Metal roofing in Miami

Metal has become the serious alternative to tile in South Florida, and for good reasons. It is light, so it does not need the structure tile needs. It sheds water fast, which matters on lower slopes. It reflects heat rather than storing it. And a correctly specified metal roof carries very high wind ratings.

The word doing the work in that last sentence is correctly. Metal roofing covers a wide range, from concealed-fastener standing seam down to exposed-fastener panels, and they do not perform the same. In the HVHZ, panel profile, gauge, clip spacing and fastening schedule are the whole ballgame, and they are exactly what gets thinned out of a cheap quote.

When metal is worth considering

• Replacing a shingle roof and wanting materially longer life
• A structure that cannot take the weight of tile
• Lower-slope sections where shingle is a poor choice
• Coastal exposure where corrosion resistance matters
• Wanting reflectivity to reduce heat gain
• An existing metal roof with backing-out fasteners or corroded panels

What metal roofing involves

Specification first. Standing seam with concealed clips generally outperforms exposed-fastener panels in both wind resistance and longevity, because exposed fasteners rely on gaskets that degrade and back out over time. Near salt water, the coating system and the substrate matter as much as the profile does.

Installation is where metal is won or lost. Panels move with heat, so allowance for thermal movement, correct clip spacing, proper flashing at every penetration and correct edge detailing are essential. The Miami-Dade approval for the assembly specifies these, and following it is what makes the rating real.

Existing metal roofs are often repairable. Fasteners can be upsized and re-gasketed, panels replaced individually, and flashings rebuilt, which is usually far cheaper than replacement if the panels themselves are sound.