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What is the minimum slope for rolled roofing as defined by IBC?

  1. 1:6

  2. 1:8

  3. 1:10

  4. 1:12

The correct answer is: 1:12

The International Building Code (IBC) specifies that the minimum slope for rolled roofing is 1:12. This means that for every 12 horizontal units, there should be a vertical rise of at least 1 unit. Maintaining this minimum slope is crucial as it facilitates proper drainage, minimizes water pooling, and reduces the risk of leaks or damage to the roofing system. Using the correct slope helps ensure that water flows off the roof effectively, which is particularly important for flat or low-slope applications typically associated with rolled roofing materials. A slope of less than 1:12 may not provide adequate drainage, increasing the likelihood of complications such as membrane failure and subsequent leaks.