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In construction, a “cant strip” refers to a wedge-shaped strip of material, typically made of wood, plastic, or metal, used to create a smooth transition between horizontal and vertical surfaces, particularly in roofing applications. The term “cant” originates from the French word “chanter,” meaning “to sing,” and in construction, it refers to a beveled or sloped edge.

The primary purpose of a cant strip is to prevent sharp angles and create a gradual slope or transition between different roofing components, such as where a flat roof meets a parapet wall or where two roof surfaces intersect at different angles. By providing a gradual slope, cant strips help to redirect water away from vulnerable areas, such as corners and joints, reducing the risk of water infiltration and potential damage to the roofing system.

Cant strips are commonly installed along the perimeter of flat or low-slope roofs to facilitate proper drainage and prevent ponding water. They are typically positioned beneath the roofing membrane or flashing materials to provide support and create a smooth transition between the roof surface and vertical walls or penetrations.

The installation of cant strips requires careful attention to detail to ensure proper alignment and slope. They are often secured in place using adhesives, fasteners, or roofing cement, depending on the specific application and roofing materials used. Additionally, cant strips may be fabricated on-site or prefabricated to specific dimensions and angles to suit the project requirements.

Some key benefits of using cant strips in roofing applications include:

1. Water Drainage: Cant strips promote effective water drainage by preventing water from pooling in low spots and directing it towards drainage points or gutters.

2. Reduced Stress: By eliminating sharp angles and providing a gradual slope, cant strips help reduce stress and tension on roofing materials, minimizing the risk of damage and prolonging the lifespan of the roof.

3. Improved Aesthetics: Cant strips create a clean and professional finish by smoothing transitions between different roof surfaces, enhancing the overall appearance of the roofing system.

In summary, cant strips play a crucial role in roofing construction by facilitating proper drainage, reducing stress on roofing materials, and enhancing the overall performance and longevity of the roof.

During the installation of the flat roof system, the roofing contractor placed cant strips along the perimeter to ensure optimal water drainage.

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