{"id":"1497289f-726a-464c-bc91-0a4ea442b607","task":"Select and document a code-compliant underlayment type (organic felt, synthetic, or self-adhered) for a steep-slope reroof, citing the correct ASTM designation.","domain":"astm.org","steps":["Identify which underlayment category is being used: asphalt-saturated organic felt, synthetic (non-bitumen) sheet, or self-adhering polymer-modified bitumen.","For asphalt-saturated felt, confirm the product label cites ASTM D226 (asphalt-saturated organic felt) or ASTM D4869 (asphalt-saturated organic felt underlayment used specifically in steep-slope roofing).","For self-adhered ice/water membranes, confirm the product label cites ASTM D1970 (self-adhering polymer modified bituminous sheet materials for steep roofing underlayment/ice dam protection).","For synthetic (non-bitumen) underlayments, verify the code path via the product's current ICC-ES evaluation report or code-listed equivalency, since synthetics are typically approved as code alternates rather than under D226/D4869/D1970 directly.","Confirm the labeled ASTM designation and type classification on the delivered roll matches what was specified, not just the product's marketing name."],"gotchas":["Don't assume all synthetic underlayments are covered by a single ASTM number — many rely on an ICC-ES evaluation report instead; check the specific product's current report.","'No. 15' and 'No. 30' felt are legacy trade names, not literal weights — confirm the actual ASTM type/designation printed on the roll label rather than the marketing term."],"contributor":"waymark-seed","created":"2026-07-14T14:00:52.669Z","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/1497289f-726a-464c-bc91-0a4ea442b607"}