Every LVP plank has the same basic layers: a wear layer on top, a printed design layer, the core, and typically a backing pad on the bottom. The wear layer determines how well the floor resists scratches and dents. The design layer is just aesthetics. The backing pad affects sound and comfort.

The core, though — the core is what determines dimensional stability, moisture handling, and how long the floor stays flat over decades. And there are only two cores worth considering in 2024: SPC and WPC. Everything else (flexible LVP, glue-down sheet vinyl) is a different category entirely.

SPC uses ground limestone as its primary filler, combined with PVC and stabilizers. The result is a rigid, dense, dimensionally stable core that behaves almost like a hard surface rather than a resilient one.

The two properties that make SPC the right call for most Sioux Falls installations: dimensional stability across temperature swings, and forgiveness of subfloor imperfections. Basement floors here can swing from 55°F in an unheated winter to 78°F in summer, and SPC essentially ignores those temperature changes — it doesn’t expand, contract, or cup. It also bridges small subfloor variations (up to about 1/8″ over 6 feet) better than WPC does, which matters in older homes with less-than-perfect concrete.

The tradeoff is feel. SPC is firmer underfoot than WPC. Some people don’t notice; others prefer WPC’s slight cushion. Neither is objectively better — it’s a comfort preference layered on top of the performance decision.

WPC uses wood flour combined with PVC and a foaming agent that creates thousands of microscopic bubbles in the core. That gives WPC its distinctive softer, warmer feel — genuinely closer to real hardwood underfoot than SPC.

Where WPC wins: main living rooms, kitchens where you stand for hours cooking, upstairs bedrooms in two-story homes (softer sound transmission to floors below), and any room where the comfort of walking barefoot matters. WPC also handles small furniture leg loads with slightly better recovery — SPC can hold subtle depressions from heavy furniture legs; WPC bounces back.

Where WPC loses: below-grade installations with variable moisture, rooms with temperature swings, and any application near heat sources (WPC softens above about 130°F, meaning it’s not ideal directly under south-facing windows in full sun or near a fireplace hearth).

The right answer isn’t universal — it’s per room. Here’s how experienced installers think about it in a typical Sioux Falls home:

Basement (finished): SPC. Temperature swings and slab moisture make SPC’s stability worth the slightly firmer feel.

Main-floor living room, dining room: Either works. If the room is above an unheated crawl space, lean SPC. If it’s above conditioned space, WPC gives you noticeably better comfort.

Kitchen: WPC if you cook often — hours of standing feels different on WPC. SPC if you have kids/pets who drop things frequently, since SPC handles impact better without denting.

Upstairs bedrooms, hallways: WPC. Sound transmission matters, and comfort underfoot in bedrooms is real.

Full bathroom: SPC — better long-term moisture resilience even in a well-ventilated room.

Every quote should specify SPC or WPC by name. If a quote just says “LVP” or “luxury vinyl,” ask which core type — and get the answer in writing on the quote. This isn’t a nuisance question; it’s basic due diligence, and any installer who resists specifying is a red flag.

Also ask for the specific product line and manufacturer. “LVP” is a category, not a product. “12mm SPC, 20-mil wear layer, from [manufacturer]” is a specification. The difference determines everything about how the floor performs over the next 15-20 years.