Torch Down Modified Bitumen: Costs, Lifespan and Alternatives

Portola 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 Portola property we pay particular attention to dried-out underlayment and attic temperature.

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

Repair makes sense on a Portola roof with life left and one localised failure. Once the covering is past its service life, repairs buy months and a replacement buys decades.

Granules in the gutters, curling tabs, repeat stains in the same ceiling after every storm, and soft spots underfoot. In Portola, 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.

We cover Portola across San Francisco County, including Visitacion Valley, Bayview and Bernal Heights, and the rest of the service area listed on the site.

One to three days on a typical Portola property, depending on size, pitch and how much deck needs replacing. Nothing is left open overnight.