What is the minimum slope required for asphalt shingle roofs?

The minimum slope required for asphalt shingle roofs is typically 2 1/2 in 12. This slope is important because it ensures proper drainage of water off the roof, minimizing the chances of water pooling, which can lead to leaks and damage over time. A slope of 2 1/2 in 12 means that for every 12 horizontal inches, the roof rises 2 1/2 inches.

This slope is considered the minimum for asphalt shingles, as it allows for effective runoff while still accommodating standard installation practices. Sufficient slope optimizes the performance and longevity of the roofing material, which is why building codes often specify this as a baseline requirement. A roof slope steeper than this can increase drainage efficiency, while a level slope could lead to significant problems associated with water retention.