Roof Inspection in Mill Valley, CA

What a Roof Inspection Covers on a Hillside Mill Valley Home

A roof inspection is a full examination of the entire roofing system, not a glance at the shingle field from the driveway. Fog rolls off the Pacific most mornings, and the first atmospheric river in November finds every weak point on a Mill Valley rooftop.

• Roof deck and sheathing: soft spots in plywood or OSB show up when we walk the decking and probe it with a pry bar.
• Shingle field: asphalt shingle, architectural shingle, and three-tab shingle each wear differently, so we log granule loss, curl, and missing shingle by location.
• Flashing at every penetration: step flashing, counter-flashing, apron flashing, chimney flashing, and the pipe boot around each plumbing vent.
• Ventilation stack: ridge vent, soffit vent, and attic fan performance, plus insulation depth in the attic, because a damp attic rots rafters from the inside out.
• Edges and drainage: drip edge, eave, rake, valley, gutter, downspout, fascia, and soffit, where end-of-life wear almost always shows up first.
• Framing under the surface: truss, rafter, joist, and ridge beam, along with any purlin, batten, or counterbatten carrying a tile or metal system.

Everything lands in a written report with photos attached, so a buyer, a seller, or your own insurance adjuster reads the same findings we recorded on the rooftop.

How We Run the Inspection: Drone Imagery, Moisture Meter, Infrared Scan

A roof inspection starts on the ground with a ladder and a full walk-around, then moves up top where the pitch allows. Steep rooftops get a safety harness. Taller hillside homes get drone imagery of the ridge and valleys we cannot safely stand on.

Then we test rather than guess:

1. We sweep a moisture meter across ceiling drywall and attic rafters to find where water is actually sitting.
2. We run an infrared scan on vaulted ceilings to catch a leak that has not stained the paint yet.
3. We lift a shingle at suspect spots to check fastener length, spot overdriven nails, and confirm the underlayment type.
4. We photograph every defect: spalled tile, corroded metal panel edges, a cracked vent boot, sealant peeling off a skylight curb.
5. We compile the findings into a line-item written report with a priority order and a roof estimate for each item.

Roofing Materials We Find in Mill Valley, and How Each One Fails

A roof inspection usually turns up several material types on the same Mill Valley home, and each one fails in its own way. Here is what we actually find up there.

• Wood shake and cedar shake: beautiful under the redwoods near Muir Woods National Monument, but they rot and split where shade keeps them wet past noon.
• Slate, clay tile, and concrete tile: the tile can outlast the house, yet the fasteners and roofing felt beneath it decay decades earlier.
• Metal panel, standing-seam panel, and corrugated panel: exposed fasteners back out, and the sealant washer under each screw dries, cracks, and seeps.
• Membrane and flat systems: TPO, EPDM, PVC membrane, built-up roof, and modified bitumen blister or pond where a scupper clogs with debris.
• Legacy layers: old tar and hot-mopped bitumen, asphalt patch, mastic, and roof cement tell us someone chased leaks instead of fixing them.
• Ice-and-water shield and vapor barrier: when these are missing at the eave, wind-driven rain wicks sideways under the courses.

Components We Check at Every Edge, Penetration, and Transition

A roof inspection spends most of its time at the edges and transitions, because water rarely comes through the middle of a field course. This part of the checklist carries the most weight in our report.

• Skylight and dormer curbs: a curb that has settled leaves a gap no caulk can bridge for long.
• Chimney and masonry: counter-flashing and roof cement have to work together, or the chimney draws water straight into the attic.
• Valley and hip lines: on a gable, gambrel, or mansard roof, two planes meet and every leaf in the county collects there.
• Parapet, coping, and scupper: on flat commercial roofing, ponding water sits until the membrane delaminates.
• Canopy, awning, and overhang framing: checked for sag where a fastener has pulled loose from the substrate.
• Roof-to-wall transitions: step flashing and a waterproofing membrane have to lap in the right order, or the overlap becomes a funnel.
• Soffit and fascia behind the gutter: rot starts quietly, and the first visible sign is paint flaking off the trim.
• Boot flashing at every pipe: the rubber collar cracks long before the shingle around it ever fails.

What a Roof Inspection Costs in Mill Valley

Roof inspection pricing is a flat fee quoted before we climb, and we credit part of it toward the repair when you hire us for the work. Pre-purchase jobs cost more because the report runs longer and the buyer usually needs it fast.

• Annual maintenance inspection on a single-family roof: one flat fee, scheduled during the dry months.
• Pre-purchase inspection for a buyer or agent: higher fee, photo-documented written report, typically delivered the same day.
• Post-storm inspection after winter rains: flat fee, and the photo set doubles as claim evidence.
• Roof repair or roof replacement estimate: free, and separate from the inspection fee.
• Roof coating evaluation on a flat roof: included with the inspection at no extra charge.

Buildings over two stories, roofs steeper than 8:12, and homes with multiple roofline levels take longer on site, so we quote those individually. Nobody gets a surprise invoice.

Roof Repair, Roof Replacement, and Storm Damage: Reading the Findings

A roof inspection separates what needs a roof repair now, what needs watching, and what is purely cosmetic. A report that recommends a roof replacement without evidence is a sales document, and we do not write those.

When we do write up a roof replacement, it is because the decking has gone soft in several areas or the underlayment has failed beneath a recover or overlay.

That job is a tear-off down to the sheathing, self-adhered ice-and-water shield in the valleys, synthetic underlayment across the field, and shingles set with ring-shank nails into a starter course with staggered courses above it.

Storm damage gets documented section by section. Wind uplift bruises a shingle without tearing it, and hail damage leaves dents you only see in raking light. Both matter to an insurance claim.

Roof Maintenance Tips, Energy Efficiency, and Insurance Claims

A roof inspection is only worth the fee if you act on it, so here is the short list we hand homeowners at the end of every visit.

• Clear debris from the valley and behind the chimney after every storm, because wet needles hold water against the flashing.
• Flush the gutter and downspout in October, before the first Pacific storm, not after the first brown ring on the ceiling.
• Trim limbs back off the roofline; moss and algae start in shade and creep across the field course.
• Look in the attic after heavy rain. A damp joist or soggy insulation tells you more than the shingle surface will.
• Reseal caulk and sealant at counter-flashing and skylight curbs every few years, before it peels and lets water in.
• Ask about a reflective roof coating or cool-rated shingle if the upstairs bakes in July; energy efficiency starts at the roof, and a coating extends a flat roof's life instead of sending it to a dumpster.

We inspect residential roofing and commercial roofing across Alto, Cascade, Homestead Valley, Muir Beach, and Strawberry, from Mill Valley Downtown Plaza out toward the Golden Gate National Recreation Area. An ice dam is rare at this elevation, but above the fog line we have handled ice dam removal with steam rather than a pry bar, because chopping steam ice off a roof tears the mat and costs more than the ice did.

Marin County building code and Title 24 energy rules shape what we can put back. As a licensed & insured roofing contractor, we bring in HAAG or IICRC-certified inspectors when a claim needs an independent read, and we will say plainly when filing a claim is not worth it.

Frequently Asked Questions About Roof Inspection

How often should a Mill Valley roof be inspected?

A roof inspection should happen once a year, ideally in late summer before the rains, and again after any major winter storm. Coastal fog keeps roofs damp for months here, so annual maintenance catches small failures before they reach the sheathing.

Will an inspection tell me whether I need a roof repair or a full replacement?

A roof inspection answers that with evidence: fastener condition, underlayment type, deck softness, and how much of the field sits at end-of-life wear. When damage is isolated to flashing or a handful of shingles, a repair is the right call.

Do you inspect flat and commercial roofing too?

Roof inspection work covers low-slope systems as well, including TPO, EPDM, PVC membrane, built-up roof, and modified bitumen. We examine seams, ponding, scuppers, and coping, since flat roofs fail at the details rather than the field.

Can I use the written report for an insurance claim?

A roof inspection report with dated photos makes an insurance claim far easier to support. We document the storm date, the affected slopes, and each damaged component so your adjuster sees the same evidence we recorded on site.

How long does it take, and when do I get the report?

A roof inspection on a typical single-family home takes about an hour on site, longer on steep or multi-level rooftops. The written report with photos and a roof estimate usually reaches you the same day or the next morning.