Castlemont Avenue
in Cambrian Park, San Jose
Castlemont Avenue runs through Cambrian Park, a mid-century tract neighborhood on San Jose's southwest side. This ranch house got a complete architectural shingle re-roof: old shingles stripped, soft decking replaced, box vents traded for a ridge vent, and a 50-year manufacturer warranty, all finished in 4 on-site days.
A Tired Roof,
Caught in Time
The Castlemont Avenue home was a 1960s-era single-story ranch in the heart of Cambrian Park — one of the established mid-century residential neighborhoods on San Jose's south-west side. The existing architectural shingle roof was 23 years old (installed in 2001 as the second replacement since the home was built), and classic end-of-service-life signals were everywhere: extensive granule loss visible in the gutters, curled shingles across the south-facing slopes, and growing moss colonies on the north-facing slopes where shade and fog exposure create persistent moisture conditions.
The homeowner had seen the signs and was proactive — scheduling the re-roof before active leaks developed, rather than waiting for water damage to force an emergency replacement. This approach saved significant money and aggravation compared to the reactive timing we often see. Their main concern was getting the project done correctly, with proper ventilation and materials that would deliver the full warranty life — not just another 20-year roof.
Three Things We Added to the Scope
Our Cambrian Park assessment identified three priorities beyond the straightforward re-roof scope: (1) ventilation upgrade — the home's original box vents were inadequate and likely contributed to the 2001 roof's premature shingle breakdown, (2) algae-resistant materials — north-facing slopes in Cambrian's fog exposure need specific product selection, and (3) proper deck inspection — 60+ year old homes often have localized deck issues that only surface during tear-off.
Material specification: CertainTeed Landmark architectural shingles in a weathered-wood color with StreakFighter algae resistance. Premium underlayment. Ice-and-water shield at valleys and penetrations. Full chimney and skylight flashing renewal. And importantly: new ridge ventilation system replacing the inadequate original box vents. Proper ventilation extends the new roof's warranty life and is often the difference between hitting the full 30-year service mark and getting only 18-20 years out of a quality shingle.
How the Job
Came Together
Photos, Attic Check & Written Scope
We photographed the old roof, checked in the attic how little air the box vents were moving, and gave the homeowner a written scope with shingle samples. Nothing went to the city until they signed off.
City Permit for a Cambrian Address
A routine re-roof permit from the City of San Jose, back to us in 3 business days. Cambrian Park isn't in a historic preservation area, so the plans needed no extra design review.
Tear-Off & Deck Inspection (Day 1-2)
Complete removal of existing 2001 shingle layer. Decking inspected across all slopes — we found and repaired approximately 18 sq ft of rotted decking at two locations (standard for 60+ year old homes with aging ventilation). Repairs documented with photos and quoted transparently as added scope.
Underlayment, Flashing & Ventilation Upgrade (Day 2-3)
On the repaired deck we rolled out CertainTeed DiamondDeck synthetic underlayment, sealed valleys and pipes with ice-and-water membrane, re-flashed the chimney and skylight, ran drip edge all the way round, and cut in the ridge vent that took over from the old box vents.
Shingle Installation (Day 3-4)
Weathered-wood CertainTeed Landmark with StreakFighter went down on a 6-nail pattern suited to San Jose winds, starting from a proper starter course and finishing with matching hip-and-ridge caps. We checked the edge details as each slope closed up.
Sign-Off & Paperwork
A City of San Jose inspector passed the job. The homeowner's packet held the 50-year SureStart PLUS registration, our 10-year workmanship warranty, the full set of job photos, and a record of the new ventilation for whoever owns the house next.
The Shingle System
We Installed
CertainTeed Landmark Architectural Shingles
An architectural asphalt shingle with StreakFighter algae protection, which earns its keep on Cambrian's shaded, foggy north slopes. It carries a 50-year limited warranty under SureStart PLUS, and the weathered-wood color was picked to sit well with the house's paint and trim.
CertainTeed DiamondDeck Synthetic Underlayment
Took the place of the 2001-era felt. It carries a 30-year warranty and holds up far better than felt to boots and weather while the roof is open.
CertainTeed WinterGuard Ice & Water Shield
A peel-and-stick membrane in each valley and around each pipe and vent, so the spots most likely to leak have a second line of defense under the shingles.
CertainTeed CertaShake Ridge Ventilation
A continuous vent along the ridge in place of the undersized box vents. An attic that breathes runs cooler and lets the shingles last as long as the maker intends, so we treated it as part of the job, not an extra.
Galvanized Steel Drip Edge
New drip edge at all eaves and rakes — protects the fascia and provides clean material termination. Previous installation had only partial drip edge coverage.
Where the Homeowner Ended Up
The homeowner got what they asked for at the start: a correctly installed roof with full warranty coverage, and an attic that now vents properly so the shingles can reach their full 30-year life. The one change from the original scope was the decking repair, and that was photographed and priced before we went ahead. The 50-year SureStart PLUS warranty sits alongside our 10-year workmanship warranty. Since then, the neighbor on Castlemont has called us to look at her own roof.
Castlemont Avenue
Gallery
Roofing a Ranch
in Cambrian Park
Cambrian Park is one of San Jose's established mid-century residential neighborhoods — developed predominantly between 1955 and 1975 on what was originally orchard land. The neighborhood is defined by single-story ranch homes on generous lots, with roof systems that reflect the era: mostly architectural asphalt shingle (some homes originally had wood shake that was converted in the 1980s-90s), some concrete tile on the more upscale streets, and occasional mid-century modern low-slope roofs on specific architectural styles.
What that means up on the roof: most Cambrian Park houses are 50-65 years old and already on their second or third roof. A lot of the original wood shake was swapped for composition shingle in the 1980s-90s, and those composition roofs are now wearing out in turn. Attic airflow usually falls short of today's standard, because 1960s builders relied on box vents that move roughly half the air current code calls for. Switching to a continuous ridge vent while the old roof is off is one of the best-value upgrades available, and it adds real life to the new shingles.
Cambrian's climate includes more fog exposure than central or eastern San Jose, especially on homes with mature tree canopies or north-facing slopes. This makes algae-resistant shingle formulations (CertainTeed StreakFighter, GAF StainGuard Plus) worth the modest upgrade cost — dark streaks on roofs are a visible sign of algae colonies that feed on shingle granules over time. Specifying algae-resistant materials is something we do by default for Cambrian projects.
What Cambrian Homeowners
Ask Us
Nearby Shingle Work
Willow Glen Re-Roof
A 1928 bungalow where the old skip-sheathed deck had to be covered with solid sheathing before new shingles could go on.
N 5th Street Home
A two-layer tear-off on an older downtown house, with copper chimney flashing and a shingle color chosen to suit the block.