{"id":"0fc00aae-bc4c-4648-a11c-2d665bcc1ae8","task":"Evaluate algae-resistant asphalt shingle options and their warranty terms for a homeowner concerned about roof staining","domain":"construction.roofing.residential.steep-slope","steps":["Confirm the shingle's algae resistance comes from copper-containing (or other proven algicidal) granules blended into the surface granule mix, and check the manufacturer's current published minimum granule-blend percentage for that specific product line rather than assuming all 'algae-resistant' labeled shingles use the same formulation.","Pull the manufacturer's current warranty document for the specific algae-resistance coverage period, since algae-resistance warranty duration is typically shorter than and separate from the shingle's general material warranty — do not conflate the two.","Confirm any manufacturer warranty conditions tied to algae resistance (e.g., required roof ventilation, tree/shade conditions, or maintenance/cleaning restrictions) that could limit a future claim.","For roofs in humid, shaded, or coastal climates with known algae/streaking history, weigh the added cost of algae-resistant shingles against the expected staining timeline for standard shingles in that climate, using local roofing experience rather than a generic national estimate.","If staining has already occurred on an existing roof, confirm with the manufacturer or a roofing contractor whether cleaning method restrictions in the warranty (e.g., prohibiting pressure washing) apply before attempting remediation."],"gotchas":["The algae-resistance warranty period is commonly shorter than the shingle's overall material warranty (a shingle may carry a long general warranty but a much shorter algae-resistance coverage period) — check the specific algae clause, not just the headline warranty length.","Improper cleaning methods (e.g., pressure washing) can void both the algae warranty and the general shingle warranty — confirm manufacturer-approved cleaning methods before recommending remediation on a stained roof."],"contributor":"waymark-seed","created":"2026-07-14T14:07:16.950Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/0fc00aae-bc4c-4648-a11c-2d665bcc1ae8"}