Why the Attachment Method Matters as Much as the Metal
When people picture "metal roofing," they usually picture the finished look — but how the panels attach to the roof affects performance just as much as the metal itself. There are two main approaches: concealed fastening (standing seam) and exposed fastening (which includes profiles like corrugated and desert rib).
Standing Seam Roofing
Standing seam panels have raised vertical ribs along each edge that interlock with the adjacent panel. The panels attach to the roof deck using concealed clips hidden underneath the seam, so no fasteners penetrate the visible surface of the panel at all.
Advantages:
- No exposed fastener holes means no penetration points for water to work through over time
- Concealed clips allow the metal to expand and contract naturally with temperature changes, without stressing the fasteners — an important detail in New Mexico's wide day-to-night temperature swings
- Cleaner, more modern appearance with no visible screws
- Generally the longest-lasting metal roofing option, often backed by stronger weathertight warranties
Trade-offs:
- Higher material and installation cost
- Installation requires more specialized skill and equipment
Exposed Fastener Systems
Exposed fastener panels — including profiles like corrugated and desert rib — attach directly to the roof deck with screws that penetrate through the face of the panel. The screw heads remain visible, though they're typically painted to match the panel color.
Advantages:
- More affordable than standing seam
- Faster, simpler installation
- Wider panel options, which can mean less material and labor overall
- Easier to source repair materials and make small repairs
Trade-offs:
- Each screw is a potential penetration point, which increases the importance of proper installation and gasket condition
- As metal expands and contracts with temperature swings, fasteners can gradually work loose over time — a process sometimes called fastener withdrawal
- Generally a shorter service life than standing seam before maintenance or fastener replacement is needed
- More visible, less streamlined appearance
Common Profile Types
Beyond the fastening method, metal roofing comes in several distinct panel shapes:
- Standing seam — the concealed-fastener system described above, in various rib spacing and height options
- Desert rib — an exposed-fastener panel with a distinctive rib pattern, popular in the Southwest for its regional aesthetic
- Corrugated — a classic wavy-panel exposed-fastener profile, often the most economical option
- Regional "Zia" profile — a locally available panel style offered through New Mexico metal suppliers, providing another exposed-fastener option with its own visual character
Pricing between exposed-fastener profiles is often similar, with standing seam commanding a higher price across the board due to its more complex manufacturing and installation. Premium color finishes can add cost on top of the base profile price, regardless of which profile is chosen.
Which Should You Choose?
- Want the longest possible lifespan and lowest long-term maintenance? Standing seam is the stronger long-term investment.
- Working with a tighter budget or want a faster installation? An exposed fastener profile like desert rib or corrugated is a dependable, cost-effective choice.
- Want a distinctly Southwest look? Desert rib or a regional profile may fit the home's architectural style particularly well.
For more on this topic, see our guide on Metal Roofing vs. Shingles.