier for concrete subfloors
- Quality underlayment — unlike laminate and SPC vinyl, Portofino engineered hardwood does not have pre-attached underlayment. A 2–3mm foam or cork underlayment is required for floating installation
- Transition moldings for doorways
- Baseboards or quarter round to cover expansion gaps
Critical pre-installation requirements
Engineered hardwood is real wood — it responds to moisture and temperature in ways that vinyl and laminate do not. Three requirements are non-negotiable:
Moisture testing is mandatory. Before installing engineered hardwood, test the moisture content of both the subfloor and the planks. Use a pin-type moisture meter on wood subfloors — readings above 12% indicate excessive moisture that must be resolved before installation. For concrete subfloors, use a calcium chloride test or a plastic sheet test. Engineered hardwood should not be installed over concrete with relative humidity above 75%.
Acclimation is critical — 72 hours minimum. Open the boxes and stand planks on their long edges (do not lay flat in stacks) in the installation room. Allow 72 hours at normal room temperature (60–80°F) and normal humidity (35–65% relative humidity). This is longer than laminate or vinyl because real wood needs more time to adjust. Installing without full acclimation is the leading cause of gapping, cupping, and joint failure in engineered hardwood.
Maintain room conditions year-round. After installation, maintain indoor humidity between 35–65% year-round. Excessive dryness causes gapping between planks. Excessive humidity causes cupping. A whole-home humidifier or dehumidifier is worth the investment to protect an engineered hardwood floor.
Step 1 — Prepare the subfloor
Engineered hardwood has stricter subfloor requirements than vinyl or laminate. The subfloor must be flat within 3/16 inch over 10 feet — the same standard as laminate — but also within moisture limits that wood-based products require.
Wood subfloors:
- Must be at least 3/4 inch thick plywood or OSB — no particleboard
- Check for squeaks and soft spots — fix all before installing
- Drive any raised fasteners flush or below the surface
- Sand high spots, fill low spots with floor leveling compound
- Check moisture content — must be below 12% for the subfloor
- The moisture content difference between the subfloor and the engineered hardwood planks must be less than 4%
Concrete subfloors (floating installation only — above grade):
- Test for moisture — relative humidity must be below 75%
- Fill cracks and low spots with leveling compound, grind down high spots
- Install a 6mil plastic moisture barrier — overlap seams 8 inches and tape
- Allow all patching to fully cure before proceeding
Remove baseboards before installing — number them for reinstallation.
Step 2 — Install underlayment
Unlike Portofino SPC vinyl and laminate which have pre-attached underlayment, engineered hardwood for floating installation requires a separate underlayment.
Choose a 2–3mm foam or cork underlayment designed for hardwood floating floors. Do not use thick foam underlayments designed for laminate — too much compression under engineered hardwood stresses the click joints.
Roll out the underlayment across the entire floor area, perpendicular to the direction you will be installing planks. Butt edges together — do not overlap. Tape seams with underlayment tape. If using a moisture barrier on concrete, the barrier goes down first, then the underlayment on top.
Step 3 — Plan your layout
Direction: run planks parallel to the longest wall or parallel to the main light source from windows. In open-plan spaces, run in the same direction as adjacent rooms so the floor flows continuously.
Check the last row: measure room width and divide by plank width. If the last row would be less than 2.5 inches wide, cut the first row narrower to balance both sides.
Snap a chalk line parallel to the starting wall, offset by one plank width plus 1/4 inch. Starting off a straight chalk line rather than the wall ensures the floor stays true across the room.
End joint stagger: plan for at least 8 inches of offset between end joints in adjacent rows. As a practical rule, start every other row with a cut-off piece from the previous row — as long as it is at least 8 inches long.
Step 4 — Install the first row
Place 1/4 inch spacers against the starting wall — engineered hardwood expands more than vinyl and the gap is critical, particularly in rooms with significant seasonal humidity variation. In particularly large rooms (over 30 feet in any direction), increase the expansion gap to 1/2 inch.
Start in the left corner with the tongue facing the wall. Connect planks end-to-end along the first row by angling each new plank at approximately 20 degrees, aligning the tongue with the groove of the previous plank, and pressing down to engage the click lock.
Handle engineered hardwood with care. The real wood veneer and click lock system are more sensitive than vinyl click systems. Use a hardwood-specific tapping block — soft rubber or padded — rather than the hard plastic blocks sometimes used for vinyl. Over-aggressive tapping can split the tongue or chip the veneer edge.
Cut the last plank in the row to fit, leaving a 1/4 inch gap at the end wall. Save cut-off pieces 8 inches or longer for starting subsequent rows.
Step 5 — Install subsequent rows
Connect each new row to the previous row by engaging the long-side click lock. Angle the plank at 20 degrees, align with the installed row, and press down. Use the tapping block gently along the length of each plank to fully close the joint — work from one end to the other.
Maintain the 8-inch minimum end joint stagger throughout. Keep spacers against all walls as you progress.
Around door frames: undercut the door casing with a handsaw using a scrap piece of flooring as a depth guide. Slide the plank underneath rather than cutting around the casing — significantly cleaner result. The casing height for engineered hardwood will be slightly different from vinyl due to the thickness of the separate underlayment — account for this when setting the cut depth.
Be patient with click joints. Engineered hardwood click systems are generally tighter than vinyl systems. Do not force joints — if a joint is not engaging, check that the plank is properly aligned and angle it slightly differently before applying pressure. Forcing a misaligned joint can split the groove.
Step 6 — Install the last row
Measure the remaining gap, subtract the expansion gap allowance, and rip planks to width. Use the pull bar to engage the final row's long-side click lock — no room for the tapping block.
In large rooms where the floor has been moving as it was installed, double-check the expansion gap along the starting wall before finishing — floating floors sometimes creep slightly during installation.
Step 7 — Install transitions and trim
Remove all spacers. Check that the expansion gap is consistent around the entire perimeter.
Baseboards and quarter round: reinstall original baseboards or install new quarter round over the expansion gap. Nail to the wall only — never through the floor. The floor must move freely beneath.
Doorway transitions: T-molding between rooms on the same level, reducer where engineered hardwood meets a lower surface. Transitions are especially important with engineered hardwood — the floor needs to be able to expand and contract freely in both directions, and transitions allow for this movement at doorways.
Around kitchen boundaries: if engineered hardwood runs up to a kitchen where SPC vinyl begins, use a T-molding or reducer at the boundary. Never glue or fasten engineered hardwood to an adjacent floor section.
Step 8 — Final inspection, cleanup, and protection
Walk the floor pressing on each plank — listen for hollow spots or any planks that rock. Reseat any loose joints with the tapping block while you still have access.
Wait 24 hours before moving furniture back. Allow 72 hours before placing heavy furniture or area rugs.
Protect the finish from day one:
- Place felt pads under all furniture legs — metal and plastic feet will scratch the veneer
- Use a chair mat under rolling office chairs
- Place doormats at all exterior entries to catch grit before it reaches the floor
- Keep pet nails trimmed
First clean: damp mop with a hardwood-specific pH-neutral cleaner. Wring the mop thoroughly — never wet-mop engineered hardwood. Avoid steam mops entirely — steam forces moisture into the wood veneer and can cause permanent damage.
Common engineered hardwood installation mistakes
Skipping moisture testing. This is the single most common and most costly mistake. Moisture problems in engineered hardwood show up weeks or months after installation — by then the floor is fully installed and remediation is expensive. Test before installing, without exception.
Insufficient acclimation. 72 hours minimum. Real wood takes longer to acclimate than synthetic flooring. Installing too early is a leading cause of gapping in dry months and cupping in humid months.
Using the wrong tapping block. A hard plastic tapping block designed for vinyl can chip the veneer edge of engineered hardwood. Use a padded or rubber block designed for hardwood.
Skipping the expansion gap or using too small a gap. Real wood moves more than vinyl with seasonal humidity changes. In a large room, a 1/4 inch gap may not be sufficient — use 1/2 inch in rooms over 30 feet in any direction.
Installing below grade. Engineered hardwood is not suitable for below-grade basements regardless of moisture test results. The consistent moisture vapor environment below grade will eventually damage real wood construction.
Over-tapping or forcing joints. Engineered hardwood click systems are tighter than vinyl. Gentle and precise is better than forceful. A misaligned joint forced into place will crack or split.
Wet mopping during or after installation. Standing water on engineered hardwood is the fastest way to damage the veneer and void the warranty.
Frequently asked questions about engineered hardwood installation
Does Portofino engineered hardwood need underlayment for floating installation? Yes — unlike our SPC vinyl and laminate which have pre-attached underlayment, Portofino engineered hardwood requires a separate 2–3mm foam or cork underlayment for floating installation.
Can engineered hardwood be installed over concrete? Yes — above-grade concrete only, with a 6mil moisture barrier and a moisture test showing relative humidity below 75%. Not recommended for below-grade concrete.
How long does engineered hardwood installation take? A first-time DIYer completing click-lock installation typically finishes a 200 sq.ft room in 5 to 7 hours including subfloor prep and acclimation time. Glue-down and nail-down installations are longer and more complex.
Can engineered hardwood be installed over radiant heating? Yes — floating or glue-down installation over radiant heat is acceptable. Surface temperature must not exceed 85°F. Run the heating system at normal operating temperature for at least 3 weeks before installation to ensure the subfloor has reached equilibrium. Turn off 24 hours before and 24 hours after installation.
Can I install engineered hardwood myself? Click-lock floating installation is DIY-friendly for a careful, patient homeowner. Glue-down and nail-down installations require more experience and specialized tools — professional installation is recommended for those methods.
What causes gapping between engineered hardwood planks? Gapping is caused by low indoor humidity — usually in winter when heating systems dry out the air. Maintain indoor humidity between 35–65% year-round to prevent gapping and cupping.
Can engineered hardwood be installed in a basement? No — below-grade basement conditions are incompatible with engineered hardwood. SPC vinyl with a 6mil moisture barrier is the correct basement choice.
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Genuine 4mm hardwood veneer. Refinishable. Greenguard Gold certified. 25-year residential warranty. Free 12-inch samples available. Ships nationwide in 3 to 7 business days. 30-day return policy on unopened orders.
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