Quick Answer
To skirt a house on piers, build a perimeter frame of ground-contact pressure-treated lumber (a bottom rail at grade and a top ledger fastened under the rim joist), add vertical nailers every 16 to 24 inches, bury hardware cloth to stop animals, then attach vinyl, lattice, fiber-cement or faux-stone panels. Include crawl space vents and an access door. Most DIYers finish in one or two weekends.
Key Takeaways
- Skirting must breathe: plan roughly 1 square foot of net vent area for every 150 square feet of crawl space unless your local code allows a sealed design.
- Use ground-contact rated pressure-treated lumber for anything within 6 inches of soil.
- In frost or expansive-soil areas, let the skirting float so ground movement does not crack panels or lift the house trim.
- Flood zones have special rules; check with your building department before enclosing a raised home.
- Leave a removable access panel at least 18 by 24 inches so plumbers and inspectors can get underneath.
A pier-and-beam house looks unfinished when you can see straight under the floor, and that open gap also lets in wind, animals and blowing debris. Skirting closes the gap, protects pipes from cold air and gives the home a finished base. This guide walks you through choosing a material, building the frame and installing panels so the crawl space stays dry and ventilated.
What Is House Skirting and Why Does a Pier Home Need It?
Skirting is a non-structural wall that runs around the perimeter of a raised house, from the soil up to the bottom of the siding. It does not carry any load; the piers still hold up the house. Its job is to screen the crawl space, block wind and animals, and protect plumbing, ductwork and insulation from weather.
Without skirting, cold air moves freely under the floor in winter, which raises heating bills and increases the risk of frozen pipes. Raccoons, skunks, opossums, stray cats and snakes also love an open, sheltered crawl space. A tight skirt with a buried critter barrier solves both problems.
Which Skirting Material Should You Choose?
Pick a material based on budget, climate, the look of your house and how much maintenance you want. Here is how the common options compare.
| Material | Look | Durability | DIY Difficulty | Best For |
|---|---|---|---|---|
| Vinyl skirting panels | Clean, siding-like | Good; can crack when cold and struck | Easy | Budget projects, manufactured and pier homes |
| Pressure-treated wood lattice | Traditional, open | Fair; needs stain or paint | Easy | Mild climates, beach cottages, maximum airflow |
| Vinyl or PVC lattice | Open, crisp white or colors | Good; no rot | Easy | Low-maintenance open skirting |
| Fiber-cement panels | Painted, solid | Very good; rot and insect resistant | Moderate (heavy, dusty cuts) | Matching fiber-cement siding |
| Faux stone or brick panels (polyurethane or resin) | Masonry look | Good | Moderate | Higher-end appearance without masonry |
| Concrete block or brick curtain wall | Permanent masonry | Excellent | Hard; usually needs a footing | Long-term homes, high-wind areas |
| Corrugated metal | Rustic or modern | Very good if coated | Moderate (sharp edges) | Farmhouse or industrial styles |
If you prefer a solid, insulated look, rigid foam board behind a decorative face panel adds R-value. Just make sure your vents still meet code. For a project that pairs well with skirting, see our guide on building an addition on piers.
What Do You Need Before You Start?
Gather everything before you start digging so the perimeter does not sit half open overnight.
- Lumber: ground-contact rated pressure-treated 2x4s for bottom rails, top ledgers and vertical nailers.
- Panels: your chosen skirting, plus J-channel or trim if you use vinyl.
- Critter barrier: galvanized hardware cloth, 1/4-inch or 1/2-inch mesh.
- Vents and access door: foundation vents sized to your square footage and a hinged or removable access panel.
- Fasteners: hot-dipped galvanized or stainless screws and nails rated for treated lumber.
- Tools: tape measure, string line, 4-foot level, circular saw with a fine-tooth blade, drill/driver, shovel, tin snips, staple gun and safety glasses.
How Do You Skirt a House on Piers Step by Step?
Step 1: Measure the Perimeter and Plan Your Layout
Measure each wall at the rim joist and record the height from grade to the bottom of the siding at several points, because the ground is rarely level. Sketch where vents, the access door, hose bibs, dryer vents and utility entries fall. Order about 10 percent extra material for cuts and mistakes.
Step 2: Check Codes, Flood Rules and Utilities
Call your local building department to ask about vent requirements, access openings and whether your lot is in a FEMA flood zone, where enclosures under elevated homes often need flood openings or breakaway construction. Call 811 a few days before you dig so buried gas, electric and water lines get marked.
Step 3: Clear and Grade the Perimeter
Remove plants, rocks and debris from a strip about 18 inches wide around the house. Shape the soil so it slopes away from the house; water that pools against skirting ends up in the crawl space. Dig a shallow trench 6 to 12 inches deep along the skirting line for the critter barrier.
Step 4: Install the Top Ledger
Fasten a pressure-treated 2×4 ledger to the underside or face of the rim joist, flush with or just behind the siding line. Snap a chalk line or run a string so the ledger is straight. This board gives the tops of your panels a solid nailing surface.
Step 5: Set the Bottom Rail
Lay a ground-contact 2×4 bottom rail on a compacted gravel bed or tamped soil, directly under the ledger. Check it with a plumb line or level so the skirting will stand vertical. In freeze-thaw or expansive clay areas, do not fasten the bottom rail to the piers; let it float so frost heave lifts the rail, not the house trim.
Step 6: Add Vertical Nailers
Cut 2×4 studs to fit between the bottom rail and the top ledger and space them 16 to 24 inches on center, closer for thin vinyl and wider for rigid panels. Add extra nailers around vent and door openings. In floating installations, attach studs to the ledger with a slotted connection or leave a small gap so the frame can move.
Step 7: Install the Critter Barrier
Staple galvanized hardware cloth to the bottom rail and bend it outward into the trench in an L shape, then backfill. Animals that dig at the skirt hit the buried mesh and give up. This step adds an hour or two but prevents the most common skirting complaint.
Step 8: Attach the Skirting Panels
Start at a corner and work around the house, following the panel manufacturer’s instructions for overlap and fastener spacing. Vinyl panels hang in a top channel and should be nailed loosely in the center of the slots to allow expansion. Lattice and fiber-cement panels screw directly to the nailers; pre-drill fiber-cement near edges.
Step 9: Cut In Vents and the Access Door
Install foundation vents within about 3 feet of each corner and evenly along long walls so air crosses the whole crawl space. Frame a rough opening for an access door at least 18 by 24 inches, located where you can reach plumbing shutoffs. Use hinges or turn buttons rather than screws so the door opens without tools.
Step 10: Trim, Seal and Inspect
Add corner posts, top trim and J-channel to cover cut edges. Caulk gaps where pipes and cables pass through, but never seal vents. Walk the perimeter, check every panel for loose fasteners and make sure soil still slopes away from the house.
How Much Ventilation Does a Skirted Crawl Space Need?
The International Residential Code, which most U.S. jurisdictions adopt in some form, calls for at least 1 square foot of net free vent area for every 150 square feet of crawl space floor area in a vented crawl space. If the soil is covered with a Class I vapor retarder, that can drop to 1 square foot per 1,500 square feet. Net free area is printed on the vent label and is smaller than the vent’s outside dimensions because of the screen and louvers.
Example: a 1,200-square-foot house needs about 8 square feet of net vent area without a ground vapor barrier. Some homeowners instead build a closed, conditioned crawl space, but that requires sealed walls, insulation and a dehumidifier or supply air, so it is a bigger project best planned with a contractor.
Tip: Lay 6-mil or thicker polyethylene over the soil under the house before you close the skirting. It reduces crawl space moisture and is far easier to install while the sides are open.
What Mistakes Should You Avoid?
- Blocking airflow. Solid skirting with no vents traps moisture, leading to mold, rot and sagging floors.
- Using untreated or above-ground lumber at grade. It can rot within a few seasons.
- Locking the frame to the house in frost country. Heaving soil pushes panels up and can crack them or tear trim.
- Skipping the access door. A plumber who has to cut through your skirting will not patch it neatly.
- Grading toward the house. Water runs straight into the crawl space and undermines piers.
- Covering dryer or furnace vents. Exhaust must vent outside the skirting, not into the crawl space.
If you spot cracked piers or settling while the perimeter is open, fix those first. Our guide to repairing foundation cracks in concrete walls covers small concrete repairs.
How Long Does Skirting Last and How Do You Maintain It?
Vinyl and PVC lattice typically last decades with little care beyond washing. Wood lattice needs stain or paint every few years and replacement of rotted pieces. Fiber-cement holds paint well and resists insects. Once a year, check that vents are clear, the critter barrier is intact and no gaps have opened at corners.
If you plan to cut corrugated panels for vents or a rustic metal skirt, our guide on cutting corrugated plastic sheeting explains clean-cut techniques. Skirting also pairs naturally with projects such as enclosing a porch on a raised home.
When Should You Hire a Professional?
Call a contractor if your house sits more than about 4 feet off the ground, is in a flood zone that requires engineered flood openings, or needs a masonry curtain wall with a footing. A structural engineer should look at any pier that is leaning, cracked through or sinking. If you want a sealed, conditioned crawl space, a crawl space specialist can size insulation and dehumidification correctly.
Frequently Asked Questions
What is the cheapest way to skirt a house on piers?
Vinyl skirting panels or pressure-treated wood lattice are usually the least expensive options. Both install with basic tools on a simple 2×4 frame. Lattice costs little up front but needs painting or staining, while vinyl costs a bit more and needs almost no upkeep beyond occasional washing.
Does skirting have to be vented?
In most cases, yes. Building codes based on the International Residential Code require vents for a standard crawl space, roughly 1 square foot of net free area per 150 square feet of floor. The exception is a sealed, conditioned crawl space that is insulated and dehumidified to code.
Can I insulate pier house skirting?
You can add rigid foam board behind the skirting panels to cut drafts, but keep the required vents open unless you are building a fully sealed crawl space. Insulating the floor between joists is often more effective in a vented crawl space because it keeps heat in the living area.
How do I keep animals from getting under skirting?
Bury galvanized hardware cloth along the bottom of the skirting, bent outward in an L shape 6 to 12 inches below grade. Use screened vents, keep the access door latched and seal pipe penetrations. Check the perimeter each spring for new dig marks.
Do I need a permit to add skirting to my house?
Many towns treat skirting as minor exterior work that needs no permit, but rules vary. Permits are more likely in flood zones, for masonry curtain walls, or for manufactured homes in parks with their own standards. A quick call to your building department settles it.
