What it is
Standing seam is a metal roof made of long vertical panels whose edges turn up and lock together. The fasteners are clips hidden under the seam, so nothing penetrates the panel face. Our panels are roll-formed on site to the exact length of each roof plane, so there are no horizontal laps on a run.
Not all standing seam performs the same, and this is where homeowners get tripped up. There are two very different seams sold under one name.
Snap-lock vs. mechanically seamed
Snap-lock panels snap onto each other during installation. The seam is not folded closed. It is faster to install and looks clean. On a steep roof that sheds water quickly, it can work well. Where snow, ice or wind-driven rain sit against the seam, water can find its way into the female leg. Performance depends heavily on pitch and drainage.
Mechanically seamed panels — what we call the 4Ever Armored system — use a 1.5-inch seam that is folded and locked closed with a seaming machine after the panels are down. The clips let the panel move with temperature while the seam stays locked. It manages standing water, snow and ice far better, works on very low slopes when designed for it, and handles complex roofs.
Here's the tradeoff: mechanical seaming takes more labor, more skill and specialized equipment. That shows up in the price. It also means fewer crews do it well.
Where it commonly fails
- Snap-lock seams on low-pitch or snow-loaded roofs, for the reason above.
- Clips spaced or fastened wrong, so the panel cannot move and oil-cans or works a fastener loose.
- Penetrations and transitions — chimneys, walls, valleys — detailed like an asphalt roof. The panel is rarely the problem. The detail work is.
- Panels cut short and lapped because they were not formed on site.
What it does well
Keeps water out instead of managing it after it gets in. Needs far less ongoing maintenance than exposed-fastener systems. Holds paint finish a long time because the fastener heads are not baking in the sun. Looks the way most people picture a metal roof.
Who it fits
A homeowner who wants the least maintenance over the longest time, and is planning to stay. It costs more up front than exposed-fastener panels — about the same as a good interlocking metal shingle — and pays that back in what it does not ask of you later.
Who it does not fit
If the budget is built around the lowest upfront number, an exposed-fastener roof installed well will cost less and you should know that. If the house has a very cut-up roof and the look of vertical seams bothers you, the interlocking shingle is worth a look. And if someone is quoting you snap-lock on a 3/12 pitch in northern Indiana, ask them the questions on this page.
Now you have the context to compare quotes.
