WPC decking vs WPC flooring: same initials, different products
Search for "WPC" and you find two unrelated product families: composite deck boards and fences for the yard, and waterproof vinyl planks for the kitchen. They share three letters, not a material, an installation method or a warranty.
Updated
| WPC decking and outdoor products | WPC flooring (vinyl plank) | |
|---|---|---|
| Where it goes | Outdoors: decks, docks, fences, benches, cladding | Indoors: kitchens, basements, living areas |
| Core | Wood fiber blended with polyethylene, polypropylene or PVC, extruded into boards | Foamed PVC with fillers |
| Wood content | Varies by brand; listed on the spec sheet | Often little or none, despite the name |
| Top surface | The board itself, or a polymer cap on capped boards | Printed design layer under a clear wear layer |
| Installed over | Joists on a framed structure, with clips or face screws | A flat subfloor, floating on click joints |
| Built for | Sun, rain, and freeze and thaw cycles | Climate-controlled rooms and topical water |
| Contains PVC | Depends on the polymer; check the spec sheet | Yes |
Why the same three letters mean two things
WPC stands for wood plastic composite. The term started with outdoor building products: wood fiber or wood flour mixed with plastic, heated and extruded into boards that do not rot and do not need staining. Deck boards, fence boards, railings, benches and wall cladding are all made this way.
Flooring manufacturers later used the same initials for a type of luxury vinyl plank with a foamed, waterproof core. Early versions included wood flour in the core. Many current ones contain little or no wood, and you will also see the initials expanded as "waterproof plastic composite" or "wood polymer composite." The name stayed while the material changed. Our guide to WPC vs SPC vs PVC-free flooring covers how WPC flooring compares with the other waterproof cores.
WPC decking: what to know about composite boards
Capped or uncapped. First-generation composite boards exposed the wood and plastic blend at the surface, where the wood fibers could absorb water, fade and hold mold or mildew. Most current boards are capped: a polymer shell is co-extruded around the core to resist staining and fading. On any board, mold and mildew feed on the dirt and pollen that collect on the surface, so regular cleaning with a cleaner the manufacturer approves does more than any additive.
Solid or hollow profiles. Solid boards are heavier and stiffer. Hollow boards, with channels running their length, are lighter and use less material, but their open ends need caps or fascia. Which one suits a deck depends on the manufacturer's span and load tables, not on the profile alone.
Movement with temperature. Composite boards expand and contract along their length as the temperature changes, far more than wood does in that direction. Manufacturers set the gaps at board ends and butt joints according to the temperature on install day, so follow the installation guide for the exact product.
Heat in the sun. Composite and PVC decking can get hot in direct sun, and darker colors run hotter. On an unshaded deck through a DC-area summer, a lighter color or planned shade makes the deck usable in the afternoon.
Recycled content. Some decking brands report high recycled content in their wood fiber and plastic. Treat it like any environmental claim: look for the manufacturer's stated percentage and whether it is pre-consumer or post-consumer, rather than a general "eco" label.
Fences, benches and other outdoor WPC products
The same extruded material is made into fence boards and posts, garden benches, planter boxes, pergolas and wall cladding. The same points apply: capped surfaces resist staining, the material moves with temperature, and structural parts such as fence posts and pergola beams often rely on an aluminum or steel insert or a separate frame. Spans and fastening come from the manufacturer's installation guide.
WPC flooring: waterproof vinyl for inside the house
WPC flooring is a rigid-core vinyl plank. Its foamed PVC core makes it waterproof and gives it a softer, quieter feel than stone-core SPC. The planks click together and float over the subfloor. It is made for climate-controlled rooms: kitchens, mudrooms, living areas and basements whose slab passes a moisture test. The WPC floor we feature is COREtec CR504 Retro Revival, which is GREENGUARD Gold certified and has a cork underlayment attached. It sits alongside PVC-free cork and linoleum in our green waterproof flooring category.
Can one go where the other belongs?
WPC flooring outdoors: no. Vinyl plank is not built for sun, rain, or freeze and thaw, and manufacturers generally warrant it for interior installation only. A screened porch or unheated sunroom sits in between. Manufacturers set limits on temperature and direct sun, so check the installation guide of the specific product before choosing it for one of those rooms.
Decking indoors: composite deck boards are designed to span joists outdoors, not to float over a subfloor, and they are thicker and heavier than flooring. For an indoor floor that handles water, choose a waterproof floor made for interiors.
If the goal is avoiding PVC: WPC flooring always contains it. Wicanders WISE Cork Inspire and Marmoleum Cinch Loc Seal are waterproof-rated alternatives made without PVC.
What we do and do not install
WPC Green Floor sells and installs indoor flooring in Washington, DC, Montgomery County, Maryland and Northern Virginia. We do not build decks, fences or outdoor furniture; for those, a licensed deck or fence contractor is the right call. If you are finishing the inside of the house, including a basement or a sunroom off the deck, see waterproof flooring installation or get an installed price.
If an older link about composite decking or outdoor furniture brought you here: this website now belongs to WPC Green Floor, and the previous site's outdoor product catalog is no longer online.
Common questions
Is WPC flooring the same as composite decking?
No. Both are called wood plastic composite, but composite decking is an extruded outdoor board made of wood fiber and plastic, while WPC flooring is an indoor vinyl plank with a foamed PVC core that often contains little or no wood.
Can WPC vinyl flooring go on a covered porch or in a sunroom?
Only where the manufacturer allows it. Most rate WPC vinyl for climate-controlled interiors and set limits for temperature and direct sun. Check the installation guide for the specific product, or ask us before you order.
Does composite decking contain PVC?
Some does. Many composite deck boards combine wood fiber with polyethylene or polypropylene, some use PVC, and cellular PVC decking contains no wood at all. The manufacturer spec sheet names the polymer.
Does WPC Green Floor build composite decks or fences?
No. We sell and install indoor flooring in Washington DC, Montgomery County, Maryland and Northern Virginia. For decks and fences, contact a licensed deck or fence contractor.