Kentfield Fiber Cement Siding

Fiber cement is a manufactured cladding — Portland cement, fine sand, and cellulose fiber pressed into boards, panels, and shingles. What makes it worth a close look in Kentfield is the combination of two things this valley demands at once: it does not rot when it stays damp, and it does not burn. On a wooded lot on the lower slopes of Mount Tamalpais, in one of the wettest pockets of the Bay Area, few materials answer both of those questions as directly.

Bay Area Siding Company installs fiber cement across Marin from our base a few minutes away in Larkspur. If you already know you want this material, this page is about the category itself — how it behaves, who makes it, and how to choose a line. If you're still weighing it against wood, vinyl, or engineered wood, start with the broader siding replacement overview.

Talk it through with us: call (415) 619-5167 or request an estimate.

Why the material suits this valley specifically

Kentfield's setting works against ordinary cladding. Corte Madera Creek runs through the Ross Valley floor, the tree canopy is dense, and north- and creek-facing walls sit in shade that holds moisture long after a storm passes. Boards that would dry between rains in a sunnier town stay wet here, and that is where rot, mildew, and paint failure start.

Fiber cement is dimensionally stable in exactly those conditions. It doesn't swell and cup the way solid wood or plywood panel siding does when it soaks and dries over and over, and its cement matrix gives insects and fungus nothing to feed on. Paint bonds to it well and holds for a long time, which matters when repainting means staging on a hillside lot.

The second reason is fire. The estate parcels winding up into Kent Woodlands sit in wooded, fire-exposed terrain, and Cal Fire's updated Fire Hazard Severity Zone maps are moving through local review and adoption across Marin. Where a fire-hazard designation lands on a parcel, California Building Code Chapter 7A can shape which exterior materials are allowed — and fiber cement is noncombustible, which is why it comes up so often in that conversation. Whether Chapter 7A applies to your specific home depends on the parcel and the scope of work, so we confirm that with Marin County rather than assume it.

Choosing among fiber-cement brands

"Fiber cement" is a category, not a single product. The manufacturers differ in profile range, finish options, and texture:

• James Hardie — the most widely specified line in California, sold here as the HZ10 product built for our climate zone, with factory ColorPlus finishes. It has its own dedicated page: see James Hardie siding in Kentfield.
• Allura — lap, panel, and shake profiles; a competitive alternative with its own trim and finish system.
• Nichiha — known for architectural panel systems and deep-texture patterns, often chosen for more contemporary elevations.

We'll walk the real differences on-site, because the right pick depends on your home's architecture, whether you want a factory finish or a field-painted one, and how the profile reads against your existing trim and windows.

Honest trade-offs

Fiber cement is heavier than wood or vinyl and it is harder to cut and fasten, so a clean result depends on skilled installation and correct fastening, flashing, and gapping to the manufacturer's instructions — sloppy fiber cement fails at the joints. It costs more up front than vinyl. And on a re-side, the boards are only as good as what's behind them, which is why we don't side over failing material.

How the install goes

On a typical re-side we remove the old cladding down to the sheathing and substrate so the water-resistive barrier and flashing can be inspected and, on older Kentfield homes, often added where none existed. We correct any concealed rot we find, install a proper WRB, detail the flashing at every window, penetration, and transition for a high-rainfall wall, and hang the fiber cement to spec with the gaps and clearances the manufacturer requires. Framing only enters the picture if the sheathing itself has failed. We finish with trim, caulk, paint or touch-up on factory-finished lines, cleanup, and a walkthrough.

Permitting runs through the Marin County Community Development Agency, Building and Safety Division at the San Rafael Civic Center, since Kentfield is unincorporated. If your home is inside Kent Woodlands, the property owners association's design review can also weigh in on profiles and colors — tell us early so we spec within it.

What drives the cost

We price after we've measured and seen the walls, never online. The honest variables are the size and height of the home, hillside access on the wooded lots, how much hidden rot turns up once the wall is open, which brand and finish you choose (factory-finished runs higher than field-paint), whether trim and windows are integrated at the same time, and any County or association review your project triggers.

Frequently asked questions

Is fiber cement a good choice for a Kent Woodlands parcel in a fire-hazard area? It's one of the strongest candidates, because it's noncombustible. But whether Chapter 7A applies to your parcel — and exactly what it requires — depends on your specific fire-hazard designation and the scope of work. We confirm that with Marin County before speccing rather than assuming.

How does fiber cement handle Kentfield's rain and shade? Well. It's dimensionally stable when wet, doesn't feed rot or insects, and holds paint. The performance that matters most, though, is behind it: the water-resistive barrier and flashing, which we detail for a high-rainfall wall.

Is James Hardie the only fiber cement you install? No. James Hardie is the most common request and has its own Kentfield page, but we also install Allura and Nichiha. We'll compare them for your home.

Can you match my home's existing look with fiber cement? Usually. The category offers lap, panel, shingle, and shake profiles, and both factory and field finishes, so we can get close to most Kentfield elevations — from flatland cottages to hillside custom homes.

Get a fiber-cement plan for your Kentfield home

Call (415) 619-5167 or request an estimate. We'll compare fiber-cement lines against the alternatives, weigh them against your exposure and any fire or association review, and lay out the work. See finished projects in our gallery and the wider Marin service area.