Fremont roofs on the east side of the bay

How does the bay air affect the metal on these roofs?

Damp bay air keeps metal wet after rain, and corrosion starts at the fixings and the cut edges. The technician checks those first and replaces any flashing that has pitted or rusted through.

Fixings are matched to the metal, and the sealant at each joint is chosen for it. The scope names the metal and the reason for it.

The east-side flat sections are also checked at the seam where the membrane meets the parapet. That seam takes the thermal movement of the sun and then the cool of the evening, and a split there is common enough that it is inspected on every visit.

What do the storms reveal on a valley-side roof?

A long storm finds the valleys, the vent flashings and the gutter outlets, in that order. The trace starts from the attic beneath the stain, following the wet framing to the entry point.

The outlets are checked for a discharge that lands against the wall. Any such outlet is extended to a splash block or a short pipe that carries the water clear.

How are the sunny faces checked?

The sunny faces of a covering wear first, with granules coming away and the tabs drying at the nail line. The technician records each face, so a replacement can be planned slope by slope where the rest of the roof is sound.

The attic over the sunny side is read for heat, and blocked intakes are cleared so the covering is not cooked from below.

What does a newer subdivision roof show?

A newer subdivision roof often has a covering that still looks fresh, with the faults at the penetrations and the valleys rather than in the field of the covering. The technician reads those parts first, since they are where a newer roof usually leaks.

The attic on a newer house is read for ventilation, and the balance of the intake and the exhaust is checked against the design. The readings are recorded with the scope.

What does the east-side climate mean for a rooftop unit?

Rooftop heating and cooling units on commercial frontages sit on curbs that must be sealed where the membrane meets them. The seal is checked for cracks and the curb's flashing for lift, since a leak at a unit's curb often shows as a stain on a ceiling below.

The technician notes each unit's position on the roof plan so the seals are checked on the same route each season.

A commercial roof record names each unit, drain and parapet by its number, so a later visit can start from the same plan.