{"id":"7896d6a6-eb5b-4e36-a704-2429247b2b6c","task":"Apply CSSB grading rules and fire-code restrictions when specifying a wood shake or shingle roof","domain":"construction.roofing.residential.steep-slope","steps":["Confirm the wood shakes/shingles carry a current Cedar Shake & Shingle Bureau (CSSB) Certi-label grade stamp (Certi-Split/Certi-Sawn for shakes, Certigrade for shingles) rather than assuming ungraded or unlabeled wood roofing meets code.","Identify the grade (premium, #1, #2, or #3 for shakes; similarly graded for shingles) required by the project specification or local code amendment, since lower grades may be restricted to non-visible or secondary applications.","Check whether the jurisdiction is in a wildfire-prone area (WUI) requiring a Class A fire-rated roof assembly — if so, confirm the specific wood shake/shingle assembly (which typically achieves Class A only through an approved fire-retardant treatment or a listed underlayment/fire-barrier assembly, not the raw wood product alone) has a current listing for that rating.","Confirm the local jurisdiction actually permits wood shake/shingle roofing at all in the applicable wildfire or fire-zone overlay, since some high-fire-hazard jurisdictions prohibit wood roofing outright regardless of fire-rated assemblies.","Verify spacing/battens, interlayment felt, and ventilation details match the CSSB installation specification for the specific product and slope, since wood roofing performance (and often the fire-rated assembly's listing) depends on the full assembly, not the shakes alone."],"gotchas":["A Class A fire rating for wood shake/shingle roofing is almost always an assembly rating (wood product plus a specific treatment, underlayment, or fire-barrier system) — a bare or field-treated wood shake claimed as 'Class A' without the tested assembly components is not code-compliant.","Some wildfire-hazard jurisdictions prohibit wood roofing entirely rather than merely requiring Class A — check the local fire/building code overlay directly rather than assuming a Class A rated product resolves all wildfire-zone restrictions."],"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/7896d6a6-eb5b-4e36-a704-2429247b2b6c"}