How long a roof lasts in Pomona

Rated life versus real life

Manufacturers rate a shingle in laboratory conditions and perfect installation. The number on the packet is a ceiling, not a forecast. What a roof achieves in Pomona depends on the weather it takes, how well the attic beneath it breathes, and whether it was nailed correctly on the day.

What each covering typically manages

Architectural asphalt generally reaches twenty-five to thirty years, and lands nearer the lower end where sun and heat are relentless. Concrete and clay tile outlast their own underlayment several times over. Standing-seam metal is a forty-to-seventy-year covering. Flat membranes sit at twenty to thirty, and shorter where water ponds.

What actually shortens it

Ventilation, more than anything. An attic that traps heat cooks the covering from below and takes years off it invisibly. After that: shaded slopes that stay damp, penetrations that were never detailed properly, and second layers laid over a first.

What to do about it

Two inspections a year and clear gutters buy real time. Beyond that, the useful move is to know the number. Ask any contractor who looks at your roof for an estimated remaining life in years, and what would extend it.