Reroofing is not required to meet the minimum design slope for roofs providing positive roof drainage if it meets which slope requirement?

Reroofing does not have to meet the minimum design slope for roofs providing positive drainage if the slope is at least 1/4:12. This particular slope ensures that water drains efficiently off the roof surface, preventing potential issues such as water pooling and leaks.

In roofing terminology, a slope of 1/4:12 means that for every 12 horizontal inches, the roof rises a minimum of 1/4 inches. This slight incline is sufficient to facilitate effective drainage. As long as the roof maintains this slope or steeper, it can adequately manage water runoff, thereby allowing existing roofs to remain as they are when reroofing occurs.

Higher slope requirements, while they enhance drainage efficiency further, are not necessary for the condition to be met if the roof already has a minimum slope of 1/4:12 during reroofing.