Manufactured homes set on piers have water lines in the belly, the space between the floor joists and the bottom board. Wind under the home and a hard freeze can freeze those lines, and they leak when they thaw. Shut off the water, keep the belly open to air, and have wet insulation checked.
Key takeaways
- In a pier-set manufactured home, supply lines often run through the belly under the floor, where skirting gaps and wind can drop the temperature well below the air inside the house.
- A frozen line may not leak until it thaws. Water then pours into the belly insulation and subfloor, often out of sight, so a damp floor, a sagging bottom board or a drop in water pressure is a warning sign.
- Belly insulation soaks up water and holds it against the subfloor. Wet insulation, a wet bottom board and the floor decking above it all need to be checked and dried.
- Terrell sees roughly 40 to 50 frost days a year, and January nights average around 33 F. The February 2021 storm showed what a multi-day freeze does to uninsulated lines across North Texas.
- A restoration crew dries and cleans what the water reached. A licensed plumber repairs the line, and a manufactured home may need its belly wrap and skirting repaired after the crew finishes.
- Photograph before anything is moved, shut off the water at the home's shutoff, and call your insurer early. Ask your agent how your policy treats freeze damage and the belly.
Why do water lines freeze in a pier-set manufactured home?
A pier-set manufactured home sits above the ground on piers or blocks, so cold air and wind can blow under it. Supply lines in the belly sit between the floor and a thin bottom board with insulation around them. When skirting has gaps or the belly wrap is torn, the lines are exposed to the same cold as the outdoors.
A site-built slab house keeps most of its plumbing inside the walls and under a warm floor. A manufactured home is built differently. Its floor is a frame of joists with the supply and drain lines running through the space below, and a layer of insulation and a bottom board called belly wrap or belly board closing it in. When that layer is intact and the skirting keeps wind out, the belly stays above freezing in a typical cold snap. When it is torn, pulled down by animals or missing, the lines are in the open.
Small gaps matter more than people expect. A missing skirting panel, a vent left open, a gap at a porch or an addition, or a torn belly wrap lets wind sweep under the home. Water lines at the ends of the home, near the water heater closet and where lines pass through the floor are the usual freeze points, because they are close to outside air and farthest from the heated rooms.
How cold does it get around Terrell, and how often does it freeze?
Terrell's climate is humid subtropical, with an average January low near 33 F and roughly 40 to 50 frost days a year, according to climate summaries. Hard freezes usually come on a few nights a winter, and the February 2021 storm showed how a multi-day deep freeze can burst lines across North Texas.
February 2021 is the reference event for North Texas. The National Weather Service Fort Worth summary describes a storm that ran from February 13 to 17, with DFW Airport falling to minus 2 F on February 16 and spending 139 consecutive hours at or below freezing. Those are DFW Airport figures, not Terrell's. Pipes in uninsulated exterior walls burst across the region, and the Kaufman County District Attorney warned residents about plumbers who asked for money up front.
The pattern is the same for a manufactured home, only quicker. A multi-day freeze can drive the cold deep into a belly that has no heat source of its own, and the thaw is when the problems show up. If your home is in a part of Kaufman County where nights run colder, such as an open rural lot with no windbreak, plan accordingly.
What do you do when a belly-board line has frozen or burst?
Shut off the water at the home's shutoff, or at the meter or well pump if you cannot find it. Open the faucets, stay out of any water near outlets, and look for a damp floor or a sagging belly board. Photograph everything, call a licensed plumber for the line, and call a crew to dry the belly and floor.
The first move is to stop the water. Find the shutoff before winter, not during the emergency. On a rural lot it may be at the meter, at a pressure tank or at a well pump, and it may be under a cover or in a pit. If you cannot find it, shut off the pump or the main breaker for the pump if that is safe, and then call for help.
Do not try to thaw a frozen section with a torch or open flame. A hair dryer or warm towels on an exposed pipe is safer, but only when you can see the pipe and no water is leaking. A frozen line that has already split will pour water as it thaws, so leave a faucet open and be ready to shut the supply again.
Water that reached the belly hides. It runs down the insulation, pools on the bottom board and soaks the floor decking above. Signs include a soft or spongy spot in the floor, a cabinet door that sticks, a musty smell, a bulge in the underside, or a water meter that keeps running with all the fixtures off. Call (833) 490-5225 to reach a crew that can open the belly, remove soaked insulation and set drying equipment, and see our manufactured home water damage page for how that works.
How does a wet belly get dried?
A crew opens or cuts the belly wrap, removes insulation that has soaked up water, checks the floor decking and joists with a moisture meter, and sets air movers and dehumidifiers to dry what is left. The bottom board and insulation are replaced after drying. Readings are re-checked until materials reach goal.
Belly insulation is the sponge. Fiberglass holds water against the underside of the floor, and the closed belly keeps the air from moving. A floor can feel dry on top while the decking above a soaked belly is still wet, which is why the crew works from below as well as above.
The usual sequence is to open the belly in the wet area, remove and bag the saturated insulation, and set drying equipment so air moves through the cavity. Floor coverings may need to be lifted to dry the decking from above. Moisture readings are taken at the start and re-checked until the wood reaches goal, and photographs and readings can be shared with your insurer.
| Layer | What the water does | Typical response |
|---|---|---|
| Belly wrap or bottom board | Sags, tears or holds water like a bag | Opened or cut to drain; replaced after drying |
| Belly insulation | Soaks up water and holds it against the floor | Usually removed and replaced |
| Floor joists and rim | Wet, then dry slowly in a closed cavity | Dried with air movement and dehumidification |
| Floor decking and subfloor | Swells or softens; can hide moisture under flooring | Metered from above and below; dried or replaced if soft |
| Flooring and cabinets | Cupping, lifted seams, swollen toe kicks | Lifted or removed where wet |
| Skirting and ground below | Damp soil and trapped humidity | Dried and ventilated; skirting repaired |
Why is Mobile City a good example of manufactured-home water problems?
Mobile City, in Rockwall County on I-30 just east of Rockwall, began as an 8.8-acre trailer park and incorporated in 1990. Housing there is dominated by manufactured homes on piers or blocks with exposed under-floor plumbing, so belly lines and skirting are the main freeze and leak concern. Rural acreage in Kaufman County has the same setup.
Mobile City is small, with 142 people in the 2020 census, and its history shows where manufactured housing comes from in this area: a trailer park that grew into a city. Manufactured homes on pier or block foundations are also common on rural acreage around Terrell, Poetry and Quinlan, where a family may place a home on land they own.
If you live in a park or on leased land, read your lease and tell the park manager about a burst line quickly, since they may control the main shutoff or the service line. If you own the home on your own land, your own shutoff and your own plumber are your first calls. Our Mobile City page covers the local details, and our burst pipe water damage and frozen pipe water damage pages cover what the crew does in any home.
How do you prepare a manufactured home for a North Texas freeze?
Check that skirting is complete and the belly wrap is intact, seal gaps that let wind under the home, test heat tape if it is installed, and know where the water shutoff is. During a hard freeze, let faucets drip, open cabinet doors on exterior walls, and keep the home heated. Disconnect and drain outdoor hoses first.
Do the work in October or November, before the first hard freeze. Walk the full perimeter of the home and look for missing or loose skirting panels, open vents and gaps at steps and additions. Look underneath with a flashlight if the access panel allows, and check for torn or hanging belly wrap, and for animal damage, since rodents and other animals often nest in belly insulation.
During the freeze itself, keep the heat on, even if you leave. A home left cold during a multi-day freeze is the most likely to burst. Let one or two faucets drip, particularly on the exterior walls, since moving water is harder to freeze. Open cabinet doors under the kitchen and bathroom sinks so warm air reaches the lines. If you will be away, ask a neighbor to check the home, and know how to shut off the water from the street.
After a freeze, watch for leaks as the weather warms. A burst line often shows itself only when the ice melts, so check the water meter, the floor and the belly the next day. If you find water, repeat the steps above. Our North Texas frozen pipes guide covers freeze preparation for site-built homes as well, and it is worth reading if you own other property.
| Check | What to look for | When |
|---|---|---|
| Skirting | Missing or loose panels, gaps at steps and additions | Before the first hard freeze |
| Belly wrap | Tears, sagging, animal damage | Before the first hard freeze |
| Vents | Close foundation vents if the skirting design allows | Cold nights |
| Heat tape | Plug and thermostat work, wiring intact | Before the first hard freeze |
| Water shutoff | Know where it is and that it turns | Any time |
| Faucets and hoses | Disconnect hoses, drip faucets on hard-freeze nights | Each cold snap |
| Heat | Keep the thermostat set, even when away | Every freeze |
What does a belly or under-floor water job cost, and what about insurance?
Cost depends on how much belly insulation and flooring is wet, how many days of drying are needed and how much material is replaced afterward. Cost guides put minor single-room jobs at about $500 to $1,500 and Dallas-Fort Worth whole jobs at $1,200 to $5,000. Insurance typically covers sudden and accidental water, but your insurer decides.
Manufactured-home work does not have its own published price list, so the numbers above are general cost-guide ranges for water mitigation in the region and not a quote. A small burst caught within hours may be a small job. A line that leaked for days under a closed belly and soaked the decking is larger. The crew confirms the price on site, and the emergency-stage estimate is approved by you before work starts.
On insurance, a standard homeowners or manufactured-home policy often covers sudden and accidental water from a burst pipe, while long-term leaks are usually excluded, and freeze terms vary by policy. Some policies expect you to have kept the home heated or the water shut off. Ask your agent how your policy treats freeze damage and the belly, and tell the insurer early. Take photographs before anything is removed, and keep the crew's moisture readings.
| Scope | Typical range | Note |
|---|---|---|
| Minor damage, single room, minimal repair | $500 to $1,500 | Dallas-Fort Worth cost guide |
| Whole-job average, Greater Dallas-Fort Worth | $1,200 to $5,000 | Same guide |
| Category 1 (clean water) mitigation | $3 to $4 per sq ft | Frozen-line water is usually clean at first |
| Air mover, per unit per day | $22 to $50 | Equipment rate, varies |
| LGR dehumidifier, per unit per day | $75 to $150 | Sources show about $100 a day |
Frequently asked questions
How do I know a line froze if nothing is leaking?
Look for no water or trickling water at a faucet when the weather is cold. If one fixture is dry while others work, a section of line may be frozen. Open the tap, shut off any leak, and call a plumber before using heat.
Can I just replace belly insulation myself?
Wet insulation should be removed and the area dried first, because covering a wet floor with new insulation traps moisture. Have the decking metered, then replace the insulation and wrap after drying.
Does the park or landlord handle a burst line?
It depends on your lease and where the line is. A broken shared or service line is usually the park's, while lines under your own home are usually yours. Read the lease and tell the manager quickly.
Will mold grow in a wet belly?
It can. The EPA's 24 to 48 hour drying guideline is not a deadline, and a closed, damp belly is a place where mold can start. If you see or smell mold, Texas licenses mold assessors and remediators separately, so read our Texas mold law guide.
Should I leave the heat off to save money if the home is empty?
No. An unheated home during a hard freeze is the likeliest to burst. Keep the thermostat on, and consider a neighbor check or shutting off the water at the shutoff before you leave.
Sources
- NWS Fort Worth: February 2021 Winter Event
- Wikipedia: Mobile City, Texas
- Wikipedia: Manufactured housing
- Texas Department of Insurance: Home insurance
- Voda Cleaning & Restoration: cost of water damage restoration in Greater Dallas Fort Worth
This guide is general information for Kaufman County homeowners, not a substitute for an on-site inspection. Prices are estimates. See our disclaimer.