Standing seam panels are joined by raised seams and fastened with hidden clips or seams, so no screws go through the face of the panel. Exposed-fastener panels are screwed through the face with rubber-washered screws. Standing seam costs more, needs less maintenance, and works on lower slopes. Exposed fastener costs less but needs periodic screw checks.
Side by side
| Standing seam | Exposed fastener | |
|---|---|---|
| Fasteners | Hidden under the seams | Screws through the panel face |
| Upfront cost | Higher | Lower |
| Maintenance | Minimal | Check and replace screws over time |
| Lowest slope | Below 1:12 for many products | About 1:12 minimum, more often 2:12 to 3:12 |
| Look | Clean, modern lines | Ribbed, more agricultural |
Why exposed screws matter
Every screw through an exposed-fastener panel is a hole that depends on a rubber washer to stay sealed. Those washers can break down after 10 to 20 years in the sun. Replacing screws is simple and inexpensive, but it is a maintenance item that standing seam largely avoids.
Which is right for your home?
Standing seam is the more common choice for homes where appearance and long life matter, and for low-slope sections like porches. Exposed-fastener panels can be a cost-effective choice for outbuildings, shops, and some homes. Panel minimums vary by manufacturer, so the exact slope limits for any product come from its installation guide.
By the numbers
- Standing seam: generally the best option for slopes below 1:12 (McElroy Metal).
- Exposed fastener: starts at 1:12, with 2:12 and 3:12 more common; laps may need sealant tape below 3:12 (McElroy Metal).
- Exposed-fastener washers may degrade after 10 to 20 years (McElroy Metal).
Thinking about metal for your home? Schedule a roof inspection or call (901) 834-7663, and we’ll tell you whether metal makes sense for your roof.
