A deck with skirting looks finished. A deck without it looks like the crew got called away mid-project. Ours sat exposed for the better part of a year, red clay and weeds doing a solid impression of an abandoned job site underneath a deck we were otherwise proud of. That gap between "finished on top" and "disaster underneath" is basically the whole case for deck skirting, and it's also where most of the good questions about backyard porch skirting start.
So here's the short version, since we get asked some form of these same things whenever someone spots the horizontal boards from the driveway: yes, you need airflow gaps, no, plastic lattice isn't your only option, and the wood you use underneath matters more than almost anything else you'll pick for this project. Everything else is just working out the details for your own slope, your own lumber, and your own patience level.
Skirting or No Skirting: What Actually Changes Under the Deck?
Skirting isn't just cosmetic, even though ours started out as a pure appearance fix. Once boards go up around the base, you've closed off the crawlspace from stray animals, blocked the view of whatever scrap lumber and half-used bags of something-or-other end up stashed under there, and, if you leave the right gaps, kept air moving so the joists above don't sit in a pocket of trapped moisture all summer. Skip it, and you've got an open invitation for anything on four legs looking for shelter, plus a straight view into the part of an outdoor renovation nobody wants photographed.
Solid Boards Instead of Plastic Lattice
We went back and forth on this longer than we'll admit. Lattice is cheap, it's everywhere, and it would've taken us an afternoon. But it reads as an afterthought the second you look at it closely, so we picked 1x6 pressure-treated boards run horizontally instead, spaced with gaps rather than overlapped tight. Our neighbor Dale leaned over the fence partway through the lumber run and called anything under a 2x6 "sissy lumber" — that's his line for basically every board we've ever bought, so we didn't take it personally. Worth knowing before you buy: a nominal 1x6 doesn't actually measure six inches, it's 5.5, and that gap between the label and the tape measure catches a lot of first-timers off guard when they're trying to figure out how many rows they need.
Why We Left Gaps Instead of Sealing It Tight
This is the part people get wrong most often, us included on the first attempt. It's tempting to push the boards edge to edge so nothing's visible underneath at all. DON'T. A sealed crawlspace traps moisture, and trapped moisture rots joists from the inside where you can't see it happening until it already is a problem. We ran a carpenter's pencil along the top of each board as a spacer before setting the next one — cheap, consistent, no fancy tool required — and left just enough of a shadow line that the gaps ended up reading as a design choice instead of an accident. There's a longer technical conversation about wood movement and why boards need room to swell and shrink with humidity, but the short version for anyone skirting a deck is simple: give the wood room, don't fight it.
What Wood Rating Actually Belongs at Ground Level
We didn't grab the cheapest pressure-treated stack at the store for the bottom run. Wood sitting against red clay needs a heavier-duty rating than the boards higher up the wall, and the difference between ground-contact and above-ground treatment is spelled out by groups like the American Wood Protection Association — we're not going to pretend we're chemists, but we know enough to ask for the right rating by name at the counter instead of guessing. We also leaned on the ventilation guidance in the International Residential Code rather than eyeballing our gap sizes, mostly because "that looks like enough air" isn't a standard either of us trusts ourselves with. None of this needed anything exotic tool-wise, either — an impact driver, a miter saw, and a level covered the whole job, which is about the same short list that covers most backyard builds around here.
Working a Sloped Yard Without Ending Up Crooked
Here's where we actually lost a day. The ground behind our porch drops toward the woods, so every vertical cleat needed to be a different length just to keep the bottom line level, which is its own exercise in patience — the same fight anywhere you're chasing square, level, and plumb against ground that refuses to cooperate. It's really a grading and drainage problem wearing a skirting costume, the same kind of headache that shows up anywhere water needs somewhere to go besides your foundation. Instead of buying an actual set of plans for the layout, we tried to piece it together from a stack of YouTube videos and a lot of confidence. We got four boards in — upside down relative to the slope — before we realized it looked like a staircase running the wrong direction. Full teardown, plus a wasted sheet of plywood we'd already cut wrong trying to template the angle. That mistake is basically the whole reason we finally stopped wasting lumber and sanity on projects without buying real plans first. If your own yard has a drop like ours and you're earlier in the process, our piece on How to Build a Floating Deck for a Ground Level Seating Area covers the foundation side of the same slope problem.
Is Deck Skirting Worth the Extra Weekend?
Ruben, a neighbor who's asked us about half the projects on this lot at this point, walked over while we had cleats half-installed and wanted to know if it was really worth the extra work instead of just buying lattice panels and calling it done. He owns enough tools to stock a rental counter and has never once opened an instruction manual for any of them, so it was a fair question from someone who mostly just wants the job finished. Our answer: if you're already living with a finished deck on top and an eyesore underneath, yes — solid boards cost more time than lattice, not more money worth losing sleep over, and the payoff is a crawlspace that stays dry instead of one that's quietly rotting where nobody's looking. It's a little like leaving slack in a budget instead of spending down to the last dollar. Skip the buffer and the first bad month wrecks the whole plan. The same pencil-width spacing trick carried over almost exactly when we wrote about Choosing the Best Deck Railing for a Safe Backyard Build, which tells you how much of backyard building is really the same three or four tricks reused on different parts of the house.
We picked up the trim screws on a lumber run to Tractor Supply in Siler City, mostly because it was already on the list for other errands — two-inch stainless over galvanized, since the black streaking that galvanized leaves on treated wood after a few seasons was one thing we specifically wanted to avoid. None of this needed a permit. Unlike the raised deck we built the year before, skirting this low to the ground doesn't usually trip the thresholds that get an inspector involved, though it's worth a quick call to your own county before you assume the same holds for yours. This also isn't predator-proof hardware like what our coop run needed — it's just enough of a physical barrier to keep the neighborhood cats from adopting the space, with gaps too narrow for anything bigger to squeeze through.
What we ended up with wasn't just a fix for the ugly space. It's a ventilated, ground-rated barrier that protects the joists and makes the whole porch look like someone finished the job on purpose, gaps and all. It's stuck with us the same way it did the year our raised beds kept sending out fresh kale well past the point we'd normally have written the season off. Some of the best backyard projects are the ones that just keep quietly working long after you've stopped thinking about them. Now if we could just finish that workshop out back, we might actually get a car in the garage again. But that's a story for another weekend.