Which term describes a second roof over an existing roof, often used in colder climates to add insulation?

• A. Ridge
• B. Purlin
• C. Solid-Core Door
• D. Rain or Snow Roof

Answer: (D)

Adding a second roof over an existing one is a weatherproofing strategy used to boost insulation in colder climates. By installing a separate outer layer, you create an extra barrier against heat loss and moisture, helping keep the interior warmer and reducing energy needs. This setup can also aid in snow and rain management by providing an additional surface for shedding precipitation. The other options aren’t about a second roof: a ridge is just the top edge where roof planes meet, a purlin is a horizontal structural member in the roof frame, and a solid-core door is a doorway, not part of roofing.