Frequently Asked Questions
Common questions San Jose homeowners ask about South Bay Roofing CO's roofing services.
What roofing materials do you install on a San Jose home?
Your roof pitch decides the menu. We install asphalt shingle, architectural shingle, and three-tab shingle on most sloped homes, plus wood shake or cedar shake where the framing can carry it. Heavier options include slate, clay tile, concrete tile, and metal panel systems such as standing-seam panel and corrugated panel. Flat rooftops get TPO, EPDM, or PVC membrane, and commercial buildings often keep a built-up roof or modified bitumen assembly that we recoat or torch down. Gable, hip, mansard, or gambrel shapes all get the same careful detailing, and any honest roofer shows you the deck before quoting.
What goes under the shingles, and why does it matter more than the shingle color?
Underlayment is the layer you never see and the one that keeps water out. We roll synthetic underlayment instead of old roofing felt or tar paper, run an ice-and-water shield along valleys and eaves, and set nails and fasteners with a nail gun and air compressor so nothing gets overdriven or swapped for a screw. An ice dam is rare here, but the same shield stops water that seeps sideways at the eave. Older roofs may still hide a vapor barrier or a built-up roof mopped with tar and bitumen that cracked years ago.
How do you decide between a roof repair and a roof replacement?
We start with a roof inspection of the decking, the sheathing, and the flashing before we hand you a roof estimate. If the plywood and OSB are dry and the damage is isolated, we fix it: refit step flashing, reseal a valley with roof cement or mastic, swap a pipe boot or vent boot, and reset the ridge cap. When we see rot, decay, sag, or widespread granule loss, a repair only delays a roof replacement. That call is the roofer job, and we would rather reseal than oversell.
What warning signs can I check from the ground?
Stand back and study the roofline. Stains at the eave, soffit, or fascia usually mean water is wicking backward into the assembly. Then look at the drip edge, the rake and verge boards, and any chimney flashing, counter-flashing, or apron flashing. A torn pipe flashing, a lifted boot flashing, a clogged gutter, or a downspout that dumps beside the foundation all point to the same thing. Check the rooftop around each dormer and skylight too, because that is where most leaks start.
What actually happens on install day?
We drop a dumpster, stage material by the ladder, cover the overhang and any awning, and haul debris away the same week. Crews work off scaffold or ladder in a safety harness, strip the old asphalt with a pry bar and roofing shovel, then check the substrate over the truss, rafter, and joist framing. Any rotted purlin, batten, or counterbatten comes out before the starter course and field course go down. Ridge beam, hip, and gable lines get verified with a roofing square before we leave.
How do ventilation, drainage, and building code fit into all this?
Dry summers with intense sun bake shingles, and low humidity lets algae and moss grow on shaded slopes, so ventilation is not optional here. We pair a ridge vent with a soffit vent, add insulation, and often an attic fan to push hot air out of the attic. Sealant, caulk, adhesive, and coating go on every penetration, and we finish waterproofing and weatherproofing at each anchor and snow guard. Building code also governs scupper drains, coping caps, and parapet walls on commercial rooftops.