Two roofs in Felton, deep in the redwoods of the San Lorenzo Valley. Off East Creek Road, a steep-pitched mountain home got a full tear-off, new CDX plywood decking where the old deck had failed, peel-and-stick ice-and-water underlayment across the whole roof, and Owens Corning architectural shingles — $30,000. A few streets over on Altamont Drive, a smaller home got a new shingle roof plus a rebuilt low-slope section — $10,900. Both are Class A roofs built for a place where fire season and rainy season are each serious.
What Does a Roof Replacement Cost in Felton?
These two Felton roof replacements cost $30,000 and $10,900. The East Creek Road project — $30,000 — was a full tear-off on a steep, multi-gable mountain home: damaged decking replaced with new CDX plywood, Titanium PSU30 peel-and-stick ice-and-water underlayment across the entire roof, new flashings and vents, and Owens Corning architectural shingles. The Altamont Drive project — $10,900 — was a smaller home with a shingle reroof over new synthetic underlayment plus a low-slope section that was stripped and rebuilt. In the Santa Cruz Mountains the number is driven by three things beyond roof size: pitch and complexity (steep, cut-up roofs take longer and need more safety setup), decking condition under decades of redwood litter and shade, and the underlayment you choose — full peel-and-stick costs more than felt and is worth every dollar on a roof that sits under a canopy that never lets it dry.
A Steep Mountain Roof Under the Redwoods, Rebuilt Deck-Up
Julia’s home sits off East Creek Road in Felton, in a clearing ringed by second-growth redwoods that tower over the roof. It is a handsome, cut-up mountain house — multiple gables, dormers, a chimney, steep pitches that run water fast and make every valley a collection point for needles and bark. The existing roof had reached the stage where redwood litter had been composting in the valleys for years: shingles worn smooth, the surface stained where debris held moisture, and soft spots in the deck that you could feel underfoot on the shaded north slopes. The tear-off confirmed it — sections of the original sheathing were delaminated and had to come out. We replaced the damaged decking with new CDX plywood, then covered the entire roof — not just the eaves and valleys — in Titanium PSU30, a self-adhering peel-and-stick ice-and-water membrane, so the whole deck is sealed under the shingles. New flashings went in at every pipe, vent and the chimney, and the finish is Owens Corning architectural shingles in a light gray that brightens a house that spends most of the day in shade.
A Smaller Felton Roof With a Low-Slope Section to Solve
Alex’s home on Altamont Drive is the other end of the Felton spectrum: a smaller, simpler roof with one complication — a low-slope section that had been roofed in old torch-down and was the source of the leaks. The shingle slopes got a straightforward reroof: tear-off, Titanium UDL30 synthetic underlayment, new flashings and a dark architectural shingle. The low-slope section was stripped to the deck and rebuilt as its own system, because shingles do not belong on a roof that flat; on a roof this size, that detail is where the money and the risk live. The whole project came to $10,900 — a useful benchmark for what a modest Santa Cruz Mountains roof costs when there is no major decking work and no steep-pitch premium. If your home has a flat porch, addition or carport roof tied into a shingle roof, our flat roof guide covers the options for that section.
Two Felton Roofs, Side by Side
| Feature | East Creek Road | Altamont Drive |
|---|---|---|
| Roof | Steep, multi-gable mountain home with dormers and chimney | Smaller, simpler roof with a low-slope section |
| Deck | Damaged sheathing replaced with new CDX plywood | Existing deck sound |
| Underlayment | Titanium PSU30 peel-and-stick, entire roof | Titanium UDL30 synthetic |
| Low-slope section | — | Stripped and rebuilt as its own system |
| Shingle | Owens Corning architectural, light gray | Architectural shingle, dark |
| Fire rating | Class A assembly | Class A assembly |
| Cost | $30,000 | $10,900 |
Both roofs were completed in the fall, ahead of the San Lorenzo Valley’s rainy season — which arrives earlier and harder in the mountains than it does on the valley floor a few miles east.
What This Means for Homeowners in Felton and the Santa Cruz Mountains
Roofs in Felton, Ben Lomond, Boulder Creek, Scotts Valley and the rest of the San Lorenzo Valley face a combination almost no other Bay Area roof does: a redwood canopy that drops needles and bark year-round and blocks the sun, forty-plus inches of rain that arrive in atmospheric-river bursts, and a wildland-urban interface where the CZU fire is a fresh memory. Three lessons from these two jobs apply to every mountain roof. Keep valleys and low-slope sections clear, because composted redwood litter is what rots decking. Spend on the underlayment — a full peel-and-stick membrane or, at minimum, ice-and-water at every eave, valley and penetration — because that is the layer that keeps a shaded, never-dry roof watertight when the shingles are overwhelmed. And insist on a Class A assembly, which is what asphalt architectural shingles over a solid deck deliver, and which matters for both fire safety and insurance in this terrain. Our Santa Cruz County roofing team works the whole valley; see our shingle roofing page for the systems we install.
Felton Roof Replacement — FAQs
Why do steep mountain roofs cost more to replace?
Steep pitches and cut-up rooflines take longer at every stage: tear-off, decking, underlayment and shingling all slow down when the crew is working on ropes and staging across multiple gables and dormers. Material waste rises with every valley and hip. The East Creek Road roof carried all of that, plus decking replacement, which is why it came in at $30,000 while the simpler Altamont Drive roof came in at $10,900.
What is peel-and-stick underlayment and why use it on the whole roof?
Peel-and-stick, or self-adhering ice-and-water membrane, bonds directly to the deck and seals around every nail, so water that gets past the shingles cannot reach the wood. Most roofs use it only at eaves and valleys; on the East Creek Road project we used Titanium PSU30 across the entire roof because the redwood canopy keeps the surface damp for weeks at a time and the pitch drives rain hard into every seam. It costs more than felt or standard synthetic, and on a shaded mountain roof it is the best money in the bid.
Do you replace roof decking during a reroof?
Only where it has failed. On the East Creek Road project the tear-off revealed delaminated, soft sheathing on the shaded slopes, and we replaced those sections with new CDX plywood before the underlayment went down. Decking replacement is priced per sheet and confirmed at tear-off, which is why mountain roofs under heavy tree cover should carry an allowance for it.
Are asphalt shingles a good choice in a wildfire zone like Felton?
Yes. Asphalt architectural shingles installed over a solid deck form a Class A fire-rated roof assembly — the highest rating — and are the most common code-compliant choice in California’s wildland-urban interface. Both Felton projects were completed as Class A assemblies, replacing worn roofs that had been collecting dry redwood litter for years.
How much does a roof replacement cost in Felton or the Santa Cruz Mountains?
These two projects came to $30,000 for a steep, complex mountain home with decking replacement and full peel-and-stick underlayment, and $10,900 for a smaller home with a shingle reroof and a rebuilt low-slope section. Pitch, complexity, decking condition and underlayment choice move the number; see our Bay Area roof replacement cost guide for current ranges.
Need a Roof Replaced in the Santa Cruz Mountains?
Steep, shaded, cut-up or simple — we’ll inspect it and tell you what the deck and the trees have done to it. See more of our work in the project gallery, or book a free inspection today.
Gina K. writes about Bay Area roofing for Lifetime Roofing & Renovation, drawing on the team's 16+ years of experience and 1,000+ completed roofs across Silicon Valley.
