Slate Roofing in San Jose, CA

Name: San Jose Roof Repair
Telephone: 6504145505
Price range: $$

San Jose Roof Repair repairs and replaces slate roofs that bake through dry summers and then take winter rain in hard bursts. Slate is heavy stone over a wood deck, so we check the framing and sheathing before a single tile goes down. Call 6504145505 for a free roof estimate.

Call 6504145505

Roofing crew tearing off failed slate tiles and checking plywood sheathing before installing synthetic underlayment and new flashing on a San Jose roof

Slate roofing is natural stone split into flat tiles and laid in staggered courses up the roof deck.

On the 1950s and 1960s mid-century ranch homes around here, that usually means a full tear-off down to the plywood so we can see what the stone has been hiding.

Cost comes down to slate grade and thickness first, then whether the roof allows a recover over the existing substrate or needs a full tear-off.

Decking rotted under old felt and tar paper adds labor. So do valleys, chimney flashing, dormers, and skylights, each of which needs its own detail work.

What we install: a self-adhered ice-and-water shield along the eaves and valleys, synthetic underlayment across the rest of the deck, new step flashing and counter-flashing, and stainless fasteners that will not stain the stone. Ridge cap and ridge vents close out the roofline.

San Jose's low humidity slows the moss that eats slate in wetter climates, but the intense sun still spalls the surface, and winter rain wicks into any open gap. We see it most on the early 1900s Spanish Colonial Revival homes in the older downtown blocks.

If slate is outside your budget, we also install asphalt shingles from GAF, Owens Corning, and CertainTeed, including architectural shingle profiles that read like slate at a fraction of the weight.

What's Included

A written roof inspection of the slate field, ridge, valleys, and every penetration, with photos attached to the report.
A line-item roof estimate that separates tear-off, dumpster, decking repair, underlayment, and slate so you can see where the money goes.
Careful removal of failed tiles with hand tools, plus a check of the substrate under each one for rot or soft spots.
Replacement of cracked or missing slate matched as closely as the quarry allows, laid in staggered courses from the starter course up.
New ice-and-water shield at the eaves and valleys, and synthetic underlayment where the old felt and tar paper have failed.
Fresh step flashing, counter-flashing, and chimney flashing sealed with roof cement and a compatible caulk.
A magnetic sweep of the lawn, driveway, and planting beds for dropped nails and slate shards before we pull the dumpster.
Our written workmanship warranty on labor, plus the manufacturer warranty paperwork on any new materials.

Our Slate Roofing Process

What a Slate Roofing Job Looks Like, Step by Step

We start with a roof inspection from the ground and from the roof itself, using a ladder on the easy pitches and a safety harness on anything steep.
Every cracked, slipped, or spalled tile gets photographed, along with the valley, ridge, hips, and gables.
You get a written roof estimate that breaks tear-off, dumpster, decking repair, underlayment, and slate into separate line items.
On day one we drop the dumpster and strip the failed section with pry bars and roofing shovels, keeping the debris chute clear of your landscaping.
Rotted plywood or OSB sheathing is cut out and replaced before anything new goes down, since new stone over soft decking will not hold.
We lay ice-and-water shield at the eaves and valleys, then synthetic underlayment across the field, fastened with ring-shank nails and lapped per building code.
New tiles go down in staggered courses, with step flashing and counter-flashing at the walls and a bead of mastic where slate meets masonry.
We finish the ridge cap, haul the dumpster, and run a magnet over the lawn for stray nails and slate shards.

Free Inspection

We assess your roof with a thorough inspection and provide a detailed photo report — no cost, no obligation.

Clear Estimate

You get an itemized scope with materials, labor, and timeline. No hidden fees. We discuss insurance and financing options.

Expert Work

Licensed crews arrive on schedule, protect your property, complete the work, and clean up thoroughly.

Final Walkthrough

You inspect with us. We document everything with before/after photos. Warranty registered and paperwork delivered.

Signs You Need Slate Roofing

Signs Your Slate Roof Needs Attention

Tiles that have spalled, flaked, or peeled at the surface after years of intense sun.
Slipped or missing tiles along the eave or rake, which leaves the underlayment bare to the next storm.
Granule loss and bald patches on any asphalt shingle section where an earlier repair butted into the slate.
Rust streaks running down the stone from a corroded pipe boot, vent boot, or an old steel fastener.
Brown ceiling stains or a musty attic smell, which usually means water is wicking along the rafters.
Crumbling mortar and open gaps at the chimney flashing or counter-flashing.
A sagging gutter run or a downspout that dumps right at the fascia, soaking the soffit and eave.
Moss or algae patches on the north slope, which San Jose's low humidity keeps in check but never fully prevents.

Slate Roofing — Frequently Asked Questions

How much does slate roofing cost in San Jose?

Slate roofing costs more than asphalt because the stone is quarried and the work is slower. The number moves most with slate grade, how much sheathing needs replacing, and how many chimneys and skylights need flashing, so we put a line-item estimate in writing first.

How long does a slate roof replacement take?

Slate roofing runs slower than a shingle tear-off. A typical home takes several days to a couple of weeks, depending on square footage, pitch, and weather. Winter rain is the real schedule risk, so we tarp exposed decking overnight.

Can you repair slate instead of replacing the whole roof?

Slate roofing can often be mended rather than replaced. If the field is sound and the leaks trace to a valley or a flashing failure, we fix those and leave the rest. Once the underlayment shows widespread decay, patching stops making sense.

Does homeowners insurance cover slate roof damage?

Slate roofing is usually covered when damage comes from wind, hail, or a fallen limb, not from age. We photograph what we find, note the storm date, and help you file the claim. Meeting the adjuster on the roof is part of it.

Do you install other roofing materials besides slate?

Slate roofing is one of several systems we install. We also handle asphalt shingles, cedar shake, clay tile, concrete tile, and standing-seam metal panels, plus TPO and modified bitumen for low-slope porch roofs. Plenty of homes here have two roof types on one structure.

When is the best time of year for slate work in San Jose?

Slate roofing goes on best in the dry months, roughly late spring through early fall, when the deck stays dry and the underlayment seals properly. Winter rain storms that stress roofing systems make scheduling harder, but emergency repairs happen all year.

Don't just take our word for it — hear from our satisfied customers.

“We have a 1920s Spanish Colonial Revival near downtown with original slate on the front slope. Three tiles had slipped and water was wicking into the fascia. Their crew matched the color, reset the tiles, and replaced the step flashing. No more stain on the ceiling.” — Maria G., Downtown San Jose

“Our mid-century ranch in Willow Glen had a leaking valley and two cracked tiles after a winter storm. We got a line-item estimate, photos of the rotted decking, and the repair finished in one day.” — Daniel R., Willow Glen

“We collected three quotes for slate roofing on our Almaden Valley home, and theirs was the only one that explained what happens to the underlayment when the old felt fails. Straight answers, no pressure.” — Priya S., Almaden Valley