When it comes to commercial roofing, one of the biggest decisions business owners face is whether to install a flat or sloped roof. Both options have unique advantages, costs, and maintenance considerations. At 360 Builders, we’ve helped countless businesses in Sioux Falls and surrounding areas choose the right roof for their building. In this guide, we’ll break down the differences to help you make an informed choice.
What Is a Flat Roof?
A flat roof is exactly what it sounds like—a roof with minimal slope, usually less than 10 degrees. These roofs are commonly found on commercial buildings, warehouses, and retail spaces. Common materials include:
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TPO (Thermoplastic Polyolefin)
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EPDM (Ethylene Propylene Diene Monomer)
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Modified bitumen
Benefits of a flat roof for your business:
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Cost-effective installation: Flat roofs generally require fewer materials and labor, making them more affordable upfront.
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Easy maintenance and access: Walkable surfaces make inspections, repairs, and rooftop equipment installation simpler.
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Extra usable space: Flat roofs can accommodate HVAC units, solar panels, or even rooftop seating areas.
Drawbacks:
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Drainage concerns: Flat roofs require proper design to avoid water pooling.
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Shorter lifespan in some climates: Extreme snow or ice accumulation can reduce longevity if not maintained.
What Is a Sloped Roof?
A sloped roof has a noticeable pitch, which helps water and snow drain naturally. Sloped roofs are common on commercial buildings, offices, and mixed-use developments. Materials often used include:
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Metal roofing
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Asphalt shingles
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Tile or composite materials
Benefits of a sloped roof:
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Better drainage: The natural slope prevents water pooling and reduces leak risk.
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Longer lifespan: Sloped roofs can last 25–40+ years with proper care.
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Aesthetic appeal: Sloped roofs give buildings a polished, professional look.
Drawbacks:
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Higher installation costs: More materials and labor are required.
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Complex repairs: Steeper slopes make inspections and repairs more challenging.
Key Factors to Consider for Your Business
When deciding between flat vs sloped roofs for commercial buildings, keep these factors in mind:
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Climate and Weather: In Midwest winters, snow accumulation can impact flat roofs more than sloped roofs. Proper drainage and materials are essential.
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Building Size and Structure: Large, single-story buildings often benefit from flat roofs, while smaller or multi-story structures may work better with sloped roofs.
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Budget Considerations: Consider both installation costs and long-term maintenance expenses.
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Future Needs: Think about rooftop equipment, solar panels, or potential building expansions.
Flat vs. Sloped Roof: Quick Comparison
| Feature | Flat Roof | Sloped Roof |
|---|---|---|
| Cost | Lower | Higher |
| Lifespan | 15–25 years | 25–40+ years |
| Maintenance | Easier access | More complex |
| Drainage | Needs design | Naturally drains |
Which Roof Is Right for Your Business?
There’s no one-size-fits-all answer. Both flat and sloped roofs have unique advantages, and the best choice depends on your building type, budget, and long-term goals.
Our team can help you weigh the pros and cons and select the roof that protects your investment for years to come.
📞 Ready to make the right roofing choice? Contact us today for a free consultation!