Torch Down Modified Bitumen: Costs, Lifespan and Alternatives

Bayview sits in San Francisco County and takes long dry heat, hard thermal cycling and rain that arrives in a few concentrated storms. In practice that means asphalt dries out and sealant pulls back from penetrations years before the field wears through.

We start at the flashings, check the deck from inside the attic, and photograph every elevation. On a Bayview property we pay particular attention to dried-out underlayment and attic temperature.

Granules in the gutters, curling tabs, repeat stains in the same ceiling after every storm, and soft spots underfoot. In Bayview, asphalt dries out and sealant pulls back from penetrations years before the field wears through.

Two visits a year: clear valleys and gutters before the rains, then check flashings after the first real storm. In Bayview that matters most because asphalt dries out and sealant pulls back from penetrations years before the field wears through.

In inland conditions, composition shingle runs roughly fifteen to twenty-five years, tile underlayment twenty to twenty-five, and coatings seven to fifteen depending on the system.

Size, pitch, layer count and deck condition drive the number on any Bayview roof. The line that moves is deck repair, so it belongs in the Bayview quote at a rate per sheet rather than as an allowance.

A full replacement in Bayview is permitted and inspected through the San Francisco Department of Building Inspection. Small repairs generally are not, but the layer count and assembly are checked on any permitted job.

Check the licence, liability cover and workers' compensation, then ask any Bayview contractor what happens if the deck is worse than expected — and get that answer in writing before the covering comes off.