1″ vs. 1.5″ Snap Lock: What Actually Changes Between Them
We get asked about this pairing a lot: two panels, both called Snap Lock, half an inch apart in seam height, and it’s not always obvious why a job would need one over the other. Short version — they’re closer to identical twins than most people expect. Here’s exactly where they match and where they don’t.
What’s the same
Both panels are concealed fastener standing seam, both snap together by hand with no mechanical seamer needed, and both come in 26, 24, or 22 gauge. Minimum recommended pitch is 3:12 on either one. Both carry the same 40-year limited warranty on smooth and crinkle colors, both are available pre-notched, and both get striations or minor ribs recommended to cut down on oil canning. Neither has a length restriction. If you’re choosing based on performance specs alone, there’s genuinely not much daylight between them.
What’s actually different
Two things: coverage width and seam height.
The 1″ panel covers 16″ per sheet. The 1.5″ panel covers 14.75″. That’s a small gap, but over a full roof it adds up to a few more panels, and a few more seams, to cover the same square footage with the 1.5″. Not a dealbreaker, just worth knowing before you order.
The bigger difference is how they look once they’re up. A 1″ seam sits lower and reads flatter — more contemporary, less shadow line. Bump it to 1.5″ and the seam stands up more, throwing a deeper shadow that leans toward the traditional standing-seam look a lot of clients picture when they say “metal roof.” Same panel family, genuinely different finished appearance from ten feet away.
Which one to spec
If the client wants the cleanest, most minimal roofline possible, or you’re trying to keep panel count as low as practical, the 1″ width usually wins. If they want that classic, more dramatic standing-seam profile — the kind that reads as “metal roof” from the street — the 1.5″ earns its keep. Both showed up on our modern house and commercial building jobs (1″ width) and on the homestead project that paired 1.5″ Snap Lock with Tuff Rib siding — worth a look if you want to see the difference in person rather than on paper.
Either width comes in 40+ colors with a spec sheet ready for your bid — see the 1″ Snap Lock and 1.5″ Snap Lock product pages for full details, or get in touch if you want a second opinion on which one fits a specific job.
