Presidio Roofing & Commercial Roof Repair

Licensed, insured and working in Presidio

Shaded north slopes in Presidio hold moisture well past sunrise, which is why moss shows up there earliest and nowhere else. The temperature swing in Presidio is narrow but the humidity is not, and sustained damp is harder on underlayment than high temperatures alone. Put simply, most roofs in Presidio fall into three groups: original coverings near the end of their life, replacements from the last two decades, and low-slope sections added later. Nearly all Presidio roof coverings that fail early give out at a penetration someone could have resealed for a few hundred dollars.

Checking the attic after the first heavy rainfall in Presidio finds leaks while they are still stains rather than damage. Streets in Presidio that were built out together tend to require roof coverings together, which is why one re-roof commonly brings three more on the same block. Marine layer keeps Presidio roofs damp into late morning most of the year, and slow-drying surfaces favour moss on the shaded slopes. On most jobs, vents and caps corrode faster than the roof in Presidio, and replacing them during a re-roof costs almost nothing. San Francisco County is no different.

In practice, a Presidio property often carries more than one roof covering type — a pitched main house in one material and a flatter garage or addition in another. Many Presidio properties carry a covering chosen for price rather than climate, and it shows in how early it fails. Two visits a year keeps a Presidio roof honest: clear the valleys and gutters before the rains, and inspect the flashings following the first heavy storm. Where Presidio buildings have been re-roofed twice, the next job is a tear-off regardless of what the property owner would prefer. This holds across San Francisco County.

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