A flat or low-slope roof replacement in Dallas commonly costs $6 to $12 per square foot installed, so a 1,500-square-foot flat section typically runs $9,000 to $18,000, with TPO and modified bitumen in the middle of that range and full tear-off with new tapered insulation at the top. Repairs to seams and flashings are often a few hundred dollars, and a silicone or acrylic coating system over a sound membrane commonly runs $3 to $6 per square foot. Texas heat is the biggest factor in both cost and material choice: reflective white membranes cost a bit more and last much longer here.
Typical Dallas flat roof prices
TPO single-ply, mechanically attached or adhered: commonly $7 to $12 per square foot installed over a sound deck, including new cover board and flashings. White TPO is the most common choice on new DFW flat roofs.
Modified bitumen (torch-down or self-adhered): commonly $6 to $10 per square foot. Often used on mid-century Dallas homes and additions. Add a reflective coating for heat.
EPDM rubber: commonly $5 to $9 per square foot. Lowest material cost, but the black surface runs hot in Texas summers.
Coating systems (silicone or acrylic) over an existing sound membrane: commonly $3 to $6 per square foot. Extends life 10 or more years when the insulation underneath is dry.
Repairs: seam, flashing, and puncture repairs often $300 to $1,500. Ponding correction with tapered insulation is priced with a replacement.
What drives the price up on Texas flat roofs
Wet insulation. If the old roof leaked long enough, the insulation is saturated and must be replaced. A moisture scan or core samples before quoting tells you how much. This is the biggest cost surprise on DFW flat roofs.
Drainage. Ponding water is the main killer of flat roofs, and fixing it means tapered insulation or new drains and scuppers. It adds cost but is the difference between a 10-year and a 25-year roof.
Penetrations and details. HVAC curbs, plumbing vents, skylights, and parapet walls all need custom flashing. A roof with many penetrations costs more per square foot than a clean one.
Tear-off vs. overlay. Some flat roofs can accept a new membrane over the old one if it's dry and the code allows it. Tear-off costs more but avoids trapping moisture.
Choosing a flat roofer in DFW
Ask what membrane they install most and see local flat roofs they did more than five years ago. Ask whether they own a heat welder for TPO or rely on adhesives. Ask how they'll address ponding.
Get a written scope: membrane brand and thickness, insulation type and R-value, tapered plan if any, flashing details, drains, and both warranties.
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