What is inside each core
Every rigid vinyl plank is built the same way from the top down: a clear wear layer, a printed wood or stone image, then a core, sometimes with a pad attached underneath. SPC and WPC differ only in that core.
SPC stands for stone plastic composite. Its core is a blend of limestone powder, PVC and stabilizers, pressed dense and hard. WPC stands for wood plastic composite. Its core is foamed, made from a blend of wood pulp and plastic, so it has some give. Because SPC is so dense, makers can build it thinner. In one national line, SPC runs 5 to 9 mm thick and WPC runs 12 mm.
Both cores are sold as waterproof. Water spilled on top won't swell either one the way it swells a wood-fiber laminate core.
SPC and WPC side by side
Here is how the two cores compare, using the makers' own descriptions and install guides. Numbers vary by product line, so read the guide for the exact plank you are buying.
| SPC (stone plastic composite) | WPC (wood plastic composite) | |
|---|---|---|
| Core | Limestone powder, PVC, stabilizers. Dense and hard. | Foamed wood pulp and plastic. Softer. |
| Feel underfoot | Firmer | Softer, warmer, closer to wood |
| Dents from furniture and drops | Resists them better | More likely to mark |
| Sound | Less sound absorption | Better sound absorption |
| Temperature swings | Handles them better | Slightly more sensitive |
| One maker's three-season allowance (floating only) | -25°F to 155°F | 32°F to 100°F |
| Typical cost | Generally lower | Generally slightly higher |
Heat is the Florida tiebreaker
A Florida floor lives through hot afternoons at the sliding door, closed-up summers and the odd AC failure. That is where the two cores separate.
One major maker publishes install guides for both its SPC line and its WPC line. Both say to install in a climate-controlled space between 55°F and 85°F. Both allow a wider range after installation for rooms that go without climate control for part of the year. For the SPC line, that allowance is -25°F to 155°F. For the WPC line, it is 32°F to 100°F. In both guides the wider range applies to floating installs only, not glue-down.
That is one maker's pair of products, not a law of nature. Still, it matches the general description of the two: SPC handles big temperature changes better, and WPC is somewhat more sensitive to them. If your home has a lot of west-facing glass or sits empty in summer, SPC gives you more margin.
Neither core is immune to the sun. Both of those guides warn that prolonged direct sunlight can discolor the floor and that heat from the sun causes expansion. Both recommend drapes or blinds during peak sun.
Dents, comfort and the slab underneath
Most Florida homes sit on a concrete slab, and concrete is hard. The foamed WPC core softens that. It feels warmer and more forgiving on your feet, and a cork-backed WPC can hide minor bumps in the subfloor. That is a real advantage if you stand in the kitchen for hours or have sore knees.
The trade is dents. A foamed core compresses. A dense SPC core does not, so a dropped pan, a piano leg or a recliner that gets moved around is less likely to leave a mark. For homes with heavy furniture, big dogs or a lot of traffic, that matters more than a little softness.
Neither core fixes a bad slab. Rigid core install guides still call for leveling any dip or hump greater than 3/16 inch in 10 feet. A softer core can mask small flaws, but it won't bridge a real low spot.
Water from above and from below
Waterproof describes the plank's reaction to a spill on top. It doesn't stop moisture rising out of the concrete. For floating installs on concrete, the SPC guide above recommends a 6-mil poly film underlayment with taped seams, and it puts moisture testing on the installer before work starts. That applies to SPC and WPC alike.
Flooding is a separate question. FEMA's Technical Bulletin 2 rates homogeneous vinyl sheets or tiles set with chemical-set adhesives on concrete as acceptable flood damage-resistant flooring. It does not give that rating to floating click floors of either core type. It also lists vinyl coated on cork or wood-product backings as unacceptable.
What we install and why
Waterline Floors installs SPC core plank. On a Florida slab, the dent resistance and heat tolerance matter more to most homeowners than the extra cushion of WPC. We pair it with a wear layer of 6, 12 or 20 mil, and a 20-mil wear layer over SPC lasts 20+ years.
If comfort or sound is your main concern, say so at the measurement. An attached pad or a separate underlayment approved by the maker can soften an SPC floor and quiet footsteps without giving up the dense core. You can see how the whole job runs on our waterproof flooring installation page.
Questions People Ask
Is SPC or WPC better for a Florida home on a slab?
For most slab homes, SPC. Its dense limestone and PVC core resists dents better, and it generally tolerates temperature swings better than a foamed WPC core. In one maker's guides, the SPC line allows -25°F to 155°F in three-season rooms while the WPC line allows 32°F to 100°F. WPC wins on softness and quiet.
Are both SPC and WPC waterproof?
Both are sold as waterproof, meaning a spill on top won't swell the core. That doesn't cover water vapor rising from the slab, which is why guides call for a 6-mil poly barrier under floating floors on concrete. It also doesn't make either one flood-rated. FEMA gives that rating to glue-down vinyl on concrete, not floating click floors.
Does WPC feel softer than SPC?
Yes. WPC has a foamed core made from wood pulp and plastic, so it has some give and feels warmer underfoot. SPC is firmer because its core is dense and mineral-filled. You can soften an SPC floor with an attached pad or a maker-approved underlayment.
Which dents more easily, SPC or WPC?
WPC. A foamed core compresses under point loads like furniture legs, dropped pots and appliance feet. SPC's dense core resists those marks better, which is why it's the usual pick for kitchens, heavy furniture and busy households.
Is SPC louder than WPC?
SPC absorbs less sound than WPC, so footsteps can sound a bit sharper. An attached acoustic pad or a separate underlayment approved by the maker helps. In a condo, the building's sound rules decide the underlayment, not the core type alone.
Can either core go in a sunroom?
Some can, but only the specific products whose guides allow it, and usually only as a floating install. Both SPC and WPC guides warn that prolonged direct sun can discolor the floor and cause expansion, and recommend drapes or blinds during peak sun.
Sources
- COREtec Pro residential installation guidelines for SPC products: https://pdmsview.shawinc.com/USFloors/COREtec-Pro/Installation/Residential-Installation-Guidelines-for-SPC-Produc
- COREtec Originals installation guidelines for WPC products: https://www.georgiacarpet.com/pages/coretec-installation-guides/coretec-originals-installation-guide.html
- Johnson Hardwood, SPC vs WPC flooring: https://johnsonhardwood.com/spc-vs-wpc-flooring/
- MSI, should I choose SPC or WPC: https://www.msisurfaces.com/blogs/post/2025/11/25/should-i-choose-spc-or-wpc-for-my-project.aspx
- Mohawk SolidTech installation guidelines (rev. Oct 2018): https://mohawk.blob.core.windows.net/mohawkflooring/pdf/install/SolidTech_Installation.pdf
- FEMA Technical Bulletin 2, Flood Damage-Resistant Materials Requirements (2025): https://www.fema.gov/sites/default/files/documents/fema_tb_2_flood_damage-resistant_materials_requirements_01-22-2025.pdf