Deck Skirting Calculator

Usually no — skirting is not structural and most jurisdictions don't require a permit. EXCEPTIONS: (1) if skirting is part of new deck construction (covered by deck permit), (2) if you're enclosing the under-deck space for storage/conditioned area (then IRC R408 applies fully), (3) if stone veneer adds dead load > 15 PSF to deck framing (rare). Check with local building dept if uncertain.

Depends on priorities. For DIY + cheapest: vinyl lattice ($5/sqft) — prefab 4×8 sheets cut to size, click-into-frame. For longest life + low maintenance: composite/PVC panel ($11/sqft) — 30-yr warranty, brand-matched to deck. For premium aesthetic: stone veneer ($18/sqft) — looks like real stone foundation, masonry skill required. For traditional look: cedar lattice ($7.50/sqft) — silvery patina, no stain needed. PT is cheapest but needs re-stain every 2-3 years.

Yes — IRC R408.1 requires 1 sqft of vent area per 150 sqft of under-deck floor area when enclosed. Lattice naturally passes (55-60% open area). Slat passes for most deck sizes (25% open). Solid panel + stone veneer FAIL — require foundation vents added every 4-8 ft. Without ventilation, trapped moisture rots joists + posts within 5-10 years. The calculator auto-checks compliance and surfaces required foundation-vent count.

Almost always yes. Reasons: (1) utility access — sprinkler valves, gas lines, electrical junction often run under decks, (2) storage — kayaks, lawn gear, deck-cushion storage, (3) pest inspections — check for rodent/wasp nests annually, (4) drainage clearance — pull leaves/debris from grade. Access door kit: $165 average (hinges + latch + frame). Standard size 2.5 × 2.5 ft.

Yes for lattice, slat, and aluminum panel — these are weekend DIY projects (10-18 hrs for a typical 36 LF deck). Composite/PVC panel needs precise cuts and is more challenging but still doable (15-25 hrs). Stone veneer requires masonry skill — NOT DIY for most homeowners. DIY tools needed: circular saw or miter saw, drill, level, square, work gloves. Vinyl lattice is the easiest DIY — pre-cut to size at the store.

Skirting should reach from grade to ~2 inches below the deck framing's bottom edge (leaves drainage gap). Typical heights: 2-3 ft for low decks (30-50″ above grade), 4-6 ft for raised decks (5-8 ft above grade), 7-10 ft for elevated 2nd-story decks. Tall skirting (> 4 ft) needs structural backing — recommend 16″ OC studs framework. Skirting > 6 ft tall is often more practical as a finished wall than open skirting.

Only if you skip ventilation. Open-style skirting (lattice, slat) provides adequate airflow naturally. Solid skirting (composite panel, stone) MUST have foundation vents to prevent moisture buildup. Also add a 6-mil polyethylene vapor barrier on the ground under the enclosed space (IRC R408.2). Sloped grade away from the deck helps. Don't enclose unless you can ventilate properly — trapped moisture causes joist rot.

For solid panel skirting (composite, stone veneer): need a backing framework + foundation vents. Backing: PT 2×4 stud frame at 16″ OC attached to deck posts + bottom rail. Foundation vents: 8×16″ vents (~0.55 sqft each at $38) installed every 4-8 ft to meet IRC R408.1 (1 sqft per 150 sqft floor area). The vents stay accessible from outside even after skirting installed.

Material lifespan: PT 12 yrs, cedar 20 yrs, composite/PVC 30 yrs, aluminum 35 yrs, vinyl lattice 25 yrs, stone veneer 50 yrs. Lifespan reduced 30-40% if ground-contact + no PT (decay accelerates at moist grade). Best practice: keep skirting 2-3 inches above grade with PT 2×4 cleat as ground-contact buffer. Re-stain PT/cedar every 2-3 years to maintain look. Composite/PVC need only annual rinse.