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How is the metal roof mounted? I heard that typical installs use metal nails with rubber gaskets, and that needs replacement every couple of decades.

ProllyInfamous 2y ago
Look up "seamless metal roof," where the screws are installed beneath the sheathing. Most metal roofs I've installed use rubber-gasket-screws, but clients that can afford "seamless" do [it will shed water indefinitely, with no screwholes to eventually leak].
- WalterBright 2y ago
  The metal shingles in mine have grit bonded to the metal, so one can walk on the roof with much less risk of slipping off. Since it's a recent innovation, I knowingly took a risk on it. I suppose over time the grit will come off, but that won't cause a leak. The asphalt shingles will crack over time, and crack when you walk on them, leading to leaks. I hate the cedar shake roofs, because they mildew and wasps nest in them.
  - throwaway48476 2y ago
    The metal and epoxy will thermal cycle at different rates. Curious to know how long this will last.
    - WalterBright 2y ago
      So am I :-) Some things I was warned about but did anyway. The insulation is icynene foam. Some foams disintegrate over time, but this one has not at all. It's far more effective than fiberglass, no breathing in fiberglass, no mildew. I'm very pleased with it. (The GC made me take full responsibility for it!)
WalterBright 2y ago
The shingles are nailed at the top, and the overlapping one keeps it dry. (On mine, they're screwed in.) High winds could drive the water up under the shingles, but that happens rarely so they aren't kept wet. Anything that goes through the roof disrupts this, so skylights, vents, chimneys, fans, antennas, etc., all are points of concern.
- throwaway48476 2y ago
  The water barrier roof is actually the tar paper. The shingles are just there to protect the water barrier from the elements. Mostly UV.

ProllyInfamous 2y ago

Look up "seamless metal roof," where the screws are installed beneath the sheathing. Most metal roofs I've installed use rubber-gasket-screws, but clients that can afford "seamless" do [it will shed water indefinitely, with no screwholes to eventually leak].

WalterBright 2y ago
The metal shingles in mine have grit bonded to the metal, so one can walk on the roof with much less risk of slipping off. Since it's a recent innovation, I knowingly took a risk on it. I suppose over time the grit will come off, but that won't cause a leak. The asphalt shingles will crack over time, and crack when you walk on them, leading to leaks. I hate the cedar shake roofs, because they mildew and wasps nest in them.
- throwaway48476 2y ago
  The metal and epoxy will thermal cycle at different rates. Curious to know how long this will last.
  - WalterBright 2y ago
    So am I :-) Some things I was warned about but did anyway. The insulation is icynene foam. Some foams disintegrate over time, but this one has not at all. It's far more effective than fiberglass, no breathing in fiberglass, no mildew. I'm very pleased with it. (The GC made me take full responsibility for it!)

WalterBright 2y ago

The shingles are nailed at the top, and the overlapping one keeps it dry. (On mine, they're screwed in.) High winds could drive the water up under the shingles, but that happens rarely so they aren't kept wet. Anything that goes through the roof disrupts this, so skylights, vents, chimneys, fans, antennas, etc., all are points of concern.

throwaway48476 2y ago
The water barrier roof is actually the tar paper. The shingles are just there to protect the water barrier from the elements. Mostly UV.