- "Waterproof" means the plank itself won't swell or fall apart in water.
- It does not mean water can't get through the seams and sit underneath your floor.
- Water trapped under a floor on a wood subfloor can cause rot and mould you can't see until it's bad.
- For bathrooms, laundry and basements, waterproof plank is a great choice. Just don't treat it like a swimming pool liner.
We've pulled up "waterproof" floors that looked perfect on top and had black mould on the plywood underneath. The floor did exactly what it promised: the planks were fine. The house wasn't. Here's what the marketing doesn't spell out.
What "waterproof" actually covers
When a vinyl plank (SPC or WPC) says waterproof, it means the core is plastic-based and doesn't absorb water. You could leave a plank in a bucket for a month and it would come out the same size. That's genuinely great. It means a spilled drink, a pet accident or a leaky dishwasher won't make your floor swell and peak the way old laminate did.
When a laminate says waterproof or water-resistant, it usually means sealed edges and a treated core. It's rated to survive standing water for a set time, often 24 to 72 hours. Check the box. That's a different and more limited promise than vinyl's.
What it doesn't cover
- The seams. Click floors are made of hundreds of joints. Water on the surface finds them and goes underneath.
- The subfloor. If water gets under the floor and sits on plywood or OSB, the wood soaks it up. Floating floors don't let it dry out quickly, because the plank on top stops evaporation.
- Mould and smell. Every warranty we've read excludes mould and damage to anything other than the plank itself.
- Big leaks. A burst pipe or flooded basement is an insurance claim, not a flooring warranty claim. Most of the time the "waterproof" floor still has to come up so everything underneath can dry.
How to actually protect a wet room
- Use the right floor: SPC vinyl or porcelain tile in bathrooms and laundry rooms.
- Seal the edges where it matters. In bathrooms we caulk around the tub, toilet and perimeter with a flexible silicone, as the maker allows. Floating floors still need room to move, so it's a careful balance.
- Get the underlay right. On concrete, a vapour barrier stops moisture coming up from the slab. On wood subfloors, follow the maker's instructions. Sometimes adding plastic on wood traps moisture in the wrong place.
- Fix the source. Toilet wax rings, washing machine hoses, dishwasher lines and window leaks. Water usually comes from the same few places.
- Wipe it up. Waterproof buys you time. It's not a reason to leave puddles.
Waterproof vs water-resistant, decoded
| What it says | What it usually means |
|---|---|
| Waterproof (vinyl, SPC/WPC) | Plank won't swell. Water can still pass through seams. |
| Waterproof / water-resistant laminate | Survives standing water for X hours (read the box: 24, 36, 72…). |
| Water-resistant hardwood | A finish or treatment that buys you time on spills. Still real wood, still not for bathrooms. |
| "100% waterproof system" | Usually means using their specific underlay, sealant and trims. Read what the system includes. |
Where we'd use what
- Bathroom: SPC vinyl or porcelain tile (we coordinate tile through trusted trade partners).
- Laundry: SPC vinyl. Put a drain pan under the washer if you can.
- Basement: SPC vinyl over a tested slab with a vapour barrier. Basement guide here.
- Kitchen: SPC vinyl or water-resistant laminate. Both are fine for normal spills.
- Front entry in a rainy Surrey winter: vinyl, tile or water-resistant laminate, plus a real doormat.
Common questions
Is waterproof flooring really waterproof?
The planks are. The floor as a whole isn't sealed: water can get through the seams and onto the subfloor below, where it can cause rot or mould. Waterproof flooring protects the floor, not the house.
Can waterproof vinyl go in a bathroom?
Yes, SPC vinyl plank is a good bathroom floor. Install it with the right gaps, seal around fixtures with flexible caulk where the maker allows, and fix any leaks quickly.
What happens if a waterproof floor floods?
The planks usually survive, but the water underneath needs to dry. Often a section of floor has to come up so the subfloor can be dried and checked for mould. Click vinyl can often be reinstalled if it's handled carefully.
Is waterproof laminate as good as vinyl for water?
No. Water-resistant laminate is rated for a set number of hours of standing water, often 24 to 72. Vinyl's core doesn't absorb water at all. For full bathrooms and flood-prone basements, vinyl or tile is safer.
Who's writing this: Rose and Thorn Flooring is a flooring company in Surrey, BC. We install floors for a living, so yes, we'd love to do yours. But nobody pays us to say nice things about a product, and we don't earn commission from any brand. If something here is wrong or out of date, text us at 604-716-4160 and we'll fix it.