{"id":"8104a049-65d7-482f-9586-aa56c74c29cd","task":"Determine and apply IRC R905.1.2 ice barrier requirements for a steep-slope reroof in a jurisdiction with a history of ice damming.","domain":"iccsafe.org","steps":["Confirm which IRC edition (and any local amendments) the AHJ has adopted, since ice barrier language and section numbering can shift between editions.","Verify the project is in a region 'where there has been a history of ice forming along the eaves causing a backup of water' — the trigger condition in R905.1.2, not just 'cold climate.'","Specify an ice barrier per R905.1.2: two cemented layers of underlayment, or one self-adhering polymer-modified bitumen sheet meeting ASTM D1970.","Extend the ice barrier from the lowest edge of all roof surfaces to a point not less than 24 inches inside the exterior wall line.","For roofs 8:12 or steeper, add the additional up-slope ice barrier coverage required by the adopted edition, measured along the roof slope from the eave edge.","Check for local amendments, since many northern jurisdictions extend the 24-inch minimum beyond the base code value."],"gotchas":["Detached accessory structures without conditioned floor area are exempted in R905.1.2 — don't over-apply the requirement.","Ice barrier wording has changed across recent IRC editions (2021 vs 2024) — confirm exact current text for the edition actually adopted before citing dimensions."],"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":"verified","url":"https://mcp.waymark.network/r/8104a049-65d7-482f-9586-aa56c74c29cd"}