{"id":613,"date":"2026-10-21T14:09:14","date_gmt":"2026-10-21T06:09:14","guid":{"rendered":"http:\/\/www.bjltmj.com\/blog\/?p=613"},"modified":"2026-10-21T14:09:14","modified_gmt":"2026-10-21T06:09:14","slug":"what-is-the-moisture-resistance-of-plank-flooring-4e3b-a702e6","status":"publish","type":"post","link":"http:\/\/www.bjltmj.com\/blog\/2026\/10\/21\/what-is-the-moisture-resistance-of-plank-flooring-4e3b-a702e6\/","title":{"rendered":"What is the moisture resistance of plank flooring?"},"content":{"rendered":"

Hey everyone, Sarah here from your go-to plank flooring supplier \u2013 the one you actually wanna talk to when your home\u2019s flooring questions start piling up. Lately, I\u2019ve been fielding so many calls and DMs about moisture resistance in plank flooring that I figured I\u2019d turn this into a real talk blog post. No stuffy textbooks, no confusing jargon, just what you actually need to know if you\u2019re browsing new floors or ready to place an order with us. Let\u2019s cut to the chase: moisture is the #1 enemy of plank flooring \u2013 but that doesn\u2019t mean all planks are created equal when it comes to fighting it. Let\u2019s break this down like we\u2019re sipping coffee on a Saturday, yeah? Plank Flooring<\/a><\/p>\n

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First off, let\u2019s get one super common myth out of the way. A lot of people think all wood floors warp, period \u2013 but that\u2019s just not true, especially with how plank flooring has evolved in the last decade. Wait, hold on \u2013 I said \u201cplank,\u201d not the flimsy thin laminate stuff you put in a rental and regret. When I talk about plank flooring, I\u2019m talking about solid wood planks (our premium solid oak and ash lines, fyi) and engineered wood planks, which is what most of our customers go for in high-moisture areas like basements or bathrooms. Let\u2019s start with how moisture even messes with wood, because this is key to understanding why some planks handle it better.<\/p>\n

Wood is a hygroscopic material, right? It sucks moisture in when the air around it is damp, and releases it when it\u2019s dry. That\u2019s why you see old attic wood warp, or why your kitchen floor creaks when it rains super hard \u2013 the wood swells and shrinks with humidity changes. Solid wood planks are especially prone because they\u2019re one single piece of wood from top to bottom. So if you put solid wood in a basement where humidity jumps to 60% in the summer (which is way higher than the ideal 30-50% for indoor wood flooring), that plank\u2019s gonna soak up that moisture, swell, and could even cup (that\u2019s when the edges get higher than the middle, gross) or crack later. But engineered wood planks? That\u2019s a whole different story.<\/p>\n

Engineered plank flooring is made of a thin \u201cwear layer\u201d of real wood on top, glued to multiple layers of high-density plywood or HDF (high-density fiberboard) underneath. The cross-direction layers are the game-changer here \u2013 they keep the whole plank from moving as much with humidity changes. We tested our engineered oak planks last year in a customer\u2019s unfinished basement that hit 58% humidity in July, and guess what? No cupping, no warping, zero issues after a full year. That\u2019s the kind of real-world test I care about, not just the lab numbers that sound good on a website. But wait \u2013 I can\u2019t talk about moisture resistance without mentioning the installation part, because that\u2019s half the battle. Even the most moisture-resistant planks will fail if you install \u2019em wrong.<\/p>\n

Let\u2019s talk about subfloors, because this is where so many of our first-time customers slip up. If you\u2019re putting planks over a concrete subfloor (super common in basements and ground-floor additions), you need a proper vapor barrier. A lot of cheap vapor barriers tear during installation, or people skip it entirely \u201cto save time\u201d \u2013 that\u2019s a recipe for disaster. The moisture from the concrete can seep up, get trapped between the subfloor and your planks, and cause all sorts of damage. For solid wood planks, we always recommend a vapor barrier rated for at least 15 pounds per 1000 square feet, and making sure the subfloor\u2019s moisture content is under 12% before you even bring the planks in. For engineered planks, it\u2019s a little more flexible \u2013 we can go up to 14% subfloor moisture, but we still push for that barrier because it\u2019s an extra layer of protection.<\/p>\n

Now, let\u2019s get to the different types of plank flooring and their actual moisture resistance scores, because I know you\u2019re here for the real deets. Let\u2019s start with solid wood, since that\u2019s what a lot of people want for its natural look. Our solid white oak planks have a Janka hardness rating of 1360, which means they\u2019re pretty durable, but their moisture resistance is dependent on the species too. Teak solid planks are way more moisture-resistant than pine, for example \u2013 teak has natural oils that repel water, which is why you see it used for outdoor furniture. But even teak solid wood planks aren\u2019t meant for bathrooms or direct contact with water. If you spill a glass of water on solid planks, wipe it up within 15 minutes and you\u2019re fine \u2013 but leaving a puddle overnight? That\u2019s a no-go.<\/p>\n

Then there\u2019s our engineered plank line, which is the workhorse of our inventory. The core is made of multiple layers of wood pressed under high pressure, so it\u2019s way more stable than solid. Our engineered maple planks can handle up to 12% relative humidity in the space, which is perfect for most standard homes (living rooms, bedrooms, even some mudrooms). We also have a waterproof engineered line, which is 100% waterproof \u2013 that\u2019s the one we recommend for bathrooms, laundry rooms, and basements. The core is actually high-density plastic with a thin wood wear layer on top, so it doesn\u2019t absorb any moisture at all. I had a customer last month who put this in her full bathroom after her old laminate warped in a year, and she sent me a pic six months later \u2013 not a single bubble, not a single mark. That\u2019s the stuff that makes my job worth it.<\/p>\n

Wait, I should also mention luxury vinyl plank (LVP) even though technically it\u2019s not real wood \u2013 but a lot of our customers ask about it, so it\u2019s worth covering. LVP is 100% waterproof, obviously, since it\u2019s vinyl, but it doesn\u2019t have the natural wood feel or the durability that our real wood planks have. It\u2019s great for basements or powder rooms, but if you want that warm, natural plank look, our engineered or solid lines are the way to go for moisture resistance.<\/p>\n

Now, let\u2019s talk about common mistakes people make when assessing plank flooring moisture resistance. First, thinking all \u201cwater-resistant\u201d planks are the same. LVP is waterproof, but a water-resistant engineered plank? That means it can handle minor spills and humidity, not being submerged. We make that distinction super clear on our product pages, but I still get calls from people who bought a cheap \u201cwater-resistant\u201d plank from a big box store and flooded their basement last winter because they thought it could handle standing water. Second, not acclimating planks before installation. That\u2019s when you leave the planks in the room you\u2019re installing them in for 3-7 days so they adjust to the space\u2019s humidity and temperature. If you bring dry planks from a storage unit and put them in a super humid living room, they\u2019ll swell once installed, which can cause buckling. We always remind customers of this, and if you buy from us, our installation guides walk you through it step by step \u2013 no weird fine print.<\/p>\n

Another thing I get asked all the time: can I use solid wood planks in a high-moisture area? Short answer: only if you\u2019re prepared for some movement. We had a customer a few years ago who put solid white oak planks in his \u00bd bathroom, and while he wiped up every spill immediately, the humidity from his shower made the planks swell just enough to raise the baseboards a little. He ended up sanding them down, but he loved the look so much he didn\u2019t regret it. But if you want zero maintenance and zero movement, go engineered or our waterproof line.<\/p>\n

Let\u2019s also touch on humidity levels, because that\u2019s the big one that most people overlook. Your home\u2019s indoor humidity fluctuates depending on the season \u2013 in the winter, your furnace dries out the air, which makes wood planks shrink and gap at the seams. In the summer, AC or humidity from outside makes them swell. The sweet spot for all our plank flooring is 30-50% humidity, year-round. If you have a basement that\u2019s always over 55% in the summer, a dehumidifier is non-negotiable \u2013 that\u2019s how you extend the life of your planks, not just the plank\u2019s moisture rating. I swear by the ones from XYZ (wait no, don\u2019t link \u2013 just ask me for recs) that run quietly and don\u2019t take up a ton of space.<\/p>\n

Now, let\u2019s get to the part you\u2019ve been waiting for: how to pick the right plank flooring for your moisture needs. Let\u2019s break it down by room:<\/p>\n