If your hardwood floors started looking wavy after last summer, you're not imagining it. Cary's humid summers, with dew points often sitting in the 70s and afternoon thunderstorms that dump an inch of rain in an hour, are brutal on flooring. We see the aftermath every fall: cupped planks, popped seams, and gaps that weren't there in spring. The damage isn't always obvious at first, but by August, it's hard to ignore. Here's what's happening under your feet and which problems you can fix yourself versus which ones need a professional flooring contractor.
Why Cary's Humid Summers Wreck Your Floors
Wood is a hygroscopic material. That means it constantly absorbs and releases moisture from the air. In Cary, indoor humidity can easily climb above 60% during July and August, especially in homes without central air or with older windows. When wood absorbs that moisture, it expands. When it dries out in the fall, it contracts. That cycle alone causes minor seasonal movement, but a wet summer accelerates it dramatically.
The bigger culprit is water intrusion. Heavy rain, poor grading, a clogged gutter, or a foundation crack can push moisture into your subfloor. If your floors are on a slab or over a crawl space, that moisture wicks upward. The result is a floor that's not just humid, but genuinely wet underneath. This is a different problem than humidity, and it requires a different solution.
Most homeowners don't notice the early warning signs. A slight squeak here, a tiny gap there. By the time you see a plank visibly lifted or buckled, the damage is already done. The key is to catch it early, and that starts with knowing exactly what you're looking at.
Cupping, Crowning & Gapping: How to Spot Each Type of Damage
Three terms get thrown around a lot, but they describe very different problems. Cupping is when the edges of a plank are higher than the center, creating a concave shape like a shallow bowl. This happens when the bottom of the plank absorbs more moisture than the top. It's the most common summer issue, and often the most fixable.
Crowning is the opposite: the center of the plank is higher than the edges. This can happen when cupped floors are sanded prematurely, before the moisture has equalized. It can also occur when the top of the plank gets wet from a spill or a leak that wasn't cleaned up. Crowning is harder to fix because you can't just sand it down without risking the edges.
Gapping is when planks pull apart, leaving visible seams. This usually happens in winter when heat dries the air, but it can also appear in summer if your home's humidity swings wildly. In Cary, we see gapping when homeowners run dehumidifiers aggressively after a humid spell, then shut them off. The rapid change stresses the wood.
Here's a quick checklist to identify what you're dealing with:
- Run your hand across the floor. If you feel a dip in the center of the plank, it's cupping.
- If you feel a hump in the center, it's crowning.
- Check the ends of planks for visible gaps wider than a credit card.
- Look for dark spots or staining near baseboards, which suggest water intrusion.
- Listen for squeaks that appear only in certain areas, especially after rain.
Water Intrusion vs. Humidity: Diagnosing the Real Cause
Before you spend a dime on repairs, you need to know what's causing the problem. Humidity is a whole-house issue. Water intrusion is localized. Here's how to tell the difference.
If your floors are cupping in a broad area, like an entire room or the whole first floor, it's likely humidity. Your indoor RH is probably above 55%, and the wood is absorbing that moisture. You can test this with a cheap hygrometer from a hardware store. If the RH is consistently above 60%, that's your culprit.
If the damage is concentrated near an exterior wall, around a window, or in a corner near a bathroom, suspect water intrusion. Check for dampness in the drywall or a musty smell. Look outside at the grading. In Cary, many homes have flower beds that slope toward the foundation, which is a recipe for trouble.
Another test: place a plastic sheet over a suspected area and tape it down. Leave it for 24 hours. If condensation forms on the underside of the plastic, you have a moisture problem coming from below. If it's dry, the issue is airborne humidity.
Once you know the cause, you can decide whether to call in a pro or handle it yourself. If it's pure humidity and the damage is mild, you might be able to fix it by controlling the indoor climate. But if there's water intrusion, you need to find and fix the source first, or any repair will fail.
Repair vs. Replace: Which Floors Can Be Saved and Which Can't
Not every damaged floor needs to be ripped out. In fact, most cupping resolves on its own if you dry the environment out. The wood will slowly release the moisture and flatten back out, though it can take weeks or even months. During that time, don't sand. Sanding a cupped floor while it's still wet will result in a permanently crowned floor.
Here's a rough guide to what's salvageable:
- Cupping from humidity: Usually fixable. Control the humidity with an AC or dehumidifier, give it time, and it often flattens.
- Cupping from water intrusion: Fixable if caught early and the source is resolved. If the subfloor is saturated, you may need to replace the affected planks.
- Crowning: Harder to fix. If it's from premature sanding, you might be able to sand it down, but you risk the edges. If it's from a leak, the damaged planks need replacing.
- Gapping: Often cosmetic, but if the gaps are wide enough to see the subfloor, you need to address the humidity swings. Wide gaps may require wood filler or plank replacement.
- Buckling (planks lifting off the subfloor): This is the worst case. Buckling usually means the wood swelled so much it detached from the subfloor. That's a replace situation.
If you're unsure, start with the cheap fixes. Run a dehumidifier for a week and see if the cupping subsides. If it doesn't, or if you see signs of mold or rot, it's time to call a professional. Mold is a health risk, and rot compromises your subfloor. That's not a DIY project.
How a Pro Flooring Contractor Fixes Summer Damage for Good
When you've got real damage, a professional flooring contractor like Burns Carpentry will do more than just sand and refinish. The process starts with a diagnosis. We'll test moisture levels in the wood and the subfloor using a pin meter, and we'll check your home's humidity levels. We'll also look for the source of any water intrusion, because we're not going to fix a floor only to have it happen again.
If the subfloor is damaged, we'll replace it. Then we'll acclimate the new hardwood or engineered planks to your home before installation. That's a step many DIYers skip, and it's why their floors fail within a year. For repairs, we'll match the plank width, wood species, and finish as closely as possible. Sometimes we can pull planks from a closet or an inconspicuous area to use as replacements.
We also handle the finishing. Sanding, staining, and sealing correctly is a skill. A poor finish will look blotchy and won't protect the wood from future moisture. We use commercial grade finishes that cure properly and offer better moisture resistance than anything you'll find at a big box store.
Burns Carpentry's Flooring Installation service covers hardwood, laminate, and vinyl. For summer-damaged floors, we often recommend Laminate Flooring or Vinyl Flooring as replacements. Modern laminates and vinyls are highly water resistant, they'll handle Cary's humidity swings without cupping or crowning, and they cost less than real wood. If you love the look of wood but don't want the maintenance, those are solid options.
We're fully licensed and insured in Cary and all of McHenry County, so you're protected if anything goes wrong. Our workmanship is guaranteed for two years. We'll give you a free estimate and a straight answer about whether your floors can be saved or if it's more economical to replace them.
Frequently Asked Questions
How long does a Flooring Installation take in Cary?
Most installations take two to five days, depending on the scope and whether we're also doing subfloor repairs. Your home will be usable during the project, though you may need to avoid the work area. We'll give you a detailed timeline before we start.
Can I fix cupped hardwood floors myself?
Mild cupping from humidity can often be resolved by running a dehumidifier and waiting. But if the cupping is severe or caused by water intrusion, you need a professional. Sanding a cupped floor before it's dry will ruin it.
What's the difference between laminate and Vinyl Flooring?
Laminate has a wood core and is more realistic, but vinyl is completely waterproof. For basements or rooms with high moisture, vinyl is the better choice. For living areas where you want a wood look, laminate is a great option.
Do you offer free estimates?
Yes, we provide free estimates for all flooring projects in the Cary area. We'll come to your home, assess the damage, and give you a written quote. No pressure, just honest advice.
If your floors are showing the effects of a wet summer, don't ignore it. The longer you wait, the more expensive the fix gets. Burns Carpentry can assess the damage, tell you whether a repair or replacement makes sense, and handle the job from start to finish. We serve Cary and the surrounding areas. Give us a call and get your floors back to looking great.
