Deck Skirting: Ventilation, Pests and Wildfire Embers

We may earn commission from links on this page. Lead-form submissions are forwarded to local inspector partners. How we research and review.

The space under a raised deck is easy to forget. From the yard, most homeowners see only the skirting, the lattice, boards or panels that close in the gap between the deck and the ground. Yet that hidden space affects how long the framing lasts, whether skunks or rodents move in, and how a house fares when wind-driven embers arrive during a wildfire. Good deck skirting hides clutter and finishes the look of the deck while still letting air move, keeping animals out, and leaving a way in for inspection. Poorly planned skirting traps moisture, shelters pests and collects the dry leaves and stored lumber that embers can ignite. This guide compares skirting materials, explains ventilation and access, covers pest and wildfire considerations relevant to the Colorado Front Range, and outlines typical 2026 costs.

Part of our Structure & Exterior guide — start there for the full picture →

What Deck Skirting Does and Why It Matters

Deck skirting is a screen or wall installed around the perimeter of a raised deck, running from the underside of the rim joist down to grade. Its main jobs are appearance and enclosure: it hides posts, footings, bare soil and anything stored beneath the deck. But skirting also shapes the conditions under the deck in ways that matter to the structure and the house.

Done well, skirting:

• Leaves enough open area for air to dry out the framing after rain and snowmelt.
• Keeps larger animals from denning under the deck.
• Provides at least one access point for inspections and repairs.
• Limits the amount of leaves, needles and trash that blow under the deck.

Done poorly, it creates a damp, dark, enclosed space that rots joists and posts, invites nesting animals, hides structural problems and stores fuel right against the house. The difference often comes down to material choice, ventilation and whether anyone can get under the deck to look.

Skirting Materials: Lattice, Boards and Composite

Most residential deck skirting falls into a few categories. Each balances cost, airflow, durability and appearance differently.

Lattice panels

Lattice is the traditional choice: crisscrossed strips of treated wood or vinyl in 4×8 sheets, framed with trim. It is inexpensive, quick to install and very open, which helps ventilation. The downsides are durability and pest resistance. Thin wood lattice warps, splits and loosens at staples, and animals can push through weakened sections. Vinyl lattice lasts longer but can become brittle in cold weather and crack when struck. Small-opening lattice limits what fits through the holes, but the openings are still large enough for mice and many insects.

Horizontal or vertical boards

Board skirting uses deck boards or fence-style boards fastened to a simple frame, usually with gaps between boards. It looks more finished than lattice and can match the deck surface. The trade-off is airflow: tightly spaced boards can make the space under the deck noticeably damper. Leaving consistent gaps between boards, or using alternating boards on each side of the frame, keeps a solid look while preserving air movement. Boards in contact with soil should be rated for ground contact or kept above grade on a gravel strip.

Composite and PVC panels

Composite and PVC skirting boards or panels resist rot and insects and pair well with composite decks. Many manufacturers offer slotted or louvered panels designed to ventilate. These materials expand and contract with temperature, so fastening and gapping instructions need to be followed. Our composite decking guide covers how these products behave over time, including heat and fading in high-altitude sun.

Masonry, stone and metal

Some homeowners close in decks with stone veneer, stucco over framing, or metal mesh and perforated panels. Masonry and solid walls block airflow unless vents are built in. Metal mesh, especially fine galvanized or stainless hardware cloth, offers excellent ventilation and pest resistance and can be framed for a clean look.

Ventilation Under Decks: Preventing Rot

Wood framing lasts longest when it can dry. Under a deck, moisture comes from rain dripping between boards, snowmelt, damp soil, sprinklers and runoff from roof gutters. If skirting closes the space tightly, that moisture lingers. The result can be fungal decay in joists, beams and posts, rusted connectors and, eventually, structural problems. EPA’s moisture guidance for homes puts it simply: the key to mold control is moisture control, and wet materials dried within 24 to 48 hours usually do not grow mold. The same principle applies to deck lumber.

Ways to keep the under-deck space drier include:

• Leave generous open area in the skirting. Gapped boards, louvered panels, lattice or mesh all ventilate better than solid walls.
• Keep the bottom of the skirting off the soil by an inch or two, or seat it on gravel, so it does not wick water and so air can enter low.
• Grade the soil to drain away from the house. Low spots under decks often collect water, especially beside the foundation.
• Lay landscape fabric and gravel to reduce weeds and surface moisture.
• Fix gutter overflow and downspouts that dump onto or under the deck.

Low decks with only a few inches of clearance are the hardest to ventilate. In those cases, building codes and board manufacturers often set minimum clearance or ventilation requirements, and some composite products need specific airflow to avoid heat buildup or warping. When a frame already shows soft wood, fungal growth or rust, the wood rot repair guide explains what can be repaired and what should be replaced.

Access Panels for Inspection and Repairs

Skirting that is permanently fastened all the way around makes it impossible to see the footings, posts, beam connections and the underside of the ledger without pulling it apart. That is a problem at resale, because an inspector cannot evaluate what cannot be seen, and it is a problem for owners who never notice a failing post until the deck sags.

A hinged door or a removable section of skirting solves this. Good access panels:

• Are large enough for an adult to crawl through, or at least to see and photograph the framing.
• Sit near the ledger or the most critical connections.
• Use corrosion-resistant hinges and a latch that keeps animals from pushing them open.
• Are not blocked by planters, storage bins or grills.

The ASHI Residential Deck Inspection Standard has inspectors look at visible components such as ledgers, joists, beams, posts and footings, and notes that components that are not readily accessible are not required to be inspected. Enclosed decks without access often get reported that way, with a recommendation for further evaluation. Our deck inspection guide covers what a thorough review includes.

Keeping Animals and Insects Out

A sheltered, dry space under a deck is attractive to wildlife. Along the Front Range, common under-deck residents include mice, rats, skunks, raccoons, rabbits, snakes and stinging insects. Some are only a nuisance. Others bring droppings, odors, damage to wiring and insulation if they move into the house, and health concerns.

Rodents

The Centers for Disease Control and Prevention advises sealing gaps and holes around the home and notes that mice can fit through a hole the width of a pencil, about a quarter inch. CDC suggests hardware cloth, metal sheeting or similar materials for larger openings, recommends using flashing around the base of the house, and advises keeping woodpiles at least 100 feet from the home and raised off the ground and clearing brush and weeds near the house. Lumber, firewood and clutter stored under decks provide exactly the shelter rodents look for. Our rodent home inspection guide covers signs of activity and safe cleanup.

Larger animals

Skunks, raccoons and foxes often dig under skirting rather than push through it. An L-shaped footer of galvanized hardware cloth, buried several inches deep and bent outward away from the deck, discourages digging. Before sealing any opening, owners should confirm nothing is still living underneath, since trapping an animal inside creates a bigger problem. Local wildlife rules may apply to removal.

Wasps and stinging insects

Yellowjackets and other wasps sometimes nest in the ground under decks or in the cavities of hollow skirting frames. Nests in these spots are easy to disturb while mowing or crawling under the deck. The wasp nest removal guide covers when to call a professional.

Wildfire Embers and Combustible Debris Under Decks

For homes in or near the wildland-urban interface, which describes much of the Colorado foothills and many Front Range neighborhoods, the space under a deck is a known weak point during wildfires. The National Fire Protection Association explains that research on home survival points to embers and small flames as the main way most homes ignite, and that embers can be carried more than a mile by wind.

NFPA’s home-preparation guidance for the immediate zone, the area within 5 feet of the house, includes screening or boxing in areas below patios and decks with wire mesh to keep debris and combustible materials from accumulating, and removing anything stored underneath decks or porches. That advice lines up directly with skirting choices:

• Fine metal mesh skirting can keep out wind-blown leaves and needles while still ventilating.
• Open lattice lets debris drift in; it may look tidy from the yard while a layer of dry leaves builds up underneath.
• Stored items such as firewood, lumber, cushions, propane cylinders and plastic bins add fuel directly beneath the house.
• Combustible skirting itself, including thin wood lattice and some plastics, can carry flame to the deck framing.

Noncombustible ground cover such as gravel under and around the deck, regular raking of debris that does get in, and mesh with small openings all reduce risk. Our defensible space guide covers the zones around a home, and the fire-resistant house materials guide compares decking and siding choices for high-risk areas. Some Colorado counties and fire districts have their own wildfire mitigation rules for decks and skirting, so checking local requirements before a rebuild is worthwhile.

Composite Decks and Skirting Compatibility

Composite and PVC decks are often marketed as low maintenance, but the framing under them is usually still pressure-treated wood. Because composite boards can last decades, the frame needs to last too, which makes under-deck ventilation even more important. Manufacturers frequently specify minimum airflow and clearance for low decks, and enclosing a composite deck with solid skirting can conflict with those instructions and may affect warranty coverage.

Matching composite skirting boards or panels are available from most decking brands. Using them with a ventilated frame or spaced layout keeps the look consistent while letting the frame breathe.

Installation Details That Make Skirting Last

Skirting fails most often at its attachments and at the bottom edge. A few construction details separate skirting that lasts a decade or more from skirting that sags after a couple of winters.

• Build a frame, not a facade. Fastening lattice or boards directly to deck posts leaves long unsupported spans. A simple frame of treated 2x4s between posts, with a bottom rail, keeps panels flat and gives fasteners something solid to bite.
• Use ground-contact lumber near soil. Any wood within a few inches of grade, or likely to be buried by snow or mulch, should be rated for ground contact. Above-ground-rated lumber in that position often rots quickly.
• Choose corrosion-resistant fasteners. Hot-dip galvanized or stainless screws and staples hold up better against treated lumber and wet conditions than plain steel.
• Allow for movement. Vinyl, PVC and composite products expand and contract with temperature. Colorado can swing widely between a sunny afternoon and a cold night, so fixed, tightly pinned panels can buckle or crack.
• Plan for snow. Shoveled snow piled against skirting pushes on panels and holds moisture at the base. Sturdier framing on the side where snow is cleared helps.
• Keep the frame separate from siding. Skirting should not trap water against the house or cover weep screeds and foundation vents.

It also pays to look at what the skirting will hide before closing it in. Installing skirting is the best moment to clear debris, check footings and posts, add gravel and fix grading, because those jobs become harder once the perimeter is enclosed.

Typical Deck Skirting Costs

Costs depend on deck perimeter, height, material, access panels and local labor. The figures below are rough 2026 planning ranges for the Front Range and can vary widely:

• Wood or vinyl lattice panels: often the least expensive option, commonly a few dollars to around $10 per square foot installed, depending on framing and trim.
• Spaced wood board skirting: often moderate, frequently in the $10 to $25 per square foot range installed.
• Composite or PVC skirting: generally higher, often $20 to $40 or more per square foot installed.
• Metal mesh or hardware cloth framed panels: varies with gauge and framing; stainless mesh costs more than galvanized.
• Buried hardware cloth footer for animal exclusion: often added for a modest amount per linear foot if done with the skirting.
• Access door: a simple hinged section may add a few hundred dollars.

Material lifespan affects long-term value as much as the upfront price. Inexpensive wood lattice may need replacement within several years in sunny, exposed spots, while composite, PVC or metal mesh skirting often lasts far longer with little upkeep. Spending a little more on framing and fasteners is usually cheaper than rebuilding sagging panels later.

DIY installation lowers cost considerably for simple lattice or board skirting. Removing old skirting, cleaning out debris, correcting grading or repairing rotted framing exposed during the work can add significantly to the total.

What Buyers and Owners Should Check

The home inspection process typically includes decks, but enclosed decks limit what anyone can see. Before buying, or during routine maintenance, it helps to:

• Locate the access panel, or ask the seller whether one exists.
• Look for signs of animals: burrows, droppings, odors or chewed skirting.
• Check whether skirting touches soil or is rotting at the bottom edge.
• Note what is stored under the deck and how much debris has collected.
• Look for standing water, soft soil or efflorescence on the foundation beside the deck.

For more on what inspectors review around the outside of a house, see the structure and exterior hub.

References

• Preparing Homes for Wildfire — National Fire Protection Association
• How to Seal Up to Prevent Rodents — Centers for Disease Control and Prevention
• A Brief Guide to Mold, Moisture and Your Home — U.S. Environmental Protection Agency
• Residential Deck Inspection Standard — American Society of Home Inspectors

Not sure what is hiding under the deck? Contact us to connect with a local inspector who can review the framing, footings and skirting before closing.