Scupper
Definition
A scupper is an essential architectural drainage element designed to provide an outlet for water to flow off a flat or low-slope roof, typically through a parapet wall or gravel stop. By creating a strategic opening in the building's exterior envelope, it prevents the accumulation of standing water, which can lead to leaks, structural damage, or even roof collapse. Scuppers can function as primary drainage or as overflow backups, often directing water into conductor heads, gutters, or downspouts to guide it safely away from the building's foundation. While primarily functional, they can also be decorative features, such as the elaborate gargoyles of Gothic architecture or simpler "lamb's tongue" projections, and are commonly fabricated from durable materials like copper, stainless steel, or masonry.
Structural & construction notes
Common types of scuppers include through-wall scuppers that pass through parapet walls, channel or open-top scuppers that resemble three-sided troughs, and overflow scuppers which serve as a secondary emergency drainage system. Other variations include decorative versions like gargoyles or traditional southwestern canales, and those featuring specific spout shapes such as the tapered lamb's tongue. Common materials include copper, aluminum, stainless steel, galvanized steel, and PVC. High-durability metals like copper and stainless steel have higher initial costs but offer superior longevity and rust resistance, while aluminum and galvanized steel provide a balance of corrosion resistance and affordability. PVC or plastic options are the most budget-friendly but may require earlier replacement due to lower durability in extreme weather.
Frequently Asked Questions
An educational reference. Project-specific design requires professional guidance.