How a snap-lock seam works
- Clips are fastened to the deck along the edge of each panel (or the panel has a nailing flange)
- The next panel's leg is set over the first panel's leg
- Pressing along the seam snaps the legs together and locks them over the clips
- No screw goes through the flat of the panel, so no fastener is exposed to the sun
Clip, or nail strip?
| Clip-fastened snap-lock | Nail-strip (fastener flange) | |
|---|---|---|
| Fastening | Separate clips under the seam | Screws through a slotted flange on the panel edge |
| Thermal movement | Clips let long panels slide as they heat and cool | Fine for shorter runs; long runs move less freely |
| Typical use | Homes, long ranch roofs, lake houses | Shorter runs, porches, accent roofs |
General characteristics. The clip, spacing and run limits come from the panel manufacturer's installation guide.
Slope: where snap-lock stops
Snap-lock seams aren't built to sit under standing water, so they rely on slope to shed it. Many snap-lock panels are published for about 3:12 and steeper, and some taller seams are rated somewhat lower over a solid deck. Below the panel's minimum, a mechanically seamed panel is the right call. We check every slope on your roof against the published minimum before we quote.
Seam height and panel width
- Seam height: seams from 1 inch to about 1-3/4 inches are common. Taller seams look bolder and handle water and wind a little better.
- Panel width: narrower panels show less waviness (oil-canning) in the flat; wider panels cover faster.
- Striations or pencil ribs in the flat help hide oil-canning, especially in dark colors.
Snap-lock in North Texas weather
Here, wind uplift and hail matter more than seam looks. Clip spacing near eaves, rakes and corners, a full-coverage high-temperature underlayment and a heavier gauge all add up. Our panels are 24 or 26 gauge, never thinner. On open ranch land and lake lots, we'll tell you when a mechanically seamed panel is worth the extra cost.
What sets the price
- Roof size and the number of hips, valleys and dormers
- Gauge and paint system
- Tear-off, or going over the existing roof where code and the manufacturer allow
- Underlayment and ventilation
- Trim, flashing and painted pipe boots
We quote your actual roof after a free inspection. Most residential installs take one day. See standing seam cost factors and the snap-lock vs. mechanical-lock comparison.
More metal: snap-lock standing seam · mechanically seamed · commercial R-panel · 26 gauge · roll-formed to length · retrofit over an existing roof · back to metal roofing
Residential warranty: a workmanship warranty from 10 years up to lifetime, depending on the job, with manufacturer warranties up to lifetime. Manufacturer coverage depends on the product and brand, and on the project qualifying for that manufacturer's program. We put the exact warranty for your roof in writing.
Certified, with 30 years installing every major roofing brand, a family roofing business going back 75 years, and over $80 million in completed roofing projects. 5.0 stars on Google at all three of our offices.
Request a free inspection or call (817) 733-9228. Small repairs are welcome too.