Roofs and Roofing (22) Flashcards
What is a “Roof”?
A roof is a part of the building envelope that is angled to collect and redistribute precipitation, and it provides the highest levels of thermal control.
What is the difference between Low-Slope and High-Slope roofs?
High-Slope roofs have a slope greater than 2:12 (9 degrees), while Low-Slope roofs have a slope of 2:12 (9 degrees) or less, but must have at least a 0.25:12 (1.15 degrees) slope to prevent ponding.
What is a “Structural Roof Deck”?
The structural roof deck bears the load of any precipitation or people that the roof is expected to carry.
What are “Air and Vapor Barriers”?
Air and vapor barriers are placed on the “warm side” of the insulation to prevent condensation within the roof assembly.
What is “Thermal Insulation” in the context of roofs?
Thermal insulation in roofs typically consists of sheets of rigid insulation that can carry load without being crushed, helping to maintain thermal control.
What is a “Roof Membrane”?
A roof membrane is the primary waterproof layer of a roof, protecting the building from water infiltration.
What is “Ballast” in roofing?
Ballast is a loose layer of gravel that holds down the roof membrane and shields it from solar radiation and physical damage.
What is a “Curb” in roofing?
A curb is built up several inches above the roof membrane to keep water on the membrane and is waterproofed and flashed to channel water back onto the membrane.
What is a “Scupper”?
A scupper is an opening in the side of a building that allows water to drain off the roof.
What is “Thatching”?
Thatching is a cladding system for steep roofs that uses bundles of reed-like materials to shed water and provide insulation.
What is “Shingling”?
Shingling covers the drainage plane with small overlapping elements that channel water over their surfaces until it reaches a roof edge.
What is “Sheeting” in roofing?
Sheeting covers the drainage plane with continuous sheets of material that channel water over its surface until it reaches a roof edge or gutter.
What is “Flashing” in roofing?
Flashing is used at changes in slope and in valleys to channel water down to the roof’s bottom edge, preventing water infiltration.
What are “Ice Dams”?
Ice dams form when snow melts higher up on a roof and refreezes at the eaves, causing water to pond and potentially damage shingled cladding.
