Checking an lp lvl span chart is pretty much the first thing you need to do before you start framing out a big opening in a house. If you've ever tried to take out a load-bearing wall to create that "open concept" everyone wants, you know that a standard 2x12 just isn't going to cut it most of the time. That's where Laminated Veneer Lumber (LVL) comes in. It's stronger, straighter, and way more predictable than regular old lumber, but you can't just guess which size to use. You need the data.
I've spent plenty of time squinting at these charts on job sites, usually with a cup of lukewarm coffee in one hand and a tape measure in the other. At first glance, those tables full of tiny numbers can look pretty intimidating. But honestly, once you understand what the chart is actually trying to tell you, it's a lot like reading a map. It's all about matching up what your house weighs with how far you need to jump across a room.
Why LP LVL is Different From Standard Wood
Before you even dive into the numbers, it helps to understand why we're looking at an lp lvl span chart instead of just grabbing a piece of Douglas Fir from the local yard. LP SolidStart LVL is an engineered product. They take thin wood veneers, glue them all together with the grain running in the same direction, and heat-press them into huge billets.
This process gets rid of the natural defects like knots or twists that make standard wood unpredictable. If you buy a 1¾-inch by 11⅞-inch LVL, you know exactly how much weight it can handle across a 12-foot span. You can't say the same for a piece of dimensional lumber that might have a massive knot right in the middle of the span, waiting to crack. Because it's so consistent, the "span" (the distance between supports) can be much longer, which is why these beams are the go-to for garage door headers and long floor joists.
Deciphering the Load Requirements
When you open up that lp lvl span chart, the first thing that might trip you up is the terminology regarding "loads." You'll see terms like "Live Load" and "Dead Load."
Think of it this way: the Dead Load is the weight of the house itself. It's the shingles, the plywood, the drywall, and the actual beam. It's not going anywhere. The Live Load is everything that moves or changes. This includes people, furniture, and—if you live somewhere cold—the massive pile of snow sitting on your roof in January.
Most residential floor charts are calculated for a total load of 50 or 60 pounds per square foot (psf), usually split between 40 psf live load and 10 or 20 psf dead load. If you're looking at a roof header chart, those numbers change based on your local climate. You don't want to use a floor span chart for a roof project, or you're going to have a very bad time when the first blizzard hits.
Depth vs. Thickness: What Matters More?
One thing you'll notice quickly on the lp lvl span chart is that increasing the depth of the beam (how tall it is) gives you a much bigger boost in strength than just adding more layers (thickness).
Let's say you have a span that's just a little too long for a double 9½-inch LVL. You might think, "I'll just add a third 9½-inch beam." While that does help, jumping up to a double 11⅞-inch beam is usually way more effective. In the world of engineering, the "moment of inertia" is heavily influenced by height. A taller beam resists bending much better than a wider, shorter one. Whenever I'm planning a header, I always try to go as deep as the wall framing allows before I start adding extra plies (layers) of LVL.
How to Read the Rows and Columns
When you're actually looking at the lp lvl span chart, you'll usually find the beam depths listed down the left-hand side. Across the top, you'll see the clear span—that's the distance between the inside faces of your supports (like the jack studs in a wall).
You find your span, move your finger down to the load requirement for your specific project, and then see which beam size intersects with that data. It sounds simple, but you have to be careful. Some charts show the "Allowable Uniform Load," while others show the "Maximum Span" for a specific beam size. Make sure you're looking at the right version for what you're trying to solve.
Also, pay attention to the "Plies." Most LVLs come in a standard thickness of 1¾ inches. If the chart says "2-1¾" LVL," it means you need to nail two of those beams together to reach the capacity shown in that box. If you only install one, you're only getting half the strength, which is a recipe for a sagging ceiling or worse.
Don't Forget About Deflection
There is a difference between a beam being "strong enough not to break" and "stiff enough not to bounce." This is what we call deflection. On an lp lvl span chart, you'll often see a limit like L/360 or L/240.
L/360 is a common standard for floors. It basically means the beam shouldn't bend more than the length of the span (in inches) divided by 360. If you have a floor that deflects too much, it's going to feel "bouncy" when you walk across it. Even if it's perfectly safe and isn't going to collapse, your kitchen tiles might crack, or your drywall might pop. If you're planning on a heavy granite island or a tile floor, you'll want to look for a beam that offers even less deflection than the bare minimum.
Bearing Length is the Unsung Hero
One mistake I see people make all the time is focusing entirely on the span and forgetting about where the beam sits. Even if the lp lvl span chart says a specific beam can handle an 18-foot span, that beam still needs enough "bearing" on each end to transfer that weight down to the foundation.
Usually, you need at least 1½ to 3 inches of bearing on each end. If you're carrying a massive load over a long distance, you might need three or four jack studs to support the ends of those LVLs. The chart will often have a small footnote or a separate table telling you the required bearing length. Don't skip that part. If the wood under the beam gets crushed because the bearing area is too small, the strength of the LVL doesn't matter much.
Multi-Span vs. Simple Span
Another nuance to watch out for is whether you are dealing with a simple span or a multi-span. A simple span is a beam supported at both ends with nothing in the middle. A multi-span is a long beam that has one or more supports in the center.
Believe it or not, a beam that is continuous over a center support is actually stronger and stiffer than two separate beams butted together over that same support. The lp lvl span chart will often have different sections for these scenarios. If you can get a single 24-foot LVL to cover two 12-foot spans, it's almost always better than using two 12-footers.
When to Put Down the Chart and Call a Pro
I love a good DIY project as much as anyone, and for a simple door header or a small floor reinforcement, an lp lvl span chart is exactly what you need. But there are times when the chart just isn't enough.
If you have "point loads"—like a post from the floor above sitting directly in the middle of your new beam—the standard uniform load charts won't give you the right answer. Point loads require specific calculations that factor in exactly where that weight is hitting the beam. In those cases, or if you're dealing with complex roof hips and valleys, it's worth the few hundred bucks to have a structural engineer take a look. They can run the numbers through software and give you a stamped drawing that will make the building inspector happy and keep your house standing straight.
Final Thoughts on Using the Data
At the end of the day, an lp lvl span chart is a tool, just like your circular saw or your impact driver. It gives you the confidence to know that the skeleton of your building is solid. It's always better to overbuild slightly than to try and save twenty dollars on a beam that's "just barely" big enough.
Take your time, double-check your load math, and always make sure you're looking at the most recent version of the chart from the manufacturer. Standards change, and you want the most up-to-date info for your build. Once you get that beam into place and see how rock-solid it feels, you'll be glad you did the homework.