WPC vs. SPC Vinyl: What's the Difference (and Why SPC Won)
Both are rigid core luxury vinyl. Both are waterproof. Both click together and float over almost any subfloor. The difference is one ingredient in the core, and it changes nearly everything about how the floor behaves underfoot and over time.
Here's what actually separates them, where each genuinely wins, and why the industry has consolidated so heavily around one of them.
Quick Answer
WPC (Wood Plastic Composite) has a core of wood flour and plastic polymers, often foamed, which makes it thicker, softer, warmer, and quieter underfoot. SPC (Stone Plastic Composite) replaces the wood content with limestone powder, producing a far denser, thinner, and more rigid core. The trade is straightforward: WPC is more comfortable; SPC is more durable and dimensionally stable - it resists dents dramatically better and barely moves with temperature swings. Both are 100% waterproof. SPC has become the dominant rigid core in the market, and a quality attached underlayment closes most of the comfort gap that once favored WPC.
What's Actually in Each Core
WPC: wood flour plus polymer
WPC cores blend wood flour with PVC and foaming agents. The foaming is the point - it introduces air into the core, which is what makes WPC thicker and softer. That air is also the source of every one of its weaknesses: a foamed core compresses more easily under a point load, and it expands and contracts more with temperature change.
SPC: limestone plus polymer
SPC cores replace the wood flour with finely ground limestone (calcium carbonate) bound in PVC with stabilizers. The result is a dense, solid, non-foamed core - typically thinner than WPC for the same performance, and considerably heavier for its size. That density is what delivers the dent resistance and stability the category is known for.
Side by Side
|
WPC |
SPC |
|
|
Core material |
Wood flour + polymer, foamed |
Limestone powder + polymer, solid |
|
Waterproof |
Yes, 100% |
Yes, 100% |
|
Comfort underfoot |
Softer, warmer |
Firmer - closed substantially by a quality attached pad |
|
Dent resistance |
Lower - a foamed core compresses under point loads |
Substantially higher - dense core resists heavy furniture and heels |
|
Dimensional stability |
Moves more with temperature change |
Very stable - suits sunrooms, vacation homes, wide swings |
|
Thickness for equal performance |
Thicker (typically 5.5-8mm) |
Thinner (typically 4-7mm), easier at transitions and doors |
|
Market availability |
Shrinking - fewer collections each year |
Dominant - the default rigid core |
Why SPC Took Over
A decade ago WPC was the premium rigid core and SPC was the newcomer. The positions reversed for practical reasons, not marketing ones:
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Denting was the deciding failure. The complaint that ended WPC's run was furniture legs, appliance feet, and heels leaving permanent impressions in a foamed core. Dents are visible, permanent, and not repairable in a floating floor.
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Stability matters more than warmth. As vinyl moved into sunrooms, four-season porches, and unconditioned vacation properties, a core that barely reacts to temperature became more valuable than one that felt slightly softer.
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Attached pads erased the comfort gap. Once quality SPC started shipping with bonded underlayment, the sound and comfort advantage that justified WPC largely disappeared - the pad delivers it without the foamed core's fragility.
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Thinner is easier to install. A denser core does the same job in less height, which simplifies door clearances and transitions to adjacent flooring.
A note if you're shopping WPC today: selection has narrowed considerably, and some remaining WPC products are older inventory rather than current designs. Check the manufacture date, the warranty terms, and whether the collection is still in production - a discontinued line means no matching material for future repairs.
Where WPC Still Genuinely Wins
This isn't a one-sided comparison, and the honest cases are worth stating:
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Maximum softness underfoot. If a bedroom or a sewing room's primary requirement is cushioning and you have no concern about heavy furniture, a foamed core does feel softer than a stone core with a thin pad.
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Older, uneven subfloors. A thicker foamed core conforms slightly more forgivingly to minor irregularities - though this is a poor substitute for actually flattening the subfloor, and SPC over a properly prepped floor outperforms it.
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Standing-comfort areas without heavy loads. A laundry room or craft space where you stand for long stretches and nothing heavy sits permanently.
Outside those cases, SPC's advantages compound over a floor's life, while WPC's advantage is felt in the first week and paid for in dents afterward.
Why McMillan builds SPC only: SupremeCORE SPC is engineered around the properties that matter over 25 years - a 2,000+ PSI core at 73 Shore D hardness, 100% waterproof, 22-27 mil commercial-grade wear layer, with an attached antibacterial underlayment delivering IIC 66 / STC 68 acoustics. The comfort argument that once favored WPC is answered by the pad; the durability argument is answered by the core. There was no case for building both.
Frequently Asked Questions
What is the difference between WPC and SPC flooring?
Both are waterproof rigid core luxury vinyl; the difference is the core material. WPC (Wood Plastic Composite) uses wood flour and polymer in a foamed core, making it thicker, softer, and warmer underfoot. SPC (Stone Plastic Composite) uses limestone powder in a solid, denser core, making it thinner, far more dent-resistant, and much more dimensionally stable under temperature change.
Is SPC better than WPC?
For most applications, yes. SPC resists dents dramatically better because its core doesn't compress the way a foamed WPC core does, and it stays dimensionally stable in sunrooms, vacation homes, and spaces with wide temperature swings. WPC's advantage is softness underfoot, but a quality attached underlayment on SPC closes most of that gap - which is a large part of why the market moved decisively toward SPC.
Is WPC flooring being discontinued?
It isn't universally discontinued, but availability has narrowed substantially as manufacturers consolidated around SPC. Fewer new collections launch each year, and some WPC on the market is older inventory. If you're considering WPC, confirm the line is still in production - a discontinued collection means no matching material if a plank ever needs replacing.
Which is better for dents, WPC or SPC?
SPC, by a wide margin. WPC cores are foamed, meaning they contain air, and air compresses under concentrated pressure from furniture legs, appliance feet, and heels. SPC's solid limestone-and-polymer core resists that compression. Since dents in a floating floor are permanent and not repairable, this difference is the single strongest practical argument for SPC.
The Bottom Line
WPC trades durability for comfort; SPC trades a little comfort for durability, then buys the comfort back with an attached pad. That's the whole comparison. Both are waterproof, both float, both look the same from standing height - but one of them still looks the same after ten years of furniture, and that's the one the market chose.
