Mechanical Lock Standing Seam Panels
The most widely used, traditional metal roof system, the mechanical lock, also commonly referred to as just standing seam roof, can be installed as a single lock or double lock system.
This profile panel is available in 1” or 1.5” high standing seam. The double lock has long been considered the best locking system available and is it not uncommon to find century old systems still functioning properly. Commonly used materials are copper, lead coated copper, freedom gray, zinc, and Kynar coated steel and aluminum.
Copper based systems offer the advantage of being able to be soldered where needed, where aluminum systems are easier to work with and more malleable, while Kynar steel systems are a more tough panel, although not recommended for installations near the ocean.
These panels are secured to the roof deck via roof clips and can be curved.
Snap Lock Standing Seam Roof Panels
The Snap Lock seam is offered in 1” and 1.5” high seams. This system snaps together as the panels are installed. Snap Lock eliminates the need to mechanically lock the seams together, allowing for a much faster installation, much easier for those looking for a DIY project. Snap Lock also incorporates fixed or expansion cleats that allow the panel to expand and contract. Snap lock panels cannot be curved.
Because this system relies on the rigidity of the material used, softer materials such as copper are not recommended.
Nail Strip Standing Seam Roof Panels
The Nail Strip Lock system is offered in 1” and 1.5” high seams. This system snaps together just like a Snap Lock system and has a hidden built –in nail strip that eliminates the need for cleats. This is an economical system, very quick to install, ideal for short runs where expansion and contraction are not a concern.
As the snap lock system, this system relies on the rigidity of the material used, therefore softer materials such as copper are not recommended.
Standing U Seam Metal Roof Panels
The U-Panel is offered in 1” or 1.5” seam heights. U-Panels can be used in conjunction with heavy-duty batten cleats to form Batten Lock Panels.
Batten Cleats are installed between each panel. A batten cap is then snapped into place over the cleat. This eliminates the need for installing wood battens.
Flat Locked Roof and Wall Panels
Flat-Lock roofing panels come in a variety of shapes, sizes and metals. These panels are ideal for flat roofs, domes, turrets and any wall panel system – interior or exterior. Metal clips and nails for fastening the panels are available. Pre-Tinning of edges is also available.
Flat lock panels always need to be soldered on flat roofs. The the exception lies with vertical applications (walls). That means colored materials like Kynar aluminum and steel can only be use on walls.
Normally, to keep costs down, flat locked panels are made with dimensions that get an even number of panels out of a sheet or coil.
For example, if using copper sheets 3'x10', it is common to cut panels with 18" x 24", where 10 panels are extracted from every sheet.
The lock size varies, but it is commonly 0.5"-0.75".
Flat locked panels are commonly used with zinc for wall applications, with more of a diamond shape.
The ideal coil sizes are the ones sold as standard by the mill. These are normally slit from a 48" master coil, but sometimes 60".
Copper: 24", 20" and 18" wide. 15" and 12" can also be used since they are sold as standard for gutters. 16oz and 20oz.
Freedom Gray: 24", 20" and 18" wide. 16oz and 20oz.
Galvalume Plus, Kynar Steel (Galvanized) and Kynar Aluminum: 24", 20", 18" and 16" wide. 0.032", 0.040", 24 and 22 gauge.
Lead Coated Copper: 24", 20" and 18" wide. 16oz and 20oz.
Zinc: 0.7mm and 0.8mm 19.7" wide.
The pictures below are courtesy of The Century Slate Roofing Company.