James Hardie Siding in Larkspur, CA

The canyon is both a wet sponge and a chimney

Baltimore Canyon's redwoods keep walls damp long after the air dries, and the narrow corridor funnels and speeds fire when it comes. The assembly has to answer both: a genuinely drying-capable plane behind Class A board, with hardened eaves and vents detailed for accelerated, channeled ember exposure rather than open-hillside exposure. The canyon shape changes the spec, not just the fire rating.

Magnolia Avenue is the other Larkspur

Down along the Magnolia corridor and the historic downtown, the job inverts to heritage fidelity — faithful profiles and trim on protected character homes where canopy damp, not fire funneling, is the main durability driver. Same town, two very different scopes; we're explicit about which a given home is.

Down by the ferry, the water table writes the spec

The bayside pocket of Larkspur near the ferry landing and Larkspur Landing sits low, close to the marsh edge and the tidal reach of Corte Madera Creek. That ground behaves nothing like the redwood canyon above it. Here the issue is humidity that never fully lifts, salt-tinged air drifting in off the bay, and a high water table that keeps the lower courses of a wall under near-constant moisture pressure. James Hardie board shrugs off the rot and swelling that would punish wood lap siding in this spot, but only if the assembly behind it is built to drain and dry. That means generous ground clearance on the bottom course, kickout and step flashing wherever a roof meets a wall, a drainage gap behind the planks, and ColorPlus or a marine-grade finish chosen with the salt exposure in mind. Skip the rainscreen detail on a low bayside lot and you trap the very moisture the product was meant to outlast. The flatwork is easier than the canyon, but the water management has to be more deliberate, not less.

Getting Hardie onto a hillside lot is half the job

Fiber cement is heavy and it ships in long planks, and many of Larkspur's most sought-after homes sit on lots that fight you on both counts. The hillside parcels climbing out of Baltimore Canyon are reached by narrow lanes, blind switchbacks, and driveways too steep or short for a delivery truck to back into. Planning a James Hardie job at those addresses starts with figuring out where the material actually lands, how it gets carried or lifted to the upper elevations, and where staging and cutting can happen without choking a one-lane road that neighbors and emergency vehicles both rely on. The cut stations matter too, since scoring fiber cement releases silica dust, so we set up dust-controlled cutting well away from open windows and the creek corridor on the canyon floor. Layer in Marin's design-review expectations and a tight building envelope, and the timeline on a hillside home is governed by access and site protection, not by how quickly a crew can hang board. Sorting that out before the trucks arrive is what keeps a Larkspur project from stalling on day one.

James Hardie Siding for Larkspur homes

The full james hardie siding approach — materials, weather-resistive detailing, and the manufacturer standards we install to — is covered on the main service page, then specified for Larkspur's conditions on this one.

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Our Larkspur process