Laminate flooring is a popular choice for its affordability and aesthetic appeal, but it’s highly susceptible to water damage—especially when exposed to moisture over time. While floods are dramatic and obvious, most laminate damage stems from slow leaks, improper cleaning, or overlooked site conditions. This article explores the common causes, how to prevent damage, and what solutions are available when water strikes.
Common Causes of Water Damage
Water damage to laminate flooring is a common occurrence. The cause of this damage is often such things as a flood, a slow leak from plumbing, or spills. This damage is covered under the manufacturer’s warranty. At other times, water damage may be covered under homeowner’s insurance, and often, most water damage is not covered at all. Depending upon the severity of the damage, it may be correctable by a plank replacement. At other times, a larger portion of, or the entire installation, may need to be replaced.
Slow Leaks and Everyday Spills
Most laminate flooring damage is not caused by catastrophic flooding, but by slow, undetected leaks from plumbing fixtures or appliances. Even minor spills—if not wiped up immediately—can penetrate the core of many laminate products, especially lower-cost Direct Pressure Laminate (DPL) options.
Site Conditions and Maintenance Habits
Improper cleaning methods, such as wet mopping or using devices like the Swiffer Wet Jet, can introduce excess moisture over time. Pet accidents, especially urine, often cause localized swelling between planks. These are considered site-related issues and are rarely covered by manufacturer warranties.
Plumbing and Appliance Leaks
Leaks from dishwashers, water heaters, washing machines, and ice makers can cause buckling and swelling in laminate floors. These leaks often go unnoticed because they occur beneath the surface, allowing moisture to penetrate the core material.
Risk: Unaddressed leaks can compromise flooring and reduce home value.
Detection Tip: Professional inspectors use moisture meters to identify hidden water intrusion.
Flooding and Severe Water Intrusion
Major plumbing failures—such as burst pipes or overflowing toilets—can cause immediate and extensive damage. Buckling, delamination, and mold growth are common outcomes. In these cases, full replacement is often necessary.
Moisture from Concrete Subfloors
Even with a vapor barrier, moisture can migrate from concrete into the back of laminate planks, causing cupping across the entire floor.
Moisture Testing Before Installation
All concrete subfloors should be tested for moisture prior to installation. Newly poured concrete must cure for at least 60 days.
Professional Testing Methods:
- Electronic moisture meters
- Calcium chloride tests – ASTM F 1869
- Relative humidity in concrete floor slabs – ASTM 2170
DIY Moisture Test: Materials:
- 6 mil polyethylene film
- Duct tape
Procedure:
- Tape a 2′ x 2′ section of plastic to clean concrete.
- Leave sealed for 72 hours (longer is better).
- Remove and inspect: if the concrete underneath is dark or damp, the subfloor is too wet for laminate installation.
Maintenance-Related Damage
Improper Cleaning
Repeated wet cleaning can cause swelling at plank edges and joints. This damage often appears as puffy or raised areas and may take months or years to develop.
Pet Accidents
Urine and spills from pets typically cause localized damage. These are considered site-specific and are not product defects.
Sealant Requirements Around Moisture-Prone Areas
Some manufacturers require sealant application around:
- Sliding glass doors
- Kitchen cabinets
- Water heaters
- Other moisture-prone fixtures
Important Notes:
- Use only manufacturer-approved sealants.
- Apply thoroughly to avoid gaps.
- Failure to follow sealant guidelines may void the product warranty.
Some manufacturers require sealant application around:
- Sliding glass doors
- Kitchen cabinets
- Water heaters
- Other moisture-prone fixtures
Important Notes:
- Use only manufacturer-approved sealants.
- Apply thoroughly to avoid gaps.
- Failure to follow sealant guidelines may void the product warranty.
Repair vs. Replacement
Depending on the extent of damage:
- Minor Damage: May be resolved by replacing individual planks.
- Severe Damage: May require partial or full floor replacement.
Coverage varies:
- Manufacturer Warranty: Rarely covers water damage unless explicitly stated.
- Homeowner’s Insurance: May cover damage from sudden leaks or appliance failures.
- No Coverage: Gradual leaks and maintenance-related issues are typically excluded.
Final Thoughts
Water damage to laminate flooring is preventable with proper site preparation, vigilant maintenance, and early leak detection. Whether you’re a homeowner, installer, or inspector, understanding the nuances of moisture-related damage can help protect your investment and avoid costly repairs.
Need Help? Get an Expert Laminate Flooring Inspection
Avoid costly mistakes in choosing and installing laminate flooring. If your flooring has experienced failure, TW Group Flooring Inspection can help with inspections and consultations. Contact 800.621.3427 or submit an online inspection request.
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