A standing seam system where panels click together by hand along a shaped seam, with no seaming machine involved. Concealed clips hold each panel to the deck, so no fastener passes through the weather surface. It is the common residential standing seam choice.
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Both are standing seam. The difference is how the seam closes, and it changes where each can be used.
| Snap lock | Mechanically seamed | |
|---|---|---|
| Seam closed by | Hand pressure | A seaming machine on site |
| Typical minimum slope | Around 3:12 | Lower, product depending |
| Exposure suited to | Standard conditions | Higher wind, low slope |
| Cost | Lower of the two | Higher |
what sits inside a roofing quote covers what each adds to a quote.
On a normal residential pitch in ordinary exposure, which covers most houses. It installs faster, needs no hired machine, and gives the same concealed fastener benefit that makes standing seam worth having.
It is the wrong choice on a low slope or a very exposed site, where a folded seam resists uplift and driven rain better. Ask what minimum slope the specific panel is rated for. the full installation guide explains the rest of the system.
Not weaker as such, but the folded seam resists wind uplift and water intrusion better, which is why mechanical seaming is specified on low slopes and exposed sites.
Commonly around 3:12 as a minimum, though it depends on the specific panel. Check the manufacturer's published figure for the product being quoted.
Individual panels can be released more easily than seamed ones, which helps if a repair or a penetration is needed later.
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