TPO & Modified Bitumen Flat Roofing Done Right
Additions, porches, outbuildings, and commercial low-slope roofs all need a different approach than a standard sloped shingle roof. We install and repair flat roofing systems built to actually drain and hold up.
Where Flat Roofing Fits
Very few Dallas homes are fully flat-roofed, but plenty have a flat or low-slope section that needs its own roofing approach — a porch, addition, garage, or bay window roof — and we see it constantly around West Dallas's mix of older homes and newer additions:
- TPO membrane — a reflective, heat-welded single-ply system, the most common choice for flat/low-slope roofs today.
- Modified bitumen — a multi-layer asphalt-based system, a solid fit for certain existing roof assemblies.
- Proper drainage detail — the single most important factor in how long a flat roof actually lasts, regardless of membrane type.
2026 Flat Roof Cost Range
As a rough planning figure, TPO installation typically runs $4.00–$10.00 per square foot depending on membrane thickness, insulation, and drainage work needed. We'll give you an exact written number after seeing the actual roof — flat roof pricing depends heavily on existing deck condition and drainage setup.
Request a Free EstimateComparing Flat Roofing to Other Systems
Commercial Roofing
TPO and low-slope systems for business properties.
Learn more about Commercial RoofingFlat Roofing Questions
What is TPO roofing, exactly?
TPO (thermoplastic polyolefin) is a single-ply white or gray membrane heat-welded at the seams, commonly used on flat and low-slope roofs. It's reflective, resists UV and ponding water well, and is one of the most widely used commercial and low-slope residential materials today.
How long does a TPO roof last?
Typically 20-30 years with proper installation and maintenance, depending on membrane thickness and how well the roof drains.
What's the difference between TPO and modified bitumen?
TPO is a single-ply reflective membrane; modified bitumen is a multi-layer asphalt-based system, often torch- or heat-applied. Both work well on flat/low-slope roofs — the right choice depends on the specific structure, budget, and existing roof assembly.
Do flat roofs really need more maintenance than sloped roofs?
They need different maintenance, mainly around drainage — flat and low-slope roofs are more prone to ponding water if drains or scuppers get clogged, so periodic checks matter more than on a steep sloped roof.
Have a Flat or Low-Slope Section That Needs Attention?
Free estimate, no pressure. We serve Dallas 75208, Oak Cliff, and West Dallas.