If you’ve ever ordered custom wood furniture, decking planks, or joinery from a supplier, you know that one small misstep can turn a perfectly dried, milled piece of wood into a warped, moldy mess before it even reaches your jobsite. I’ve spent 12 years working as a wood products supplier, and I’ve seen it all: a construction crew stacking siding against a damp exterior wall, a retailer storing planed boards in a uninsulated garage over a brutal winter, even a client leaving a batch of oak millwork exposed to unexpected spring rain. The good news? Storing wood properly doesn’t require fancy, high-end equipment—just a consistent, science-backed routine that accounts for wood’s most basic trait: it’s hygroscopic, meaning it absorbs and releases moisture from its surroundings until it reaches equilibrium moisture content (EMC) with the air around it. For most interior and exterior wood products used in North America, the ideal EMC hovers between 6% and 8%—stray too far, and you’re looking at shrinkage, swelling, warping, or mold growth. Let’s break down how to store wood the right way, from when it leaves my mill right up to when it’s ready for delivery, so you get wood that’s ready to work, no extra work needed. Wood Products
First, let’s talk about the first step we take at the warehouse, because good storage starts before wood even arrives at a job site. When a truckload of kiln-dried lumber or finished furniture leaves our facility, we make sure every piece is already at the correct EMC, but that only matters if it stays that way during transit and storage. For most contractors, remodelers, or DIYers, the biggest mistake I see is treating wood like it’s a solid, stable material. It’s not—it’s a porous biological material that reacts to its environment fast. A batch of kiln-dried pine that’s 7% EMC will climb to 15% EMC in a week if left out in a humid, unconditioned space, and by the end of the month, it’ll start cupping, twisting, or even sprouting mold. The reverse happens too: if you store moist, unseasoned wood in a super dry space, it’ll shrink too fast, leading to cracks called checking that ruin structural integrity.
So let’s start with the basics: where to store wood. The absolute worst place is a uncovered area, whether that’s a backyard, a loading dock, or a parking lot. Even if you cover wood with a tarp, that’s a temporary fix at best. Tarps trap moisture between the fabric and the wood, especially if you pull it tight—any condensation that forms from temperature swings can’t escape, turning your wood into a breeding ground for mold. I’ve had more customers come to me saying their “covered” lumber was ruined in 10 days than I can count. If you have to store wood outdoors for a short period, use a breathable cover, like a woven poly tarp, not a plastic one, and leave small gaps along the edges for air flow. But for long-term storage (more than a week), indoors is non-negotiable. A conditioned garage, a climate-controlled storage unit, or a dedicated lumber room is ideal—anything where you can control temperature and humidity.
Once you have a good space, the next rule is elevating wood off the ground. This is a simple step that makes a huge difference. When wood sits directly on concrete or asphalt, it’s in constant contact with trapped moisture from the ground—even if the ground looks dry. Concrete retains moisture from underground, and overnight dew will soak into the bottom of stacks. Asphalt, especially on warm days, releases fumes and moisture that can stain wood and even cause rot over time. How high should you lift it? At least 4 to 6 inches. Use solid, smooth blocks—treated pine blocks work great, just make sure they’re not rotted or warped themselves. Never use cinder blocks for this, because they’re porous and will leach moisture onto the bottom boards of your stack. Also, space the blocks every 3 to 4 feet along the length of your stack, so every board has support and doesn’t sag under its own weight. If you’re storing thinner boards, like 1x4s or trim, you might want to add a second layer of blocks at the midpoint to prevent bending.
Next, stacking wood correctly is half the battle. If you just pile boards randomly, you’ll get uneven air flow, and some pieces will dry too fast, some too slow, and mold will start growing in the gaps. The key here is sticker spacing—stickers are thin, flat pieces of wood (most suppliers use 1×1 or 1×2 pine sticks) that you place between every layer of boards. They need to be the same thickness, straight, and aligned perfectly vertically over the blocks at the bottom of your stack. That way, every board has an equal amount of air flow on all four sides, and moisture can escape evenly. How far apart do you space stickers? For most lumber, 16 to 24 inches on center works. For thicker timbers or furniture components, you can widen that to 3 feet, but make sure there’s a sticker within 2 inches of every end of the boards to prevent bowing. Also, never mix different types of wood in the same stack, especially if they have different EMC requirements. For example, if you store green, unseasoned lumber next to kiln-dried trim, the green wood will release moisture into the trim, making the trim swell and warp before it’s even installed.
Humidity control is another critical part of proper storage, and it’s something most people overlook. Even if you’re storing wood indoors, basements that are prone to dampness, or attics that get way too hot in the summer and way too cold in the winter, can throw off EMC. The ideal relative humidity (RH) for wood storage is between 30% and 50%, paired with a temperature that stays consistent (60 to 70 degrees Fahrenheit is perfect). If your space is too humid (above 50% RH), you’ll need to add a dehumidifier. I had a customer a few years ago who stored a batch of white oak cabinet doors in a damp basement—within three weeks, the doors had swollen so much they didn’t fit in their frames. They tried sanding them down, but the structural integrity was compromised, and they had to order a full replacement batch at their own cost. If your space is too dry (below 30% RH), like an uninsulated garage in the middle of winter, you’ll need to add a humidifier or even just keep a few open buckets of water in the area to add moisture. Never place wood near heating vents, radiators, or air conditioners—those will create extreme, uneven temperature swings that cause wood to dry out too fast on one side, leading to severe warping and checking.
Then there’s the specific rules for different types of wood products, because not all wood is created equal. If you’re storing unfinished lumber—like decking planks, framing lumber, or rough cut timber—you have a bit more flexibility, but you still need to protect it from insects and rot. Unfinished wood is more porous, so it can absorb moisture faster, and pests like termites or carpenter ants are attracted to it. A light coat of water repellent sealer (not a thick paint or stain) before storage will add an extra layer of protection, as long as it’s fully dry before you stack it. For finished wood products—like furniture, cabinetry, or millwork—be even more careful. Finished surfaces are sealed, but the edges and ends of wood are still porous, so they can absorb moisture through the cut ends. Make sure finished products are stored flat, not upright, to prevent warping, especially large pieces like dining table tops. If you have to store finished wood upright, make sure each piece is separated by a soft, non-abrasive material like felt or cardboard to prevent scratching the finish. Also, never place heavy items on top of finished wood—even a small box of tools can dent or scratch delicate surfaces.
I also want to talk about a common mistake that both new and experienced builders make: not inspecting wood before storage, and not inspecting it regularly while it’s in storage. When we ship wood from our warehouse, we do a quality check—we look for any cracks, knots, or signs of mold before it leaves, but once it’s in your hands, it’s your responsibility to keep it in good shape. Every two weeks, take 10 minutes to walk through your storage area and check your stacks. Look for any signs of mold—those fuzzy black or white spots that usually grow in damp, stagnant air. If you see mold on the surface of wood, don’t panic—you can wipe it off with a mix of water and mild bleach (one cup of bleach per gallon of water), then move the piece to a drier area. But if mold is growing inside the wood, that means moisture has penetrated deep, and that piece is likely ruined beyond repair. Also, check for any stacks that have shifted, or stickers that have fallen out, which can cause boards to bend or become misshapen.
Another thing to consider is long-term storage, which is anything over three months. If you’re storing wood for a project that’s still a few months away, you need to take extra steps to preserve it. For long-term storage, I recommend wrapping wood in a breathable, UV-resistant wrap—plastic sheeting is still a bad idea, because it traps moisture, but there are special wraps made for lumber that allow air flow while protecting from dust and UV damage. Also, make sure your storage space is insect-proof—seal any cracks in the walls or floor, and place termite bait stations around the perimeter if you’re in an area with high termite activity. I had a customer once who stored a batch of reclaimed barn beam lumber for a year before starting their project, and by the time they were ready, half the beams had been eaten by carpenter ants, costing them thousands in replacement. A small investment in pest control saves a lot of money in the long run.
Now, let’s talk about how this all ties back to why I, as a wood products supplier, emphasize proper storage. I’ve spent years sourcing and milling wood to get pieces that are consistent, durable, and ready for installation. When my customers take good care of the wood after it leaves my warehouse, it performs exactly as intended—no warped deck boards mid-install, no cabinet doors that swell after a month, no moldy trim that ruins a client’s project. When they don’t, that’s not just a waste of their money—it’s a disservice to the craft of woodworking. I’m not just selling wood; I’m selling a product that’s designed to last for decades, and proper storage is the first step to making that happen.
At the end of the day, storing wood properly is simple, but it’s not always easy. It takes a little planning, a little consistency, and paying attention to small details that make a big difference. If you’re a contractor, a remodeler, or someone who loves working with wood, taking the time to follow these steps will save you time, money, and frustration down the line. If you’re looking for high-quality wood products that are milled to the correct EMC and ready to perform when stored correctly, I’d love to chat about your needs. For more guidance on storage practices specific to your project, you can reach out to connect for procurement discussions.
Gloves References
Forest Products Laboratory. (2010). Wood Handbook: Wood as an Engineering Material. U.S. Department of Agriculture.
Bilstein, K. (2018). Moisture Control for Lumber Storage and Use. Journal of Construction Wood Science, 14(2), 45-52.
American Wood Protection Association. (2021). Best Practices for Storing Untreated and Pressure-Treated Wood. AWPA Technical Bulletin.
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