Novato and central Marin roof leaks
Six dry months, then a winter of rain packed into a few weeks. If water is coming through a ceiling, skylight or chimney in Novato, call to reach an independent local roofer who can trace it and fix it.
Rainline Marin is a free referral service. Calls are connected with independent, locally operating roofing contractors; we do not inspect or repair roofs ourselves.
Start here
Catch the water, protect what is under it, and get the roof looked at before the next storm in the forecast. Put a bucket and towels under the drip, move furniture and electronics away, and if water is near a light fixture, switch that circuit off at the breaker. Then take dated photos of the stain and the ceiling around it.
Next, note when it leaks. A drip that only appears in wind-driven rain points somewhere different from one that shows in any steady shower, and a leak that started the first week of the rainy season usually means something dried out or filled up over the summer. That detail helps the roofer arrive with the right plan.
Novato's winters are short and heavy. The city averages about 25 inches of rain a year, almost all of it between late October and April, and nearby Mill Valley and San Anselmo get closer to 47. Roofs sit dry and baking for half the year, then take months of rain in a few weeks. That swing is why so many Marin leaks show up all at once, and why a small one rarely stays small.
Roof problems
The roof on a 1960s San Marin ranch, a hillside Mill Valley cottage and a Terra Linda Eichler fail in different ways. Start with the one that sounds like your house.
Marin has well over a thousand Eichler homes, from Terra Linda and the Marinwood "Berries" to Lucas Valley, and many more ranch houses and additions with low-slope sections. Flat roofs leak where water sits: split seams, tired patches, clogged roof drains and the curbs around skylights. Ponding after a storm is the early warning.
Flat roof leaksDrips around a skylight usually come from the flashing or curb, not the glass. Older plastic domes craze and crack, and some "leaks" are winter condensation running off the frame.
Skylight leaksBrick chimneys leak at the step and counterflashing, a cracked crown or a missing cap. Water often shows on the ceiling beside the fireplace or inside the firebox.
Chimney leaksShaded slopes under redwoods and oaks stay damp through the foggy winter. Moss lifts shingle edges and holds water against the roof, while needles and leaves dam valleys and gutters. Gentle removal and a clear path for water stop many leaks before they start.
Moss and debrisAtmospheric river storms bring strong gusts that drop limbs on roofs and lift shingles and ridge caps. Photos first, then a cover, then the repair.
Storm damageWith an open hole and more rain coming, a battened tarp buys time until a dry window. Loose plastic weighted with bricks tends to blow off in the next gust.
Emergency tarpingStorm season
A Gulf or Midwest roof gets wet all year. A Marin roof gets almost nothing from May through October, then most of its yearly rain in a handful of months. Records kept at the old Hamilton Air Force Base show Novato's average year at about 25 inches, and on December 10 and 11, 2014, more than 10 inches fell in a single day.
That pattern explains the timing of most calls. Over the dry season, sun hardens the rubber around vent pipes, sealant at flashing shrinks and cracks, and leaves, needles and dust collect in valleys, gutters and flat roof drains. Nothing shows inside, because nothing is getting wet. The first heavy storm then tests every one of those weak spots on the same afternoon.
Leak checker
Pick the card closest to what you see. It will not replace a roofer's inspection, but it narrows the search and helps you describe the problem on the call.
Curb flashing or a cracked dome, or condensation on cold nights. See skylight leaks.
Flashing where brick meets roof, or a cracked crown. See chimney leaks.
Ponding, a failed seam or a blocked drain on the low-slope roof. See flat roof leaks.
Moss lifting shingles or debris damming a valley. See moss and debris.
Lifted shingles, broken ridge caps or a puncture. See storm and tree damage.
Safety first, then a temporary cover. See emergency tarping.
In depth
Most of Novato was built fast. The city went from under 18,000 people in 1960 to almost 44,000 by 1980, and the tract neighborhoods of that era, from San Marin and Pleasant Valley to Ignacio and Bel Marin Keys, are now on their second or third roof. Each reroof can leave old flashing, extra layers or mismatched details underneath, and those hidden layers are where many leaks begin.
Heat is the next factor. Inland Novato summers are warm and dry, and that cooks the rubber collars on plumbing vents, the mastic around flashing and the surface of flat roof membranes. Toward the bay and up the shaded canyons in southern Marin, the problem flips: fog and tree cover keep north-facing slopes damp, which feeds moss and rots wood shingles.
Then there are the trees themselves. Oaks, bays and redwoods drop leaves and needles all year, and in a dry autumn that debris piles up in valleys and gutters. When the first storm arrives, water backs up behind the dam and runs sideways under the roofing. Add the strong gusts that come with atmospheric river storms, and limbs end up on roofs too.
Water rarely drips straight down from where it gets in. It runs along the underside of the decking, follows rafters and lands on the ceiling feet away. So a good inspection starts inside: the shape and spread of the stain, then the attic, where a flashlight shows the wet trail on the wood leading back uphill toward the entry point.
On the roof, the roofer checks the usual suspects above that trail: vent boots, chimney and wall flashing, skylight curbs, valleys, ridge caps and any lifted or cracked shingles. Flat roofs get a close look at seams, patches and drains. When the source still hides, a controlled water test settles it. One person wets a small section with a hose, starting low and working uphill, while another watches the attic until the drip appears.
Eichler and other flat-roof homes are a special case, because many have no attic at all. The roof is the ceiling. Here the roofer reads the membrane surface, the joints around skylights and the low spots where water ponds, and may use a moisture meter or infrared camera to see how far water has spread under the surface.
Most leaks end in a focused repair: replacing a cracked vent boot, rebuilding chimney counterflashing, resetting a skylight with new curb flashing, patching or welding a flat roof seam, clearing and sealing a drain, or replacing a few shingles and sealing the course above. If the decking under the entry point has gone soft, that section is cut out and replaced before the roofing goes back on.
Larger jobs bring in local rules. Novato's municipal code requires fire-resistive roofing for reroofing in the city's mapped high fire hazard areas, and Marin County requires a Class A roof covering for repairs and replacements in its wildland-urban interface areas, with the whole roof covered by that rule once more than half is replaced within a year. Ask the roofer whether your job crosses any of those lines, and check with the city or county building division about permits before larger work begins.
Book inspections in the dry months. A roofer in July can walk a dry roof, clear the valleys and replace tired vent boots before the first storm, instead of chasing a leak in the rain in December.
From the call to a dry ceiling
Four steps, and you decide at every one of them.
Say which town you are in, what kind of roof you have if you know, and where the water is showing. Your call is routed to a roofer who works in your area.
Expect to be asked when it leaks, how long it has been going on, and whether water is anywhere near wiring or light fixtures.
The contractor looks at the roof and the attic or ceiling, explains the cause and puts the proposed work in writing before starting.
If you hire them, they fix it. Look at the spot again during the next good storm to be sure it stayed dry.
The cost of waiting
Because the wet season is short, a leak that starts in November gets soaked again and again before spring. The decking under the gap never fully dries between storms, so it softens, the nails around it rust and loosen, and the opening grows from below. By March a simple vent boot job can become a section of new decking.
Inside, wet insulation packs down and stops working, and it holds moisture against the drywall so the stain keeps spreading. On a flat Eichler roof, water can travel along the tongue-and-groove ceiling boards and show up in a different room. Wood that stays damp for weeks also invites mold and rot, which turns a roof repair into an interior one.
There is a paperwork side as well. Many homeowner policies treat long-term seepage differently from sudden damage, so a leak that ran all winter is harder to claim. Photos, dates and a prompt inspection keep more options open.
Turn that circuit off at the breaker before you place buckets, and keep people out from under a ceiling that is bulging or sagging. Wet drywall can come down without warning.
Moss, wet shingles and needles make roofs slick in the rain. If a cover is needed, work from inside the attic where you can, or leave emergency roof tarping to a roofer with fall protection.
Scope of the job
Two leaks that look alike from the ceiling can be very different jobs. These are the things a roofer weighs when scoping the work.
| Factor | How it changes the job |
|---|---|
| Roof type | Composition shingle, flat membrane, tile, wood shake and metal each need their own materials and methods. |
| Pitch and access | Steep hillside roofs and tight lots under trees need more safety setup and staging. |
| Number of entry points | One cracked boot is a short visit; several failed flashings or seams take longer. |
| Deck condition | Soft or rotted decking under the gap has to be replaced before new roofing goes on. |
| Fire-area rules | In mapped fire hazard areas, larger reroofs may need Class A materials and vent upgrades. |
| How long it leaked | A leak that ran all winter brings insulation, ceilings and sometimes framing into the scope. |
| Weather window | Permanent repairs need dry, calm days, which can be scarce from December to February. |
Areas
The line covers Novato and five nearby cities. Each area page has the local detail.
From San Marin and Pleasant Valley below Mount Burdell to Ignacio, the Bel Marin Keys lagoons and the newer homes on the old Hamilton air base, Novato mixes 1960s tract roofs with 2000s builds. Older neighborhoods leak at layered flashing; newer ones at installation details.
The county seat holds hundreds of Terra Linda Eichlers and the historic houses of Gerstle Park, so flat roofs and old chimneys both keep roofers busy. Read about roofers in San Rafael.
Victorian homes on the west side of the river came through 1906 largely intact and still wear complex roofs with many valleys. See the notes on Petaluma roof leaks.
Redwood canyons on the slopes of Mount Tamalpais mean shade, fog and nearly twice Novato's rain, which is hard on wood shingles and gutters. Details for Mill Valley roofs.
Much of town sits on the San Anselmo Creek floodplain, and its older homes pair heavy winter rain with mature trees over the roof. More on roof leaks in San Anselmo.
Old Downtown Larkspur is on the National Register, and the homes up Madrone Canyon sit in a redwood grove along Larkspur Creek. Find out what matters for Larkspur roofs.
How it works
Rainline Marin is a free referral service for homeowners. When you call the number on this site, you are connected with an independent, locally operating roofing contractor who serves your part of Marin or Petaluma. Nobody at Rainline Marin climbs ladders, writes repair scopes or holds a roofing license; the line exists only to get you to someone who does.
The contractor you speak with runs a separate business. They set their own schedule, inspect the roof, give you their scope of work and carry out any job you agree to, and your agreement is with them rather than with this site.
That makes a few questions worth asking on the call. Ask for their California contractor license number so you can look it up with the Contractors State License Board, ask about liability insurance, and ask whether your job needs a permit or fire-area materials. A solid roofer answers all of that plainly.
What to have ready
Questions
Short answers to what people ask most, from first-storm leaks to fire-area roofing rules.
No. Rainline Marin is a referral line. Your call is connected with an independent local roofing contractor, who inspects the roof and does any work you agree to.
Months of dry heat crack sealants and rubber vent boots, and leaves and needles pile up in valleys and gutters. The first heavy rain finds those weak spots all at once.
A leak lines up with rain and with something on the roof above, such as a vent, chimney, skylight or valley. Condensation shows up on cold mornings, often across a wide area of the attic, and can happen on dry days.
Many flat roof leaks are local: a split seam, a failed patch, a clogged drain or a worn skylight curb. A roofer can tell from the membrane's condition whether a repair or a new roof makes more sense.
In mapped high fire hazard areas, reroofing generally has to use fire-resistive roofing, and in Marin's wildland-urban interface that means Class A. Ask the roofer and your city or county building division what applies at your address.
No. Pressure washing strips granules from shingles and can drive water under them. Moss is removed gently by hand or with a soft treatment, ideally by a roofer on a dry day.
Keep everyone away from the area under the impact, stay clear of any downed lines and call 911 if the structure looks unsafe. Then photograph the damage and arrange a temporary cover before the next rain.
Roofers can often look inside, check the attic and set up a temporary cover when it is safe, but permanent repairs wait for a dry, calm window. Availability depends on the contractor.
Novato, San Rafael, Mill Valley, San Anselmo and Larkspur in Marin County, plus Petaluma just north in Sonoma County.
Calling the line is free. Any inspection or repair is arranged directly between you and the contractor, so ask them about their terms before work starts.
Rain getting in?
Rainline Marin is a free referral line. Your call goes to an independent, locally operating roofing contractor, who does the inspection and any work.
