Skirting closes the perimeter below a manufactured home, but it is not merely decoration. A design can affect drainage, ground moisture, ventilation, freeze exposure, pest entry, access, dryer exhaust, combustion appliances, ducts, plumbing, and inspection of the support system. Adding insulation without evaluating those systems can trap moisture or create a safety problem.
Start with the home’s installation documents and local authority
Find the manufacturer’s installation manual, data plate information, foundation or installation records, and later alteration permits. Ask the local building authority what current rules apply to a repair, replacement, masonry enclosure, access opening, utility work, and any foundation change. A non-structural skirt must not be described or built as a foundation unless it is engineered and approved as one.
Correct bulk water before enclosing the perimeter
Roof runoff, downspouts, grade, ditches, plumbing leaks, HVAC condensate, and high ground water should be corrected before new skirting. HUD’s Model Manufactured Home Installation Standards address drainage away from the home and ground-moisture control when the underside is enclosed. Enclosing a wet site can concentrate moisture against the underbelly, subfloor, frame, ducts, and insulation.
Do not enter a crawlspace with standing water, exposed wiring, sewage, gas odor, unstable supports, animals, or suspected contamination. Use the appropriate licensed or qualified professional.
Ventilation is a design requirement, not a universal vent count
Ventilation depends on the governing installation standard, local amendments, climate, ground vapor retarder, home design, and whether a professionally designed conditioned-crawlspace approach is permitted. Older rules of thumb copied online may omit exceptions and corner, cross-ventilation, or ground-cover provisions.
Do not block existing required vents or combustion air. Do not terminate a clothes dryer, exhaust fan, furnace, or water-heater vent under the home. The appliance and home manufacturer’s instructions control, and fuel-burning equipment requires combustion-safety review.
Ground vapor retarder and belly board do different jobs
A ground vapor retarder limits moisture from soil. The belly board contains floor insulation and helps complete the home’s underside air-control layer. Skirting encloses the perimeter. None substitutes for repairing a plumbing leak, torn underbelly, damaged duct, poor drainage, or unsafe support.
Material type, thickness, seam and pier detailing, termination, and ventilation approach should follow the applicable design. Avoid laying sharp debris under a membrane or trapping water above it.
Choose a skirting system by performance and service needs
| Question | What to verify |
|---|---|
| Wind and impact | Approved attachment, framing, panel rating, clearances, and replaceable sections for the site exposure. |
| Moisture | Drainage, ground treatment, ventilation or approved conditioned design, corrosion resistance, and drying potential. |
| Freeze protection | Pipe location and insulation, belly integrity, heat-trace listing where used, and power-failure planning. Skirting alone does not guarantee pipes will not freeze. |
| Fire and combustion | Required clearances, appliance air, flues, vents, dryer exhaust, and material fire characteristics. |
| Access | Code- and manufacturer-compliant openings for shutoffs, crawlspace inspection, plumbing, HVAC, anchors, and emergency service. |
| Pests | Durable closure of entry points without blocking drainage, ventilation, or equipment access. |
| Appearance | Compatible trim, movement allowance, grade clearance, and a finish that can be maintained. |
Insulation claims need an energy model, not a sales slogan
No honest guide can promise a fixed heating-cost reduction from “insulated skirting.” Results depend on the existing belly insulation and air leakage, ducts, climate, thermostat, fuel, home size, ground moisture, and how the crawlspace is designed. Start with a qualified energy assessment and repair large duct, air, insulation, and moisture defects in the correct order.
DOE’s manufactured-home weatherization job aids cover belly insulation, ducts, vapor retarders, and other assemblies. They are training resources, not permission to ignore permits, manufacturer instructions, or site-specific design.
What a written contractor scope should include
- material manufacturer, product, finish, warranty, and fire or impact ratings;
- framing and attachment method, wind considerations, movement details, and grade clearance;
- drainage and ground-moisture work;
- calculated ventilation or approved conditioned-crawlspace design;
- access locations and treatment of utilities, dryer exhaust, and combustion equipment;
- permits, inspections, exclusions, cleanup, and before/after photos.
Sources and review note
- eCFR: 24 CFR Part 3285 — Model Manufactured Home Installation Standards
- DOE: Manufactured-home weatherization job aids
- EPA: Moisture control in crawlspaces
Reviewed August 25, 2026. Cost, lifespan, R-value, energy savings, ventilation, and installation details vary by product, home, climate, code, and site. Obtain current written quotes and approved specifications.
Repairs bigger than you want to take on?
If the manufactured home will sell with land you own, Roger can evaluate the property as-is. An inquiry is not an offer, and condition, records, and closing requirements still control the decision.