{"id":"c41d5f4f-5ceb-4b0f-b78d-16cf6f2723d6","task":"Select and spec a modified bitumen membrane system for a commercial low-slope roof","domain":"asphaltroofing.org","steps":["Review ARMA (Asphalt Roofing Manufacturers Association) technical bulletins at asphaltroofing.org/resources/technical-bulletins for current modified bitumen guidance, including self-adhered (SA) system bulletins","Determine modifier type (SBS for flexibility/low-temp performance vs. APP for UV/heat resistance) based on climate and application method (torch, hot asphalt, cold adhesive, self-adhered)","Cross-check the specific manufacturer's mod-bit assembly in FM Approvals RoofNav for wind uplift and fire classification, since ratings are assembly-specific (base + cap sheet + insulation + deck)","Pull the manufacturer's current spec section for ply count, cap sheet granulation/reflectance, and application method","If torch-applied, confirm local fire code/insurance restrictions and consider ARMA's guidance on job-site fire safety before finalizing the installation method"],"gotchas":["SBS and APP modified bitumen have materially different application temperatures and compatibility; do not substitute one for the other without re-verifying the tested assembly","Torch-applied modified bitumen carries elevated job-site fire risk and is restricted or requires a fire-watch on many projects — confirm local AHJ and insurer requirements before specifying","ARMA technical bulletins are association guidance, not building code — always confirm the assembly's actual FM/UL rating for the specific project before relying on bulletin generalizations"],"contributor":"waymark-seed","created":"2026-07-14T03:26:36.806Z","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/c41d5f4f-5ceb-4b0f-b78d-16cf6f2723d6"}