Underwriting Factor

How Carriers See Your Roof, Material by Material

Underwriters read roofs the way mechanics listen to engines. Before anyone prices your policy, someone has decided what your roof is made of, how old it is, and what that means for fire and water risk. Here's the material-by-material verdict — and what it means when you re-roof.

Updated July 2026 · 8 min read · Reviewed by a licensed broker, CA DOI Lic. #6013787

The verdicts, one table

MaterialFire viewWhat underwriters flag
Composition shingleClass A as an assembly — the market's default yesAge, curling, granule loss; ACV schedules on older installs
Concrete / clay tileExcellent surface fire ratingThe underlayment beneath ages even when tile doesn't; open ends need birdstops
Metal (standing seam)ExcellentFew — occasionally hail/denting questions inland
Wood shakeThe problem child, especially in brush zonesMany carriers decline or surcharge; treated/rated shakes only partly help
Flat / low-slopeFine when membrane is ratedPonding, drainage, membrane age — water more than fire

Two themes run through every row: fire rating (a Class A assembly is the anchor of any hardening story) and water reliability (most roof claims are leaks and storm damage, not flames). A roof that scores well on both is the single friendliest fact a California application can contain.

The shake problem, stated fairly

Untreated wood shake is combustible roofing in a state that burns — in brush-mapped areas many carriers simply won't write it, and others price it like the exposure it is. Fire-retardant-treated and Class-rated shake products exist and help at the margin, but the market's direction is unambiguous. If you own a shake roof in a WUI area, the honest options are: a specialty/E&S placement while it lasts, or a re-roof that transforms both your risk and your market access in one project. We'll price both paths so the decision is a comparison, not a guess.

Tile's quiet secret: the underlayment

Tile itself outlives mortgages, which lulls owners into thinking the roof is eternal. Underneath, the waterproof underlayment has a working life measured in decades, not centuries — and when it fails, water finds the living room while the tile still looks perfect. Underwriters know this, which is why a fifty-year-old tile roof gets age questions the owner finds insulting. A lift-and-relay (same tile, new underlayment) resets the clock and reads as a re-roof on applications. How roof age is scored →

The re-roof payoff

A documented re-roof — permits, contractor invoice, completion date — improves fire scoring, resets ACV-schedule exposure back to replacement-cost treatment with many carriers, and reopens markets that decline old roofs. On older homes it's routinely the highest-leverage single project at quote time. Tell the wizard your roof's real year; tell your broker the day the new one is done.

Your roof, priced

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Choosing a replacement with insurance in mind

If a re-roof is coming anyway, let underwriting cast a vote: a Class A assembly (comp, tile, or metal), ember-conscious details while the crew is up there — vents, edges, gutter protection — and permits pulled so the project exists on paper. In brush areas, pairing the new roof with Zone 0 cleanup is the combination that moves market tiers. Keep every document; the roof section of the application stops being a liability and becomes the lead exhibit.

Frequently asked

Does roof material change my premium much?

Material, age, and condition together are one of the heavier-weighted property factors — and in brush zones, material can decide eligibility outright. The spread shows up when we quote the same house across carriers. The eight levers →

My tile roof was flagged but the tiles are perfect. Why?

Almost certainly the underlayment's age, or slipped/cracked tiles and open birdstop gaps visible from the street. A roofer's written assessment (with photos) often resolves it. Handling inspection flags →

Do solar panels cause problems?

Panels are insurable and common; carriers mostly care that the mounting was permitted and the roof beneath has life left. Re-roof first, then panels — the other order gets expensive.

Keep reading
Roof age & the 20-year line Home hardening RCV vs ACV Older homes Wildfire insurance
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