Under NYS Rule Code 56-7.11, seams between adjacent layers must be staggered by at least how many inches?

• A. 12 inches
• B. 24 inches
• C. 36 inches
• D. 48 inches

Answer: (B)

The main idea here is to avoid having joints line up between layers. By staggering the seams between adjacent layers by at least twenty-four inches, you disrupt a single path through multiple layers and reduce the risk of a weak point where fibers could escape or the coating could fail. In practice, when applying a second layer, place its joints so they do not align with the joints of the first layer by a minimum of twenty-four inches. This offset is a practical balance that maintains safety and structural integrity without being overly restrictive. Smaller offsets, like twelve inches, leave a greater chance for seams to align; larger offsets are more demanding for crews and materials. So, twenty-four inches is the standard minimum.