Roof Replacement in Mill Valley, CA

What Roof Replacement Involves

roof replacement is the process of stripping your existing covering down to the roof deck, inspecting the sheathing for rot and decay, and installing a new, complete roof system. It solves the problem patching cannot: end-of-life wear across the whole rooftop.

We begin with a roof inspection rather than ladder guesswork. We walk the roof, photograph the flashing condition, check the attic for moisture content, and write a roof estimate line by line.

The Layers That Make Up a New Roof

• Ice-and-water shield is a self-adhered membrane rolled along the eave and through the valley, where ponding water and ice dams cause the worst damage.
• Synthetic underlayment replaces old roofing felt, tar paper, and asphalt-saturated felt across the field of the roof.
• Drip edge caps the eave and rake so runoff clears the fascia instead of wicking back into it.
• Step flashing and counter-flashing seal the roof where it meets a sidewall, while chimney flashing, apron flashing, and boot flashing handle a chimney, a pipe boot, or a vent boot.
• Ridge cap shingles finish the ridge, and a ridge vent paired with a soffit vent keeps the attic breathing.
• A starter course along the eave locks down the first field course so wind uplift cannot get a grip.

Roofing Materials We Install

Material choice drives lifespan, weight, and cost. We install the major residential roofing types and will tell you which one suits your pitch and framing.

• Asphalt shingle roofs dominate here; architectural shingles cost more than three-tab and last longer, and both are far lighter than tile or slate.
• Wood shake and cedar shake suit older homes but need re-coating and more frequent maintenance in our damp air.
• Slate, clay tile, and concrete tile bring a 50-year horizon but may require the rafter, joist, and truss framing to be reviewed first.
• Metal panel roofing, including standing-seam panel and corrugated panel, clips to purlins over a batten or counterbatten and sheds rain fast.
• Flat and low-slope sections take a membrane such as TPO, EPDM, or a PVC membrane, or a built-up roof like the old tar and gravel assembly, capped with modified bitumen.
• Roof pitch drives the choice, and shingle lines you will see quoted around here include GAF Timberline, Owens Corning Duration, and CertainTeed Landmark.

What We Find Under the Shingles

Half of a replacement job lives below the surface. The substrate tells the real story, and we will not shingle over a problem.

• Plywood or OSB sheathing that has softened through water intrusion gets cut out and replaced before anything new goes down.
• A sagging roofline often means a rafter, ridge beam, or purlin has taken on water for years.
• Granule loss, curled or buckled shingles, blistering, and alligatoring all point to a covering past its service life.
• Mold, moss, and dark streaking on the north side usually trace back to ventilation problems, not shade alone.
• Gutters and downspouts pulling away from the fascia are a flashing and drainage issue, so gutter services belong in the same conversation.

Roofline Details That Change the Job

• A dormer, a gambrel, or a mansard roof means cut-up planes and more flashing per roofing square.
• Hip roofs and gable roofs handle wind differently, so verge and rake details get different fastening.
• A chimney, skylight, or parapet needs counter-flashing and a coping detail that ties cleanly into the wall.
• A canopy, awning, or wide overhang needs staging planned before tear-off day, not on it.

Choosing a Roofing Contractor

Any roofer can hand you a number. A good one explains what sits behind it. Ask these questions before you sign anything, and make the Mill Valley roofing contractor walk the roof with you.

• Ask whether the roof estimate is a line-item bid covering tear-off, dumpster, and debris haul-away.
• Ask how they handle decking found rotten after the tear-off, and what that adds per square.
• Ask who pulls the permit and how they verify building code compliance for ventilation and fastening.
• Ask which fasteners they use, ring-shank nails or screws, and whether the crew hand-seals flashing beads or leans on mastic alone.
• Ask for proof the crew is licensed and insured before the first shingle comes off.

What Drives the Price of a Roof Replacement

We price by line item, because two houses the same size can differ by thousands of dollars. Here is what actually moves the number.

• Roof size and pitch: a steep hip or mansard roof needs more labor and staging than a low gable.
• Layers: a single tear-off is faster than stripping three old roofs, and an overlay or recover changes the whole scope.
• Decking: replacing plywood sheathing or OSB adds material, labor, and dumpster space.
• Details: dormers, valleys, skylights, a chimney, a parapet, or a scupper on a flat section all add time.
• Material: architectural shingles, standing-seam panels, and slate sit at very different price points.
• Access: a tight lot may need a scaffold, ladder staging, and a lift to swing material over a canopy or awning.

Insurance Claims and Warranty Registration

Storm damage repair is often covered, but the paperwork decides the outcome. We document the storm date, photograph every damaged slope, and meet your adjuster on the roof during the inspection.

When the work is finished we register the manufacturer warranty on your new system and hand you the paperwork. That registration belongs to you, and it is the part most homeowners never see.

One honest note: if a repair buys you five more years, we will say so. Replacement is the right answer when the covering is failing across the whole rooftop, and we will tell you when it is not.

Energy Efficiency, Ventilation, and Green Roofing

Ventilation is the quiet part of a roof. Ridge vents, soffit vents, and a balanced attic fan cut heat and moisture, which is what actually extends shingle life.

• Reflective shingles and a white roof coating lower attic temperatures through the summer.
• Proper attic insulation and a vapor barrier keep warm, moist air from condensing on the underside of the deck.
• Recycling torn-off asphalt shingles and choosing a longer-life material keeps tonnage out of the landfill.
• Maintenance tips that matter: clear debris from valleys, keep gutters and downspouts flowing, and re-caulk exposed fasteners and sealant joints each fall.

Fog, Rain, and Mount Tam Weather

Roofs here live in a wet, foggy microclimate. Morning moisture off the Pacific sits on the rooftop, then heavy winter rains test every flashing detail. We serve Mill Valley and the surrounding Marin neighborhoods.

• Ice dams are rare locally, but cold air on an eave can still freeze runoff into a dam at the gutter line.
• Constant damp speeds up rot, decay, and corrosion on fasteners, anchors, and snow guards.
• UV degradation fades a south slope even while the north side stays green with moss.
• Sheltered lots near Muir Woods and the Golden Gate National Recreation Area hold moisture longer, so waterproofing matters more.

Tools You Will See on the Job

• A roofing shovel and pry bar strip old shingles without tearing up the decking.
• An air compressor and nail gun drive fasteners at the right depth so nothing gets overdriven.
• A roofing square keeps courses straight and the stagger consistent across the field.
• A safety harness, ladder, and scaffold go up before the dumpster arrives on a steep pitch.
• A torch, mastic, and roof cement hand-seal the modified bitumen seams and adhesive-backed details a roller cannot reach.

Roof Replacement Questions We Get Asked

How long does a roof replacement take?

Roof replacement usually takes one to three days on a single-family home once materials are on site and the weather cooperates. A steep pitch, a heavy tear-off, or extra sheathing repair can add a day.

Can new shingles go over the old ones?

Roof replacement with an overlay is possible on some homes, but it hides deck problems and adds weight. We usually recommend a full tear-off so the sheathing can be inspected.

Will insurance pay for it?

Insurance claim assistance helps when the damage traces to a covered storm rather than age. We document the storm date and the damage so the adjuster sees the scope clearly.

Do you handle gutters while the roof is open?

Roof replacement is the right moment for gutter installation, since the drip edge and fascia are already exposed. We can tie new gutters and downspouts into the same scope.

What happens to the old shingles?

Roof replacement produces a lot of debris. We stage a dumpster on site, load the tear-off daily, and run a magnet across the lawn and driveway before we leave.