Water Damaged Floor Restoration: What Dries, What Gets Replaced

Three things decide the outcome for every floor type on this page, and none of them is how the floor looks right now.

The water category matters first. Clean supply-line water (Category 1) gives the widest window to dry a floor in place. Sewer backup, sump overflow, and any water that has sat and started to smell (Category 2 or 3) force a harder line, because the standard is contamination, not just wetness, and contaminated material inside a floor assembly is generally removed rather than cleaned.

How long the water sat matters just as much. A floor extracted within hours has options a floor that sat for three days does not, because standing time is what lets clean water degrade and what lets any wet material start to support mold growth, which the EPA states can begin in 24 to 48 hours on a wet surface.

What is underneath the visible floor matters more than the visible floor itself. A floor over a slab behaves differently from the same floor over a wood subfloor with a void underneath, because a void that holds standing water keeps feeding moisture up into whatever sits on top of it until the void itself is dried.

The vinyl wear layer usually is water resistant, and that is a real, different starting point from laminate's fiberboard core. A sealed, intact vinyl plank does not swell the way a laminate core does.

The catch is the seam and the void underneath it, not the plank material. LVP is installed as a floating floor over foam underlayment, click-locked at every edge, or glued down over the subfloor directly. Either way, water finds the seam between planks before it finds a way through the vinyl itself, and once it is under a floating floor, it sits against the subfloor with no path out, which is the condition that eventually degrades the water category and the subfloor underneath.

That is why LVP marketed as waterproof still comes up after a Category 2 or 3 loss. The plank itself may be fine. The subfloor and the underlayment under it are not something the vinyl protects, and once contaminated water is in that void, the standard calls for opening it, not trusting the finish floor's water rating to mean the job underneath it is done.

Usually not the tile itself. Ceramic and porcelain tile are fired, non-porous or close to it, and do not absorb water the way wood, laminate, or carpet do. Grout is the softer spot: it is porous, and in a Category 2 or 3 loss, standing contaminated water in grout lines is a real contamination risk the tile surface alone is not.

The real question on a tiled floor is the same one that governs every floor on this page: what is underneath it. Tile over a wood subfloor can trap water in the void beneath the mortar bed and the backer board, feeding moisture up through the grout lines long after the surface looks dry, in exactly the way a laminate or LVP floor traps water under a floating installation. Tile over a slab behaves differently again, closer to the slab case below.

Prime checks moisture at the grout lines and, where access allows, at the subfloor or slab underneath, rather than treating a tile floor as automatically fine because the surface material itself does not absorb water.

Yes, and it is the part of the job that is invisible from the room above. A wood subfloor is almost always plywood or oriented strand board (OSB), and the two swell differently when wet.

NRCA's trade publication, citing APA swell-test data, reports half-inch plywood averaging 9.4% thickness swell from oven-dry to a full vacuum soak, against 32.9% for 7/16-inch OSB, about 3.5 times greater. OSB also swells unevenly at panel edges and seams, and that swelling does not fully reverse once the panel dries. Plywood tends to swell more evenly and recover closer to its original thickness.

The practical effect: an OSB subfloor that got wet and dried can still telegraph a ridge or a soft seam up through a floating laminate or LVP floor laid on top of it, weeks after a moisture meter reads the room dry. Prime checks the subfloor panel itself, where access allows, rather than assuming a dry reading on the finish floor means the subfloor underneath is sound.

No table replaces a moisture reading taken in your home. This is the general pattern Prime sees, not a guarantee for any specific floor.

A homeowners policy commonly covers sudden and accidental water damage. The carrier decides, based on the facts of the loss and the specific policy in force.

Matching is its own, separate question from coverage: whether undamaged flooring in an adjoining, unaffected room or an unaffected section of the same room has to be replaced so the new material matches what is left. It is one of the most common disputes in a flooring claim and one of the least understood, and it is policy and fact specific. The carrier decides whether matching applies to your loss, not Prime and not a general rule stated here.

Prime documents the water category, the affected area, and moisture readings in every room the water reached, including whether the damage stopped at a doorway or continued under it, because that record is what a carrier and, where it applies, a matching decision work from either way.