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MS2® 2" Deep Mechanically Seamed
Single Lock or Double Lock


MS2® 2” Deep MECHANICALLY SEAMED

SINGLE LOCK OR DOUBLE LOCK

Mechanically fastened standing seam metal roofing can be mechanically seamed to either a single lock or a double lock condition. The most commonly used mechanical standing seam panel is the double lock system. MS2 with a double lock seam condition can handle low slope roof greater than 1” in 12”. If you have a slope that is greater than 1:12 and less than 3:12 this would be an excellent concealed fastened roof panel. The single locking condition is not as commonly used as the double locking condition and used on a 3/12 or greater slope roof. The MS2 is a better fit amongst all hidden fastened metal panels for roof slopes less than 3:12. You will need to rent a seaming tool. MS2 comes with clip relief ribs. Striations or stiffening ribs can be added to the panel to lessen the chance of oil canning.

WHAT IS A MECHANICALLY SEAMED CONCEALED FASTENED PANEL?

Mechanically seamed panels are roll formed with specific edges that line up with each other. Once the two panels are engaged, a hand or mechanical seamer is used to bend the edges and lock the panels together. There are two different versions of mechanical seams: Single lock 90-degree seams and double lock 180-degree seams.

Single Lock (90-degree seam) Quick Facts

  • Single lock refers to ONE fold of the seam (or 90 degrees).
  • While single lock profiles won’t perform as well as a double lock, single lock still performs well in milder environments. Again, check to make sure the engineering allows a single lock to be used.
  • Single locked systems require less labor, and it’s easier to replace a damaged panel than double lock profiles.

Double Lock (180-degree seam) Quick Facts

  • Double lock mechanical systems feature TWO folds of the seam (to achieve 180 degrees).
  • Double lock systems are suitable for low-slope applications needing extra weather-tightness.
    • 2-inch double lock profile: Can generally be installed down to a .5/12 pitch with in-seam sealant (based on geography).
    • 1.5-inch double lock profile: Can generally be used down to a 1/12 pitch with in-seam sealant (based on geography).
  • Double lock panels perform better; plus, there is less of a chance for panels to come un-seamed.
  • For properties in cold weather areas with freezing and thawing, double lock systems are good choices. As snow/ice freezes and thaws, it also expands and contracts, which could potentially disengage a snap-lock profile.
  • Double lock panels are more labor-intensive to replace.
  • When possible, you should use an expansion clip with a mechanical lock profile.

More Options for Standing Seam Systems

Striations or Stiffening Ribs

Striations, also called stiffening ribs or rib rollers, are the “patterns” roll formed into a metal roofing panel between the seams. These can be used to assist with the installation of a metal roof, to help reduce the visibility of oil canning, or just for curb appeal. In fact, we recommend using striations in standing seam panels, some available options include:
  • Flat – No indents between the clip relief ribs
  • Striated – Small consistent indentation lines in the panel
  • Ribbed – Shapes or indentations between the seams
    • Pencil – Circular panel indents
    • V-Ribs – “V” shaped panel indents
    • Bead – Longer, rectangular panel indents
  • Clip relief – A stiffening rib adjacent to the seam that allows the space for a clip underneath

ORDERING INFORMATION

Excellent customer service is important to us. When you place your order with Western States Metal Roofing you can expect the following:

    • Knowledgeable Sales Associates - Helpful and friendly sales associates that will answer all of your questions.
    • Made to Order Panels - We cut your metal roofing and metal siding panels to the exact lengths needed.
    • Fast Turnaround - Typical two week lead time. However, if you need it quicker, we normally can accommodate just about any completion schedule.
    • Shipping Convenience - We have route trucks that service anywhere in the USA and Canada.
    • Affordable Shipping - Immediate and inexpensive shipping.

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