Choosing SPC flooring by thickness sounds simple at first. Pick the thickest board your budget allows, and you are done. In practice, it is more nuanced than that.
A 5.7mm plank, a 6.5mm plank, and an 8mm plank can all be excellent choices, but they suit different rooms, expectations, and subfloor conditions. The best result comes from matching the board to the way the space will be used, the condition of the floor beneath it, and the feel you want underfoot.
Why thickness matters more than many people expect
SPC flooring is valued for its stability, water resistance, durability, and ease of care. Its rigid core helps it withstand temperature changes and day-to-day wear, making it popular in homes, apartments, retail spaces, and light commercial settings across New Zealand.
Thickness affects several practical things at once. It influences how solid the floor feels, how much minor subfloor variation it can forgive, how much sound it absorbs, and how premium it seems when you walk across it. Thickness also affects transitions to other floor finishes, door clearances, and the total floor build-up.
That said, thickness is not the only marker of quality. A thinner SPC board with a strong wear layer and a well-made core can outperform a thicker board of weaker construction. It is best to treat thickness as one part of the decision, not the whole decision.
After weighing up thickness, most buyers are really deciding between a few key outcomes:
- quieter rooms
- a firmer or softer feel underfoot
- better tolerance for slight subfloor imperfections
- easier renovation planning
- Sharper value for money
A quick comparison of 5.7mm, 6.5mm, and 8mm
These three thicknesses sit in a very useful part of the market. None of them is too thin for serious consideration, and none are so heavy-duty that they only suit specialist projects. The differences are meaningful, though, especially once installation and room use are taken into account.
| Thickness | Best suited to | Feel underfoot | Sound performance | Subfloor forgiveness | Budget impact |
| 5.7mm | Standard residential rooms, budget-conscious renovations | Firm | Good | Moderate | Lowest of the three |
| 6.5mm | Most homes, family living areas, balanced upgrades | More solid | Better | Good | Mid-range |
| 8mm | Premium residential, demanding spaces, comfort-focused projects | Most substantial | Strongest | Best | Highest |
When 5.7mm is the right call
A 5.7mm SPC floor is often a very sensible choice for bedrooms, home offices, rental properties, and renovations where floor height matters. If you need to keep transitions tidy or avoid trimming doors, this thickness can be very convenient.
It also appeals to buyers who want the benefits of SPC without paying for extra board mass they may not need. In a well-prepared room with a reasonably even subfloor, 5.7mm can perform very well. Many modern products in this thickness still offer attractive timber-look finishes, reliable click systems, and strong wear resistance.
The main point to keep in mind is that 5.7mm has less margin for error beneath it. If the slab or timber subfloor has noticeable dips, ridges, or movement, the floor may feel less substantial than a thicker option. Good preparation matters more here.
A 5.7mm board usually works best when these conditions apply:
- Subfloor condition: reasonably flat and properly prepared
- Project priority: cost control without giving up visual appeal
- Room type: lower to moderate traffic areas
- Build-up limits: tight floor heights or tricky transitions
Why 6.5mm often feels like the sweet spot
For many homes, 6.5mm lands in the middle of comfort, durability, and price. It is thick enough to feel more grounded underfoot than entry-level options, yet still practical for most renovations.
This thickness is especially appealing in open-plan living spaces, hallways, kitchens, and family areas where daily foot traffic is steady. It tends to offer a more confident step, slightly better acoustics, and a little more forgiveness over minor subfloor variation. Those gains are not dramatic on paper, but they are often noticeable in lived experience.
A 6.5mm board can also be a smart choice when the floor needs to carry visual weight. Wider or longer planks often feel more convincing when the board has enough body to support that premium look. If the aim is to achieve a polished finish without moving into the highest price bracket, this is frequently the strongest all-rounder.
There is also a practical installation benefit. Installers often appreciate a board that has a bit more rigidity during laying, especially in larger rooms. That can support a cleaner result when the subfloor is not perfect, even after prep work.
Where 8mm makes the biggest difference
An 8mm SPC floor is usually chosen for comfort, acoustic control, and a more substantial feel. Step onto it, and the difference is often clear. The floor tends to feel quieter, denser, and more premium, especially in large rooms where sound can travel.
This thickness is well suited to high-use family homes, upper-level rooms, apartments, and spaces where a stronger sense of solidity is wanted. It can also help when the subfloor is less than ideal, though it should never be treated as a substitute for proper preparation.
In premium renovations, 8mm often earns its place because it changes the experience of the room, not just the specification sheet. The floor can feel calmer and more refined. That matters in main living zones, media rooms, and bedrooms where comfort is part of the design brief.
There are trade-offs, of course. Thicker boards cost more, can affect door clearances, and may create more noticeable transitions to adjoining finishes. In some projects, those small build-up issues matter enough to steer the choice back to 6.5mm.
Thickness is only half the story
A thicker board is not automatically the better board. The wear layer, click system, surface texture, backing, and core quality all matter. If you compare products only by total thickness, you may miss what actually drives long-term performance.
The wear layer deserves close attention in busy homes and commercial settings. This is the protective top layer that resists scratching, scuffing, and general wear. A strong wear layer is often more important than jumping one thickness category.
The attached underlay also changes the picture. Some SPC floors include an acoustic backing, which can improve sound control and walking comfort. A 6.5mm board with a quality attached underlay may feel more refined than a thicker board with a basic construction.
It helps to check a few specifications side by side before making a final decision:
- Wear layer: suited to household traffic or heavier use
- Core density: firm, stable construction
- Surface finish: realistic grain, matte balance, slip resistance
- Backing layer: acoustic support and comfort
- Click system: secure fit and installation reliability
- Warranty terms: clear coverage for residential or commercial use
The subfloor often decides more than the sample board
This is where many flooring choices are won or lost. A beautiful sample in hand tells you very little about how the finished floor will behave over an uneven slab or a timber substrate with movement.
SPC flooring performs best when the base is flat, dry, and stable. Thicker planks can mask small imperfections better than thinner ones, but they do not solve structural or moisture issues. If the subfloor is poor, even an 8mm product can disappoint.
In a renovation, it is wise to ask early questions about floor prep, moisture testing, levelling compounds, and transitions into bathrooms, carpeted rooms, and exterior doors. Those practical details often shape the thickness choice more than aesthetics do.
One room with a difficult threshold can be enough to change the specification across the whole project.
Matching the thickness to the room
Different rooms ask different things of a floor. A spare bedroom and a busy kitchen may sit within the same home, yet they place very different demands on the surface.
If the project covers several spaces, consistency usually looks better than mixing multiple SPC thicknesses. Still, it helps to know where each option tends to shine.
- Bedrooms and studies
- Family living zones
- Hallways and entrances
- Apartments and upper floors
- Budget-focused rentals
A practical rule of thumb works well here:
- 5.7mm: ideal when value and floor height are the key concerns
- 6.5mm: excellent for most homes and most everyday use
- 8mm: best when comfort, sound, and premium feel sit high on the list
Supply depth matters more than people think
The right thickness is easier to choose when you can compare a wide range of colours, finishes, and constructions side by side. That is where a strong supply chain and broad local stockholding become genuinely useful.
In New Zealand, access to a large flooring range can make specification much more efficient, especially for builders, designers, and homeowners managing timelines. FLOORCO, established in Auckland in 2015, sits in a strong position here. With founders drawing on more than 60 years of flooring experience across trade and manufacturing, the business has built a vertically integrated supply structure that reaches from raw material sourcing to production. That setup helps keep costs down while supporting quality control.
The scale of available stock also matters. With more than 1,000 products and around 300,000 square metres of flooring held across leading brands and in-house labels, there is scope to compare SPC options in a meaningful way rather than settling for a narrow shortlist. A broad warehouse inventory also supports prompt supply, which can be critical when a build or renovation schedule is tight.
When buyers can weigh colour, surface finish, attached underlay, wear layer, and thickness in one place, the decision becomes far more precise.
A good choice is rarely about choosing the thickest board on the shelf. It is about choosing the board that fits the room, the subfloor, the traffic, the budget, and the finish level you want. For many homes, 6.5mm will be the best balance. For sharper budgets or tight floor heights, 5.7mm can be spot on. For a more substantial feel and stronger acoustics, 8mm can be well worth it.
Editor: Terry Shi
The founder of FLOORCO with a strong industry background and substantial supply chain resources.
