What fails first in a Garland house built between 1960 and 1990?
The drain line, more often than the supply. Many Texas slab houses of that era were plumbed with cast-iron drains run under the slab, and cast iron corrodes from the inside as the decades pass. A pinhole or a cracked hub does not spray; it seeps, so the floor above it dampens slowly and the first sign is a smell or a tile that has come loose.
The second candidate is the water heater. In slab houses the tank often sits in a garage, a closet or the attic, and when it finally goes it empties where it stands. A tank in the attic soaks ceiling drywall and insulation on the way down; one in the garage sends water along the slab toward the house. Cleanup for one area is estimated at $800–$3,000, with the plumber's replacement not included.
In houses built from the late 1970s into the mid-1990s, supply lines may be polybutylene, which is a known failure risk, and Garland's newest tract housing falls inside that window. If you do not know what you have, that is a question for a licensed plumber rather than a reason to open a wall.
Where does heavy rain put water in Garland?
On the ground floor, because there is almost nowhere else for it to go. Dallas-area houses rarely have basements, so when a street or a yard takes more water than the drains can carry, it comes over the threshold and onto a slab. The August 22, 2022 storm that dropped 9.19 inches at DFW Airport in 24 hours put about 12.60 inches on Balch Springs and 15.31 inches on southeast Dallas, both south of here.
Street water is Category 3 under the IICRC S500 standard, grossly contaminated, so the work is removal before drying. Carpet and pad come out, wet drywall is cut back two to four feet at an estimated $3–$8 per linear foot of wall, and what stays gets an antimicrobial. Slab-on-grade flood mitigation for a first floor is estimated at $3,000–$12,000.
Flood is also the coverage gap. A standard Texas homeowners policy does not cover rising surface water; that needs a separate policy through FEMA's National Flood Insurance Program or a private insurer, and an NFIP policy generally takes 30 days to begin. Check before the next spring storm season rather than during it.
Why do Garland roofs leak weeks after a storm?
Because hail damages shingles without opening them. A bruised or cracked shingle keeps water out for a while, then fails in the next long rain. The October 20, 2019 EF3 tornado that crossed parts of Garland after running through northeast Dallas and Richardson is the loudest example, but the hail seasons in between do quieter damage to the same roofs.
Inside, the water follows the easiest path along a rafter or a truss, so the stain often appears well away from the hole. Textured drywall ceilings stain and sag quickly once wet, and a sagging ceiling is a safety problem: stay out from under it, and do not poke it to drain it unless you have somewhere for that water to land.
Emergency tarping is estimated at $250–$1,200 and ceiling repair for one section at $450–$1,800. The guide on hail roof leaks in Dallas explains the photos to take and the separate wind and hail deductible many Texas policies carry.
What should you do in the first hour, and who handles what?
Shut the water off at the main. In many Garland houses that valve is in the street-side meter box, and a meter key costs a few dollars and saves a flooded hallway; some houses have a second valve at the house or garage wall. Stay out of standing water near outlets and appliances.
Then photograph the damage and call your insurer, and leave the wet materials where they are until someone has seen them. A technician checks for hidden moisture with meters and thermal tools, sets air movers and dehumidifiers, re-checks until the readings are dry, and can give you those readings and photos for your claim. Your insurer decides coverage under your policy.
Garland is its own city, so the repair stage follows Garland's permits rather than Dallas's; ask your contractor which ones apply to drywall, flooring or framing. The pipe, the slab leak and the water heater go to a Texas-licensed plumber, foundation leveling is a foundation company's work, and the crew dries and cleans what the water reached. Call (833) 490-5225 at any hour.
