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What Is the Minimum Slope for Flat Roofs?

Flat roofs are a common architecture feature in homes of all styles. From a simple lean-to to a multi-million dollar mansion a flat roof is attractive and functional. Flat roofs are easier to install, cost less, and have fewer maintenance problems.

  1. No Flat Roofs

    • Technically, very few roofs are actually flat. The greatest problem with a completely flat roof is drainage. Water puddles on the roof, which increases the risk of a leak developing. Snow stays on a flat roof longer because it has no way to slide off.

    Low-Slope Roof

    • The flat roof look is achieved with what is called a low-slope roof. According to the American Society for Testing and Materials Standard E 1918-97, a low-slope roof has a maximum slope of 2 inches "rise" for 12 inches "run."

    Example of Rise

    • A low-slope roof that is 30 feet long would be 60 inches taller at the peak than the bottom edge of the roof. This allows proper drainage.

    Hiring a Contractor

    • Flat roofs are more complex for waterproofing. Carefully check a builder's credentials, understanding of flat roof design and experience installing them.

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Architecture
  1. What Is a Colonial Roof?
  2. Typical Roof Slope
  3. What Is the Minimum Pitch for a Lean-To Roof?
  4. What Is the Minimum Slope for an Interior Sewer Pipe?
  5. What Is the Purpose of Gravel on a Flat Roof?
  6. What Is the Roof Pitch for a Ranch House?
  7. What Is the Minimum Pitch for a Tiled Roof?
  8. What Is the Standard Slope of a Roof?
  9. The Proper Slope for the Roof
  10. What Is the Minimum Slope of a Roof?
  11. What Is the Pitch for a Drain?
  12. What Is a 2/12 Roof Slope?

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