Roof Replacement in Mill Valley, CA

What a Roof Replacement Removes and Installs

A roof replacement strips the old system down to the roof deck instead of laying a second layer over it. We tear off existing courses, pull the nails, and check the sheathing for rot, soft spots, and water staining before anything new goes down.

• The roof deck and sheathing get inspected sheet by sheet; plywood or OSB that has swollen or delaminated comes out and gets replaced.
• Synthetic underlayment replaces old roofing felt and tar paper across the field, because it holds up when the deck expands and contracts in heat.
• A self-adhered ice-and-water shield runs along the eaves and through the valley where two roof planes meet and water concentrates.
• Drip edge goes on at the eave and rake so runoff clears the fascia instead of wicking into the wood behind it.
• Step flashing, counter-flashing, and chimney flashing are replaced at every sidewall and chimney, then hand-sealed with mastic or roof cement.
• A ridge vent paired with soffit vents, or an attic fan on older homes, moves moist air out of the attic so the deck does not rot from underneath.

Roofing Materials We Install on Marin County Homes

Material choice drives both the price and the lifespan you get. We quote the shingle, tile, and metal systems that fit your roof pitch, your framing, and the way fog and rain hit your slope.

• Asphalt shingle is still the default: architectural shingle in a laminated profile, or a lighter three-tab shingle when budget is the deciding factor.
• Wood shake and cedar shake suit older hillside homes, though they need regular care and a fire-rated assembly that meets building code.
• Slate, clay tile, and concrete tile last the longest, but the truss, rafter, and joist framing has to carry the weight, so we calculate that first.
• Metal panel roofing covers standing-seam panel, where screws hide under the seam, and corrugated panel for sheds and outbuildings.
• Flat and low-slope sections get a membrane such as TPO, EPDM, or a PVC membrane, or a built-up roof and modified bitumen where an older tar-and-gravel assembly is due for renewal.
• Beneath all of it sits synthetic underlayment, plus a reflective coating on hot south-facing slopes to cut attic heat and improve energy efficiency.
• We install architectural lines like GAF Timberline, Owens Corning Duration, and CertainTeed Landmark, and register the manufacturer warranty in your name.

Signs Your Roof Is at End-of-Life, Not Just Worn

• Granule loss: shingle granules collect in the gutter and downspout, and the bare mat underneath begins to flake and dry out in the sun.
• Rot and decay in the fascia, soffit, or roof edge, which means water has been wicking backward under the flashing for a while.
• Sag in the roofline or a ridge that has started to settle, which is usually framing rather than surface wear.
• Shingles that curl, buckle, crack, or peel along the eave after a run of winter storms.
• A systemic leak rather than one drip, showing up as several ceiling stains after heavy rain.
• Moss, mold, or dark streaking that holds moisture against the substrate and erodes the surface season after season.
• End-of-life wear: if shingles are brittle and spalling in one area, the rest of the roof is usually on the same clock.

Our Roof Replacement Process, Step by Step

Replacement is scheduled work, not emergency work, so we can plan it around a weather window. Here is how a job runs from the first roof inspection to the final walkthrough.

1. Roof inspection and estimate. We get on the roof, measure in roofing squares of 100 square feet, record the pitch, and photograph the deck. You get a line-item roof estimate, not a lump sum.
2. Permit and staging. We confirm the assembly meets building code, order material, and drop the dumpster the day before so your driveway is clear by evening.
3. Tear-off. Crews work from ladder and scaffold with a safety harness on steep pitches. Pry bars and roofing shovels strip the field, and a nail gun and air compressor speed the deck work.
4. Deck and substrate repair. Rotten sheathing, and any purlin, batten, or counterbatten on tile or metal assemblies, gets replaced before a roll of underlayment covers the decking.
5. Install. Ice-and-water shield at the eaves and valleys, synthetic underlayment over the field, then a starter course, staggered courses up the rake, and a ridge cap. Sealant, caulk, and adhesive go on at every penetration.
6. Cleanup and registration. We haul debris, clear the gutter, magnet-sweep for nails, walk the property with you, and register the manufacturer warranty in your name.

Details We Handle While We Are Already Up There

Replacement is the one time the whole assembly is open, which makes it the cheapest moment to fix the parts that always leak later. We price these as separate line items so you can see what each one adds.

• Skylight and dormer flashing gets reset or replaced, since both sit where the roof plane changes and water stalls.
• Chimney, pipe boot, and vent boot penetrations are re-flashed; pipe flashing typically cracks years before shingles wear out.
• Gutter and downspout runs are cleared and rehung so runoff leaves the roof instead of pooling at the foundation.
• Parapet, scupper, and coping details on flat sections get fresh waterproofing and weatherproofing.
• Hip, gable, and verge edges are detailed with apron flashing and boot flashing where the profile needs it.
• Architectural shapes such as a mansard, gambrel, canopy, awning, or deep overhang are flashed and finished to match the house.
• Snow guard and anchor points are set where you will want safe roof access later.
• Attic insulation and ventilation get checked before the ridge closes, because a vapor barrier question is easier to answer now than in February.

What Roof Replacement Costs in Mill Valley

Price comes down to square footage, pitch, how many layers come off, and how much deck repair is hiding underneath. Hillside lots add labor, since staging a crew on a slope takes longer than a flat driveway.

• Roof size, measured in roofing squares rather than in guesses about the whole house.
• Layers to tear off, plus the dumpster and debris disposal that comes with them.
• Pitch and access: steep planes and narrow hillside lots need more scaffold and safety setup, which is real labor hours.
• Deck and framing repair, from plywood or OSB replacement to rafter, joist, or ridge beam work when a ridge has sagged.
• Material tier: three-tab shingle, architectural shingle, tile, slate, or standing-seam metal panel.
• Add-ons like skylight replacement, gutter and downspout work, fascia and soffit repair, and ventilation upgrades.

We put a range in writing before work starts, and the invoice matches the estimate unless we find something you approve first. What we will not do is quote a real number over the phone without seeing the roof.

Marin County Weather and What It Does to a Roof

Coastal fog and morning moisture keep the surface damp for hours, which is hard on wood and on cheap fasteners. Winter rains from Pacific storms push water sideways into flashing and back under the eaves.

• Fog and morning moisture: constant damp speeds corrosion on nails and screws and flaking on older shingle surfaces.
• Winter rain and wind: atmospheric-river storms drive water past step flashing and chimney flashing, and lift shingles where sealant has already failed.
• Mild temperatures and low snowfall: ice dams are rare here, but a hard freeze right after a wet storm can still dam water at the eave.
• Debris dam removal: needles and leaves pack the valley and the gutter, and a small dam is what pushes water under the eave in January.
• Tree cover: shade keeps a rooftop wet longer, and that is where moss and decay get their start.

We do not steam ice off a rooftop the way crews do in the mountains. That is a cold-climate method, and it damages shingles. The lasting fix for a wet eave is insulation and ventilation, not a torch.

Maintenance, Efficiency, and Greener Roofing Choices

A new roof holds its value when you maintain it and when the attic can breathe. We hand over a short maintenance list at the walkthrough and flag the upgrades that pay you back on utility bills.

• Roof maintenance tips we leave behind: clear the valley and gutter twice a year, and check the chimney flashing after the first big storm.
• Energy efficiency: a reflective coating, a ridge vent running the full ridge, and balanced soffit vent intake all cut attic heat.
• Green roofing: standing-seam metal and some tile assemblies carry recycled content, and both outlast asphalt by decades.
• Sustainability in roofing also means less landfill, so we separate recyclable tear-off material before the dumpster leaves.
• Roofing technology has moved along too, and self-adhered underlayments are why a deck installed today stays tight longer than one from the 1990s.

Warranty, Insurance Claims, and Questions We Hear

Storm damage is usually covered and wear is usually not, so the paperwork matters as much as the shingles. We document the storm date, photograph the damage, and write a line-item scope you can send to your adjuster.

Does a roof replacement trigger an insurance claim?

Roof replacement is covered only when a storm or falling debris caused the damage, not when the cause is wear. An adjuster inspection moves faster with dated photos, a scope of work, and a proof-of-loss form that matches the estimate.

How long does a roof replacement take?

Roof replacement runs one to three days of installation for most homes once material is staged. Tile, deck repair, or steep hillside access adds days, and we tell you that before we start rather than after.

What warranty comes with a roof replacement?

Roof replacement brings two warranties: the manufacturer warranty on materials, which we register in your name, and our written workmanship terms. Ask for both in writing with your estimate.

When is a repair a better answer than a replacement?

Roof repair wins when the roof is young and damage is isolated to a valley or a pipe boot. Replacement earns its cost when the deck, the flashing, and the field are all failing together.