What is the minimum slope that metal roof shingles must have?

Metal roof shingles typically require a minimum slope of 3 units in 12 to ensure proper drainage and to minimize the risk of water infiltration. A slope of 3:12 means that for every 12 horizontal units, the roof rises 3 vertical units. This particular slope is generally recognized as adequate for allowing water to effectively run off and preventing issues like ponding or leakage, which can lead to premature failure of the roofing system.

While lower slopes can be used for some roofing materials, metal shingles specifically benefit from this steeper incline due to their design and the way metal surfaces shed water. A slope lower than 3:12 increases the likelihood of water retaining on the surface, which could compromise the integrity of the roofing system and lead to moisture-related problems.

It's important to adhere to manufacturer recommendations and local building codes, which often dictate minimum slope requirements for different roofing materials to ensure safety and performance in various weather conditions.