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WHAT TO KNOW ABOUT FLAT ROOF DRAINAGE
Contrary to popular belief, flat roofs are not completely level. They are designed with a slight slope to facilitate water drainage. Understanding this fundamental aspect is key to comprehending how flat roofs drain and why proper drainage systems are vital. The primary objective of any flat roof drainage system is to remove water as efficiently as possible This involves strategically placed drains and a well-thought-out design to prevent water accumulation, which can lead to leaks and structural damage.
When it comes to flat roofs, proper drainage is essential to ensure the longevity and performance of the roof. Flat roof drainage systems are designed to collect and channel water away from the roof’s surface, preventing water accumulation and potential damage.
UNDERSTANDING FLAT ROOF DRAINAGE
Flat roofs typically have three main options for drainage: scuppers, roof overflow drains, and roof drains. The choice of a drainage system depends on various factors such as roof design, building structure, and local building codes.
Inner Drains
Inner drains are installed away from the edges of the roof, typically at the lowest point where water is likely to collect. They are connected to pipes beneath the roof that channel water away from the building. This system is advantageous in colder climates as the internal placement of the pipes reduces the risk of freezing.
SCUPPER DRAINAGE
Scuppers are openings or channels located at the low points of a flat roof. They allow water to drain off the roof and into the downspouts and gutters. Scuppers are often paired with overflow drains to prevent water from accumulating and causing damage to the roof. Proper maintenance of scuppers is crucial to ensure their effectiveness in draining water.
Scuppers are openings in the parapet walls that allow water to drain off the sides of the building. They are effective in quickly removing water, especially in areas with heavy rainfall. However, they require regular maintenance to prevent blockages and ensure efficient water flow.
ROOF OVERFLOW DRAINS
Roof overflow drains serve as secondary drainage systems. They are typically installed alongside scuppers to handle excessive water during heavy rainfalls. Overflow drains help prevent water from backing up on the roof, reducing the risk of leaks and structural damage. These drains are usually connected to the building’s plumbing system or directed to a separate drainage area.
ROOF DECK SLOPE
The slope of the roof deck plays a significant role in determining how effective a flat roof will be at drainage. It refers to the intentional angle or slope built into the roof deck to facilitate water runoff. The roof deck slope can be achieved through tapered insulation or structural modifications. In cases where the slope is insufficient, adjustments may be necessary to improve drainage.
ROOF DRAIN SYSTEM
Roof drains are common on flat roofs where water needs to be channeled to a specific location. These drains are positioned in low areas on the roof and are connected to a plumbing system or underground drainage. Proper installation and maintenance of roof drains are vital to ensure efficient water flow and prevent blockages.
ROOF GUTTER DRAINAGE SYSTEM
Gutters are installed along the roof edges and direct water into downspouts. While they are a cost-effective solution for smaller buildings, gutters need frequent cleaning to prevent clogs from debris like leaves and twigs. In some cases, flat roofs may incorporate a traditional gutter system for drainage. Gutters are installed along the roof’s edges, collecting water and directing it to downspouts. The downspouts then carry the water from the gutter down to the ground or a designated drainage area. This gutter system is commonly used when the flat roof is part of a larger building structure with sloped roofs that already have gutters in place. It provides an effective way to channel water away from the flat roof surface.
SIPHONIC ROOF DRAINS
A siphonic roof drain system uses a vacuum mechanism to draw water from the roof at high speeds. It is an ideal choice for large commercial buildings with extensive roof areas.
TAPERED INSULATION
Tapered insulation helps create a slope on flat roofs, enhancing drainage. It is an effective solution for addressing areas prone to water pooling and also improves the building’s thermal efficiency.
ROOF CRICKETS
Roof crickets, also known as saddles, are structures built on the roof to divert water away from a specific area. They are typically used on larger flat roofs where water pooling or accumulation is a concern. Roof crickets are triangular in shape and installed on the upslope side of obstacles such as chimneys or vents. They help redirect water around these obstacles and promote proper drainage.
CALL OR EMAIL US TODAY FOR YOUR FREE ESTIMATE – 202-276-5004 FAMILY.ROOFING@YAHOO.COM
Flat roofs typically have three main options for drainage: scuppers, roof overflow drains, and roof drains. The choice of a drainage system depends on various factors such as roof design, building structure, and local building codes.
Roof drains are common on flat roofs where water needs to be channeled to a specific location. These drains are positioned in low areas on the roof and are connected to a plumbing system or underground drainage. Proper installation and maintenance of roof drains are vital to ensure efficient water flow and prevent blockages.