In a two-plane cladding system, what is the purpose of the two planes?

In a two-plane cladding system, what is the purpose of the two planes?

• A. First plane prevents most rain and snow entering with trim and cladding
• B. Second plane intercepts rest of rain and snow and dissipates to exterior
• C. Both A and B
• D. Neither

Answer: (C)

In a two-plane cladding system, moisture management happens in two stages. The outer layer—the cladding with its trim—acts as the first barrier, shedding most rain and snow away from the wall. Even with that protection, some water can get behind the cladding, so a second plane behind it provides a drainage and ventilation gap. This interior plane intercepts the remaining moisture and channels it to the exterior, while also allowing air to flow and help dry the cavity. Together, these two planes reduce water entry and promote drying, which is why both functions are part of the system.

In a two-plane cladding system, moisture management happens in two stages. The outer layer—the cladding with its trim—acts as the first barrier, shedding most rain and snow away from the wall. Even with that protection, some water can get behind the cladding, so a second plane behind it provides a drainage and ventilation gap. This interior plane intercepts the remaining moisture and channels it to the exterior, while also allowing air to flow and help dry the cavity. Together, these two planes reduce water entry and promote drying, which is why both functions are part of the system.