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Practical, local advice on roof maintenance, repair, and replacement — written for Seattle's specific climate and housing stock, not generic national advice.
Five scored indicators - granule loss, the flexibility test, curling, exposed mat, and realistic Seattle service life - that put you within a few years.
Buyers price uncertainty pessimistically. Why documenting the roof months before listing beats discovering problems under contract with a closing date.
Visual, non-invasive, readily accessible - three words that define the scope. The six things that fall outside it and how to cover them deliberately.
Squares vs square feet, the thirteen line items that should appear, the six phrases that signal unpriced scope, and how to normalise three bids.
Six touchpoints a year aligned to the weather that actually happens here - inspect in early autumn, treat moss in shoulder seasons, do the work in summer.
The 1:150 and 1:300 ratios worked with real numbers, why net free area is far smaller than the hole, and how to count what you actually have.
Ventilation is a circuit. Add exhaust without intake and the makeup air comes from your heated house, pulling the exact moisture that caused the problem.
CFM sizing, why duct length and flex kill capacity, why uninsulated duct drips and gets blamed on the roof, and the two termination failures we find constantly.
Insulation slows conduction; it does almost nothing about air moving through your ceiling. How to read the dust stains that map your leaks, and the safety limits.
No attic, isolated rafter bays, and an accidental hybrid assembly created by an insulation upgrade. Why the damage is found late and what the real fixes are.
Dormant moss absorbs nothing. The two productive treatment windows in Seattle, why summer applications are wasted, and why you should treat then leave it alone.
The chemistry, the coverage limitation nobody mentions, the installation error that makes them useless, and what they will and will not do.
Shade, debris, moisture, and abrasion in one problem. Clearance targets, which species matter most, and the Seattle tree regulations you must check first.
Aspect, canopy geometry, pitch, surrounding structures, and material. Five variables that explain why identical houses get completely different outcomes.
The pressure question is disqualifying on its own. Plus brush direction, product timing, runoff responsibility, insurance, and what they found up there.
600 gallons per inch of rain per 1,000 square feet. Why six-inch gutters buy debris tolerance rather than capacity, and why downspout count beats gutter size.
Splash blocks are not drainage. Distance, grade direction on Seattle's sloped lots, tightlines and cleanouts, and the stormwater rules worth checking first.
From debris accumulation to structural rafter tail repair, with the intervention point and cost implication at each stage. Preventable until the last one.
Why needles defeat products designed for leaves, the five types ranked honestly against fir and cedar, and the attachment question that affects your roof warranty.
An ice dam is a heat-loss diagnostic, not a weather event. Why our roofs lack eave membrane, what not to do during a freeze, and the permanent fix.
Those dark streaks are a cyanobacterium feeding on limestone filler, not dirt. What actually works, and why pressure washing does not.
Why cedar delivers 20 to 30 years here rather than the advertised 30 to 40, and the ventilation detail that decides which end you get.
Rings, straight lines, colour, and texture decoded, plus the pencil-and-date trick that tells you whether a leak is still active.
Where a low bid usually gets its number, and what six common scope omissions actually cost across two roof cycles.
Cracked crowns, missing caps, failed mortar joints, and spalling brick all leak like flashing failures. How to tell them apart before paying to reflash.
The questions that turn the one un-priceable part of a re-roof into a defined number, including the unit rate clause that protects you.
Four ways to count your roof's shingle layers without getting on the roof, and why the answer changes which quotes are legitimate.
What Seattle's 150+ rainy days a year actually do to a roof over time, and how local roofing systems are designed to handle it.
The bottom-up isolation method, dwell times, the two-person setup, and the six mistakes that make a water test tell you nothing useful.
Sustained Puget Sound wind fatigues the adhesive strip holding each shingle down. The roof looks perfect, leaks a year later, and the claim looks like wear.
Why a missing hand-sized flashing sends concentrated runoff into your wall cavity with no ceiling stain to warn you, and how to check yours in five minutes.
Six steps to tell a roof leak from attic condensation before anyone quotes, including the nail-tip test and the humidity threshold that matters.
The honest answer on metal roof noise in Seattle, including the vaulted-ceiling caveat the standard reassurance leaves out.
Why moss is one of the most common causes of premature roof failure in Seattle, how it spreads, and what actually works to remove and prevent it.
Why shingled valleys trap needle debris into water-damming mats in Seattle, and the five valley specs that matter more than the construction method.
The three-distance method, metadata, physical evidence, and the annual fifteen-minute habit that answers the pre-existing damage argument before it starts.
Why irreversible edge swell matters more in Seattle than elsewhere, the honest case for OSB, and the three specs that matter more than either.
A twenty-minute attic inspection any homeowner can do: what raking light reveals, how to follow water tracks uphill, and the two defects almost everyone finds.
One line on your declarations page can swing a roof payout by five figures, and many carriers move older roofs to depreciated coverage at renewal without anyone noticing.
Roofing works by overlapping geometry, not adhesion. Why sealant fails in two to four seasons here, and why hiding the defect costs more than the leak.
The Seattle failure where moisture comes from inside the house, why our mild winter hides it, and the fix sequence in order.
Scope by component, the decking clause, lien releases, payment structure, and the verification most homeowners skip.
How to use Seattle's public permit history to learn a roof's real age, whether prior work was permitted, and which other records affect the roof.
ASTM D3161 vs D7158 decoded, why the citywide wind figure misleads, and which Seattle addresses genuinely need the upgrade.
Percentage deductibles, the marginal zone where filing costs more than it pays, non-renewal risk, and the four situations that override the arithmetic.
Why pre-1950 Seattle homes sit on spaced boards, why asphalt cannot use them, and how to find out in ten minutes before you get quotes.
In a Seattle winter, water on a skylight frame is often condensation, not a leak. Five ways to tell, and what each diagnosis actually costs to fix.
The neighbour anchor, the free inspection, the deductible offer, and assignment of benefits, decoded. Plus the fifteen minutes of verification that settles it.
Why shingles below 2:12 are an installation error, where membrane roofs actually fail, and what ponding means in a climate that never dries.
Why the rubber collar fails at half the roof's life, why the damage is disproportionate, and the access economics that should change when you replace it.
Leak paths change when insulation settles or debris shifts. Rafters vs trusses, ductwork as an aqueduct, and why a new stain often means the same old leak.
Decking is the one thing nobody can price in advance. Four tests that separate a legitimate change order from a manufactured one.
