Laminate Floor Water Damage: Warranty Hours, Dry or Replace

What you are looking at: swell, peaking or cupping

Swollen laminate shows itself at the seams first. Name the shape before deciding anything: the NALFA glossary of the North American Laminate Flooring Association defines each one.

What you see	NALFA term and definition	Common look-alike	What it usually points to
Raised ridge along a seam, both boards up	Peaking: seams risen above the horizontal plane from installation or environmental effects	An installation cause, which the definition also names	Water at the joint or an expansion problem; check for wet underlayment
Board edges higher than the centre	Cupping: concave shape, ‘end-lift or horns up’	Crowning, its mirror image	Moisture from below; Shaw names lift from vapour pressure underneath
Centre higher than the edges	Crowning: convex shape, ‘horns down’	Cupping seen against the light	Record which shape it is before drying changes it
Rough, puffy edge with a lip you can feel	Thickness swell, the LF-01 test property	A chipped or worn bevel	Core has absorbed water at the edge
Surface layer bubbling or separating	Delaminating: separation of the layers	A film left by a cleaner	Layer bond lost; board is finished

Run a hand across each seam. Thickness swell is the property LF-01 measures at the edge, so a lip you can feel is the core; a mark you can only see, with tight flat seams, is a surface question.

Why laminate swells: the HDF core and its edges

NALFA describes laminate as a wear layer and décor layer pressed over a wood-based core, with a backing layer typically of melamine. Its standards define high density fiberboard (HDF) as fibreboard denser than 800 kg/m³ and say the core shall be wood based, such as HDF or MDF. The warranties treat the edge as the weak point: Shaw excludes water that flows over an edge or a cut board, and Mannington requires cut planks in wet areas to be sealed.

The industry test treats swelling as expected, within a limit. Under ANSI/NALFA LF-01-2018 section 3.2, a 150 by 150 mm specimen with its edges trimmed is held 25 mm under water for 24 hours, then measured at the middle of each edge. Wood-composite research has long separated reversible from irreversible swell in fibreboard and particleboard, according to a study in the Forest Products Journal, which is why a dried edge can stay proud of its neighbour.

LF-01 usage level	Max swell, per the standard	Swell on an 8 mm plank	Swell on a 12 mm plank
Residential	under 18%	1.44 mm	2.16 mm
Light commercial	under 16%	1.28 mm	1.92 mm
Commercial	under 16%	1.28 mm	1.92 mm
Heavy commercial	under 12%	0.96 mm	1.44 mm

NALFA also runs an add-on NALFA Surface Swell Test for the assembled joint: 100 mL of dyed water, about 9 mm deep, held in a 4 inch ring sealed over a locked joint for 24 hours, according to NALFA.

Water-resistant versus waterproof, as the paperwork defines them

The labels mean what each warranty says they mean, and the definitions are narrower than the box. NALFA’s own FAQ says laminate is not suitable for areas with excessive moisture such as bathrooms unless the manufacturer specifies it as waterproof.

Label	Definition, per the document	Source
Waterproof	Topical water/moisture ‘will not infiltrate plank seams for a period of up to 72 hours’	STAINMASTER waterproof laminate warranty
Water resistant	Top surface water from normal activities ‘for up to 24 hours, will not damage the structural integrity’	LifeProof laminate warranty
Waterproof	Covers topical moisture ‘as long as the water does not flow over the edge of the surface (edge of the room, cut boards, etc.)’	Shaw Residential Waterproof Laminate warranty
Waterproof system	Resists spills and pet accidents; ‘complete waterproof coverage requires the perimeter of the floor to be sealed’	Pergo Outlast+ warranty
100% waterproof	Retail page: ‘No amount of water, moisture, or spills will harm these floors’	Floor & Decor AquaGuard page

The AquaGuard row is a retail page; we could not obtain its warranty text, so it is not in the table below.

Manufacturer warranties on water, side by side

Brand and document	Water claim	Hours	Water exclusions	Conditions
Pergo Outlast+ warranty, effective 11 March 2024	Resists topical spills and pet accidents; damp or wet mopping	None printed	Flooding, plumbing accidents, leaking appliances, water under the floor, moisture from outside the room	Perimeter sealed per instructions
Pergo WetProtect laminate warranty, effective March 2026	‘No-exclusions’ wet warranty for spills, pet accidents, steam mopping; subfloor covered	None printed	Same list; subfloor only if water came through a properly installed joint	Perimeter sealed
Shaw Residential Waterproof Laminate warranty, undated	Will not swell, cup or crack from cleaning or everyday spills	None printed	Casualty events ‘normally covered by homeowners’ insurance’, standing water, hydrostatic pressure	Water must not flow over an edge
Mannington laminate warranty (Restoration, rev. 21 April 2023)	Not damaged by localized spills ‘removed within a reasonable period of time’	None printed	Storms, floods, excessive plumbing leaks, water trapped beneath	Cut planks in wet areas need SpillShield applicator or silicone
STAINMASTER waterproof laminate warranty, undated	No damage from wet mopping and everyday spills	72	Flooding, leaking appliances, pipe damage, saturation, mold; structure and subfloor	Claim in writing within 30 days
allen + roth water-resistant warranty, item 1944763, undated	Resists mopping and everyday spills	24	Flooding, water left over 24 hours, leaking appliances or pipes, pet urine, water underneath	Moisture test assumed; claim within 30 days
LifeProof laminate warranty, Home Legend, effective 17 March 2021	Top surface water will not damage structural integrity	24	Flooding, standing water, leaks of pipes, appliances, doors or windows, water below	Do not remove flooring before inspection

Across all seven documents, none covers a supply line, a dishwasher or a flood, and several tie coverage to perimeter or edge sealing. Shaw calls its exclusions failures normally covered by homeowners’ insurance; how a policy responds is for its wording, see our page on homeowners insurance and water damage.

What can be dried and what must be replaced

Laminate flooring water damage is judged per board, not per room. EPA advises drying water-damaged areas within 24 to 48 hours to prevent mould growth, and the water source sets the outer limit: grey or black water ends the salvage question for the underlayment, as our page on water categories explains.

Condition	Decision	Why
Surface water only, seams tight, wiped promptly	Dry in place	Within every warranty’s topical window
Water under the floor, boards flat	Lift, dry underneath, reassess the boards	The underlayment holds water against the core and the deck
Cupping, edges dry to the touch	Dry the subfloor, then decide	Cupping points to moisture below; fix the source first
Peaked seams or a lip you can feel	Replace those boards	Edge swell in a composite is partly irreversible
Delamination or bubbling	Replace	Layer bond is gone
Category 2 or 3 water	Replace underlayment; boards case by case	Porous pad holding contaminated water

The method for a floating laminate floor

Laminate is usually a floating, click-locked floor, which changes the generic water-damage sequence. Each step notes why.

Step	What to do	Why this differs from generic advice
1. Stop the source, lift standing water	See water extraction	A floating floor hides water beneath it; surface extraction is only the start
2. Photograph before touching	Every seam, plank label, receipt	LifeProof says removal before inspection voids its warranty
3. Pull trim and check the perimeter	Look for sealant at walls and cut edges	Pergo, Shaw and Mannington tie coverage to the edge
4. Unclick boards back from the nearest wall	Number them as they come up	So each board returns to its own place
5. Remove wet underlayment	Bag foam pads	Pad holds water against the subfloor
6. Dry and measure the deck	Against an unaffected reading	The subfloor finishes the job, not the planks
7. Sort the boards	Flat and tight edges go back; lipped edges go	Swell that survives drying is permanent
8. Reinstall with matching stock	Spare planks first	Warranty replacements come from current lines

Drying equipment and targets are covered on our structural drying page; solid and engineered wood follow a different path on our hardwood floor water damage page.

The underlayment and the subfloor

The pad under laminate decides how long water stays. NALFA’s NALFA LF-03 underlayment standard has two tiers; only Tier 2 carries a water vapour and mould requirement.

Property, per the LF-03 standard	Tier 1	Tier 2	Test method
Thickness	1 mm or more	1 mm or more	ASTM D3575
Water vapour transmission	Not required	3 lbs/1,000 ft² per day or less	ASTM E96 or F1249
Mould growth rating	Not required	9 or higher	ASTM D3273
Sound (IIC and STC)	50 or more	50 or more	ASTM E492, E90

STAINMASTER and allen + roth both make a moisture barrier underlayment a warranty condition on concrete, below grade or in moisture-prone areas. Once the pad is out, the deck is its own problem: see our sibling page on subfloor water damage.

Replacing a few boards versus the whole floor

You can replace just a few pieces of laminate if matching boards exist. The warranties say plainly that the manufacturer will not guarantee a match.

Document	What replacement means	Matching risk
Shaw Residential Waterproof Laminate warranty	‘Current running-line products comparable to the warranted product’	Discontinued décor is swapped
Mannington laminate warranty	‘Only new flooring from the current product range’	Same
allen + roth water-resistant warranty	Original décor if available, else equal or greater value	Different look if discontinued
LifeProof laminate warranty	Another customer-approved design, or a refund	Customer chooses a new design
Pergo WetProtect laminate warranty	Colour and gloss differences from later additions excluded	Even the same line may not match

Spare cartons from the original install are worth more than any warranty remedy, and Pergo recommends keeping excess planks for repairs. Without them, a discontinued line turns a few boards into a whole-floor matching question.

Laminate versus vinyl plank in water

FEMA’s flood-resistance classes are the clearest public comparison. In FEMA Technical Bulletin 2 (2008) Table 2, ‘plastic laminate flooring’ is Class 2, unacceptable below flood elevation: not resistant to clean water damage and unable to survive wetting and drying. Homogeneous vinyl sheets or tiles with chemical-set adhesives are Class 4, acceptable. FEMA’s 2025 edition replaced the 2008 one; we could not open the 2025 table, so treat these rows as the 2008 position.

Material in TB-2 Table 2	Class	FEMA verdict
Plastic laminate flooring	2	Unacceptable
Engineered wood flooring	2	Unacceptable
Wood flooring, solid	1	Unacceptable
Vinyl sheets or tiles, homogeneous, chemical-set adhesive	4	Acceptable
Vinyl sheets or tiles on cork or wood backings	1	Unacceptable

TB-2 lists homogeneous sheet and tile, not rigid-core vinyl plank, so the class does not transfer automatically. FEMA also notes that vinyl tile over a plywood floor loses acceptability, because the tile must be removed to let the plywood dry.

Signs it is bigger than it looks

• Peaking that keeps spreading after the source is off, which suggests water moving under the floor.
• Cupping across a whole room: moisture from below, which Shaw excludes as vapour pressure from underneath.
• A musty odour when boards come up, or staining on the underside of the pad.
• Soft or discoloured subfloor at the lifted area.
• Water that came from a neighbouring room, which Pergo excludes as moisture from outside the room.
• Wet drywall at the baseboard line; see our sibling page on water damage in walls.

For contractors: scope, documentation, line items

• Scope: detach and reset versus remove and replace per board, underlayment removal, trim detach and reset, and the matching question priced separately.
• Documentation: photos of seams before lifting, plank labels or carton codes, the warranty edition, and moisture readings of the deck against an unaffected area.
• Warranty traps: LifeProof voids coverage if flooring is removed before inspection; STAINMASTER and allen + roth want a written claim within 30 days. Tell the owner before demolition.
• What an adjuster asks for: the source and its date, why boards cannot be reset, and evidence that a match is not available when a full-room replacement is proposed.

Questions people actually ask

Can water damage on laminate flooring be repaired?

Partly. Boards that only had surface water and still have tight, flat seams can be dried and kept. Boards with peaked seams, a raised lip at the edge or bubbling layers are replaced, because fibreboard swell is partly irreversible. The underlayment beneath wet boards is usually replaced rather than dried.

Is laminate flooring ruined if it gets wet?

Not if the water stays on top and is wiped up. The warranties read here cover topical water for 24 hours (allen + roth, LifeProof) or 72 hours (STAINMASTER), and Pergo and Shaw cover everyday spills with no hour figure. Water that reaches the edges or runs under the floor is excluded by all of them.

My laminate floor has lifted from water. What can I do?

Stop the water, photograph the seams, then unclick boards from the nearest wall to reach the wet area. Remove wet underlayment and dry the subfloor before judging the boards. Lifting that settles once the deck is dry can be reset; edges that stay raised are replaced.

Can you replace just a few pieces of laminate flooring?

Yes, on a click-locked floating floor, if matching boards exist. Warranties do not promise a match: Shaw and Mannington replace from current product lines, and Pergo excludes colour and gloss differences on later additions. Spare cartons from the original installation are the best match available.

Will water under laminate dry out on its own?

Rarely in time. The underlayment traps water against the subfloor and the core, and EPA advises drying water-damaged materials within 24 to 48 hours to prevent mould. Lifting boards and removing a wet pad is usually what lets the deck dry.

How long does it take for water to damage laminate flooring?

The published windows are 24 to 72 hours for topical water in the warranties read here. According to NALFA, its LF-01 swell test soaks a sample for 24 hours and allows under 18% swell at residential grade, so one day at an edge is enough to measure swelling.

Laminate vs vinyl for water: which is better?

For flood resistance, FEMA’s 2008 bulletin classes plastic laminate flooring as Class 2, unacceptable, and homogeneous vinyl with chemical-set adhesive as Class 4, acceptable. Rigid-core vinyl plank is not listed, so check its own warranty.