What is an acceptable slope for a low slope roof according to safety standards?

An acceptable slope for a low slope roof is defined as less than or equal to a ratio of 4:12. This means that for every 12 horizontal inches, the roof can rise no more than 4 vertical inches. Roofs with this slope are considered low slope roofs and are typically classified as such for safety and design purposes.

Low slope roofs are often designed to allow for adequate drainage while minimizing the risk of water pooling, which can lead to leaks and structural problems over time. The 4:12 slope is a widely accepted standard because it balances the need for drainage with the ease of construction and provides a manageable slope for installation and maintenance.

In contrast, slopes greater than 4:12 are categorized as steep slopes, which require different safety precautions and construction techniques. The other options suggest either too steep or no slope at all, which would not conform to the safety and structural standards necessary for effective roof performance.