Standingseam

Standing seam is a metal roofing profile characterized by vertical legs and a raised seam that interlocks adjacent panels. The seam runs along the length of the roof, creating a continuous, weather-tight surface with concealed fasteners. Panels are typically installed from eave to ridge and are designed to shed water along the seam.

Common materials for standing seam include steel (often galvanized or coated), aluminum, copper, and zinc. Finishes such as PVDF coatings or polymer paints provide color and durability. Panel gauges vary, but steel systems commonly use around 24–26 gauge. Seams can be mechanically formed or snap-locked, with many systems employing concealed clip systems to allow for thermal movement.

Construction and installation involve attaching panels to a prepared roof deck or substrate using concealed fasteners or clips. Two primary seam types are used: mechanically seamed panels, which are formed with seamers to lock the interlocking seam, and snap-lock (concealed-fastener) systems that lock without exposed screws. Standing seam roofs are generally suitable for a range of roof pitches, commonly down to about 1:12, though some products allow lower slopes with proper detailing. Proper installation emphasizes seam integrity, drainage, and ventilation.

Advantages include high weather resistance, wind uplift performance, minimal penetrations, long service life, and design versatility in color and finish. Disadvantages can include higher material and installation costs, and the need for skilled labor for installation and occasional seam inspection. Standing seam is widely used in commercial and institutional buildings and is also found in some residential applications where a sleek, durable metal roof is desired.