Flat Roof Repair in Houston, TX
Ponding water, split seams, failed drains and curbs. Low-slope repair done to the membrane's spec, not patched with roofing cement.
Flat roofs in Houston deal with something steep roofs never face: standing water. Our rainfall intensity overwhelms undersized drains, and a low spot that holds water for more than 48 hours degrades any membrane system — TPO, EPDM, modified bitumen, or built-up.
Repairs have to match the membrane. Roofing cement smeared over a TPO seam fails within a season and contaminates the surface so the correct heat-weld repair costs more later. We identify the system first and repair to its spec.
Houston Flat Roof Repair Costs
| Service | Typical Cost | Timeline |
|---|---|---|
| Seam repair (TPO heat weld) | $350–$1,100 | 1 day |
| EPDM patch and seam tape | $300–$950 | 1 day |
| Modified bitumen torch patch | $400–$1,300 | 1 day |
| Drain or scupper reflashing | $450–$1,500 | 1 day |
| Curb and penetration flashing | $400–$1,200 | 1 day |
| Ponding correction (tapered insulation) | $6–$14 per sq ft | 2–4 days |
Ponding correction is the one flat-roof item that is genuinely expensive, because it means rebuilding slope with tapered insulation rather than patching a symptom.
Why Houston Flat Roofs Fail
- Ponding water. Anything still holding water 48 hours after rain is a defect. Standing water accelerates UV breakdown, adds structural load, and finds any pinhole in the membrane.
- Seam failure. Seams are the weak line on every single-ply system. Heat, movement, and foot traffic open them, and water travels laterally under the membrane before it shows inside.
- Penetration curbs. HVAC curbs, vents, and conduit are the most common leak sources on Houston commercial roofs — the flashing gets damaged by service techs walking the roof.
- Undersized or clogged drains. Houston downpours exceed design capacity on older buildings. Blocked drains turn a rainstorm into a load-bearing problem.
How We Repair Low-Slope Roofs
- Identify the membrane system and its age before proposing any repair method.
- Locate water entry with a walk of seams, curbs, drains, and terminations — plus moisture probing where needed.
- Repair to the manufacturer's method for that membrane, not a generic patch.
- Document with photos and advise on drainage corrections that prevent repeat failures.
Why Homeowners Call Us
- GAF Master Elite® certified
- Registered & insured, based in Katy and serving the full Houston metro
- Free inspections with photo documentation and a fixed written price
- Workmanship warranty on every repair we perform
- We tell you when a repair will do — we do not upsell replacements
Related Pages
We serve the entire Houston metro — from Montgomery County to Galveston, Brazoria, Wharton, and Fort Bend County. See our full service area list.
Flat Roof Leaking? Get a Membrane-Specific Diagnosis.
Free inspection of seams, curbs, and drains with a fixed written repair price.
Call 713-489-4265