{ "dataset_name": "Residential Radon Mitigation Diagram Library", "version": "1.1", "verified_date": "2026-07-24", "records": [ { "record_id": "RMSD-001", "diagram_id": "D01", "diagram_title": "Active sub-slab depressurization — interior route", "system_family": "Active soil depressurization", "foundation_type": "Basement or slab-on-grade", "collection_interface": "Suction point or pit beneath slab", "fan_present": "Yes", "fan_location_shown": "Unconditioned attic/garage zone; exact placement governed by current standard and jurisdiction", "vent_route": "Interior vertical route to outdoor discharge", "monitoring_component": "U-tube pressure indicator plus system warning device; separate radon test device shown", "component_ids": "C01|C02|C03|C07|C08|C09|C10|C11|C12|C13|C14|C17|C18", "primary_source_org": "U.S. EPA; Iowa HHS / Iowa Administrative Rules", "primary_source_title": "Consumer’s Guide to Radon Reduction (2025); Iowa Administrative Code 641—Chapter 44", "source_publication_or_effective_date": "EPA guide 2025; Iowa rule effective 2026-07-01", "source_url": "https://www.epa.gov/sites/default/files/2016-12/documents/2016_consumers_guide_to_radon_reduction.pdf | https://rules.iowa.gov/Notice/Details/0290D", "verification_date": "2026-07-24", "verification_tier": "★", "iowa_rule_note": "Paid professional mitigation generally requires Iowa credentialing; current rule incorporates ANSI/AARST SGM-SF-2023 as amended through 2025-08-01.", "limitations": "Conceptual, not to scale. Does not specify pipe diameter, fan model, electrical design, exhaust clearances, or suction diagnostics." }, { "record_id": "RMSD-002", "diagram_id": "D02", "diagram_title": "Active sub-slab depressurization — exterior route", "system_family": "Active soil depressurization", "foundation_type": "Basement or slab-on-grade", "collection_interface": "Interior or exterior sub-slab suction point", "fan_present": "Yes", "fan_location_shown": "Exterior, with outdoor-rated installation concept only", "vent_route": "Foundation penetration to exterior riser and outdoor discharge", "monitoring_component": "Indoor-visible pressure indicator; separate radon test device", "component_ids": "C01|C02|C03|C07|C08|C09|C10|C11|C12|C13|C14|C18", "primary_source_org": "U.S. EPA; Iowa HHS / Iowa Administrative Rules", "primary_source_title": "Consumer’s Guide to Radon Reduction (2025); Iowa Administrative Code 641—Chapter 44", "source_publication_or_effective_date": "EPA guide 2025; Iowa rule effective 2026-07-01", "source_url": "https://www.epa.gov/sites/default/files/2016-12/documents/2016_consumers_guide_to_radon_reduction.pdf | https://rules.iowa.gov/Notice/Details/0290D", "verification_date": "2026-07-24", "verification_tier": "★", "iowa_rule_note": "Use the Iowa legal overlay only for Iowa installations; national figure remains schematic.", "limitations": "No universal cold-weather insulation, slope, diameter, sound, or clearance specifications are asserted." }, { "record_id": "RMSD-003", "diagram_id": "D03", "diagram_title": "Drain-tile suction system", "system_family": "Active soil depressurization using drain tile", "foundation_type": "Basement or slab with perimeter drainage path", "collection_interface": "Existing drain tile or perforated collection loop", "fan_present": "Yes", "fan_location_shown": "Generic unconditioned/exterior zone", "vent_route": "Drain-tile connection to vent riser and discharge", "monitoring_component": "Pressure indicator and separate radon test device", "component_ids": "C01|C04|C05|C07|C08|C09|C10|C11|C13|C14|C18", "primary_source_org": "U.S. EPA", "primary_source_title": "Consumer’s Guide to Radon Reduction (2025)", "source_publication_or_effective_date": "2025", "source_url": "https://www.epa.gov/sites/default/files/2016-12/documents/2016_consumers_guide_to_radon_reduction.pdf", "verification_date": "2026-07-24", "verification_tier": "★", "iowa_rule_note": "Iowa credentialing and SGM-SF overlay applies to compensated existing-home work.", "limitations": "A drain-tile path is shown conceptually; the figure cannot establish whether a real drainage network communicates adequately." }, { "record_id": "RMSD-004", "diagram_id": "D04", "diagram_title": "Sump-hole suction system", "system_family": "Active soil depressurization using sump opening", "foundation_type": "Basement or slab with sump", "collection_interface": "Sealed, serviceable sump opening connected to sub-slab zone", "fan_present": "Yes", "fan_location_shown": "Generic unconditioned/exterior zone", "vent_route": "Sump connection to vent riser and discharge", "monitoring_component": "Pressure indicator and separate radon test device", "component_ids": "C01|C02|C05|C07|C08|C09|C10|C11|C13|C14|C18", "primary_source_org": "U.S. EPA", "primary_source_title": "Consumer’s Guide to Radon Reduction (2025)", "source_publication_or_effective_date": "2025", "source_url": "https://www.epa.gov/sites/default/files/2016-12/documents/2016_consumers_guide_to_radon_reduction.pdf", "verification_date": "2026-07-24", "verification_tier": "★", "iowa_rule_note": "The schematic does not replace Iowa-required diagnostic design or post-mitigation testing.", "limitations": "Does not prescribe a cover product, drainage connection, pump service access, or flood-control design." }, { "record_id": "RMSD-005", "diagram_id": "D05", "diagram_title": "Crawlspace submembrane depressurization", "system_family": "Active submembrane soil depressurization", "foundation_type": "Crawlspace", "collection_interface": "Suction beneath sealed soil-gas-retarder membrane", "fan_present": "Yes", "fan_location_shown": "Generic unconditioned/exterior zone", "vent_route": "Submembrane connection to vent riser and discharge", "monitoring_component": "Pressure/system indicator and separate radon test device in occupied area", "component_ids": "C01|C06|C07|C08|C09|C10|C11|C13|C14|C18", "primary_source_org": "U.S. EPA", "primary_source_title": "Consumer’s Guide to Radon Reduction (2025)", "source_publication_or_effective_date": "2025", "source_url": "https://www.epa.gov/sites/default/files/2016-12/documents/2016_consumers_guide_to_radon_reduction.pdf", "verification_date": "2026-07-24", "verification_tier": "★", "iowa_rule_note": "Current standard and jurisdiction govern membrane, seams, service openings, fan, and discharge details.", "limitations": "No membrane thickness, seam method, anchorage, drainage, or structural requirements are asserted." }, { "record_id": "RMSD-006", "diagram_id": "D06", "diagram_title": "Block-wall suction combined with sub-slab suction", "system_family": "Combined active soil and hollow-wall depressurization", "foundation_type": "Basement with hollow block foundation wall", "collection_interface": "Hollow block-wall path plus sub-slab suction zone", "fan_present": "Yes", "fan_location_shown": "Generic unconditioned/exterior zone", "vent_route": "Joined collection branches to riser and discharge", "monitoring_component": "Pressure indicator and separate radon test device", "component_ids": "C01|C02|C03|C07|C08|C09|C10|C11|C13|C14|C16|C18", "primary_source_org": "U.S. EPA", "primary_source_title": "Consumer’s Guide to Radon Reduction (2025)", "source_publication_or_effective_date": "2025", "source_url": "https://www.epa.gov/sites/default/files/2016-12/documents/2016_consumers_guide_to_radon_reduction.pdf", "verification_date": "2026-07-24", "verification_tier": "★", "iowa_rule_note": "The combination is an illustrated system family, not a recommendation for every block-wall home.", "limitations": "Does not show site-specific block-wall openings, firestopping, structural work, or pressure-field diagnostics." }, { "record_id": "RMSD-007", "diagram_id": "D07", "diagram_title": "Mixed-foundation and multiple-zone system", "system_family": "Combined active soil depressurization", "foundation_type": "Basement plus slab-on-grade and/or crawlspace", "collection_interface": "Two or more independently identified foundation zones", "fan_present": "Yes, shown as one conceptual interconnected system; actual design may differ", "fan_location_shown": "Generic unconditioned/exterior zone", "vent_route": "Multiple collection branches to one conceptual riser/discharge", "monitoring_component": "System indicators plus separate radon testing", "component_ids": "C01|C02|C03|C06|C07|C08|C09|C10|C11|C13|C14|C15|C18", "primary_source_org": "U.S. EPA; Iowa HHS / Iowa Administrative Rules", "primary_source_title": "Consumer’s Guide to Radon Reduction (2025); Iowa Administrative Code 641—Chapter 44", "source_publication_or_effective_date": "EPA guide 2025; Iowa rule effective 2026-07-01", "source_url": "https://www.epa.gov/sites/default/files/2016-12/documents/2016_consumers_guide_to_radon_reduction.pdf | https://rules.iowa.gov/Notice/Details/0290D", "verification_date": "2026-07-24", "verification_tier": "★", "iowa_rule_note": "Iowa’s fee rule recognizes interconnected systems may contain one or more fans, suction points, and exhausts; this drawing does not determine fee treatment.", "limitations": "The number of suction points, fans, branches, and zones must be determined for the building; one fan or one riser is not claimed sufficient." }, { "record_id": "RMSD-008", "diagram_id": "D08", "diagram_title": "Passive radon system in new construction", "system_family": "Passive sub-slab system / radon-resistant new construction", "foundation_type": "New one- or two-family dwelling", "collection_interface": "Prepared sub-slab collection layer or suction point", "fan_present": "No", "fan_location_shown": "Fan-ready location may be identified but no fan is active", "vent_route": "Vertical route through conditioned space to roof discharge; Iowa rule definition specifies 12 inches above roof", "monitoring_component": "No active-system fan monitor shown; radon testing remains separate", "component_ids": "C01|C02|C03|C07|C08|C10|C14|C17|C18", "primary_source_org": "Iowa General Assembly; Iowa HHS; ANSI/AARST", "primary_source_title": "Iowa Acts Ch. 1124 (HF 2297); Iowa Administrative Code 641—Chapter 44; CCAH-2020-0523 listing", "source_publication_or_effective_date": "Act approved 2026-05-19; Iowa code edition checked 2026-07-08; CCAH rev. 2023", "source_url": "https://www.legis.iowa.gov/docs/publications/iactc/91.2/CH1124.pdf | https://www.legis.iowa.gov/docs/iac/chapter/07-08-2026.481.301.pdf | https://standards.aarst.org/", "verification_date": "2026-07-24", "verification_tier": "★", "iowa_rule_note": "Iowa Acts Ch. 1124 directs adoption of a 2021 IRC Appendix AF passive method for construction commenced after adoption. The published 2026-07-08 Chapter 301 still deletes appendices AA–CH; confirm the current code for project-specific status.", "limitations": "National plate must not present Iowa’s 12-inch definition or the statutory adoption direction as a universal or project-specific code conclusion." }, { "record_id": "RMSD-009", "diagram_id": "D09", "diagram_title": "Passive-to-active conversion", "system_family": "Activation of passive system", "foundation_type": "Existing fan-ready passive system", "collection_interface": "Existing passive collection layer and vent route", "fan_present": "Yes after conversion", "fan_location_shown": "Conceptual code-compliant unconditioned/exterior location", "vent_route": "Existing passive riser activated by added in-line fan", "monitoring_component": "Active-system pressure/warning indication plus separate radon test", "component_ids": "C01|C02|C03|C07|C08|C09|C10|C11|C12|C13|C14|C17|C18", "primary_source_org": "Iowa HHS / Iowa Administrative Rules; ANSI/AARST", "primary_source_title": "Iowa Administrative Code 641—Chapter 44; CCAH-2020-0523 listing", "source_publication_or_effective_date": "Iowa rule effective 2026-07-01; CCAH rev. 2023", "source_url": "https://rules.iowa.gov/Notice/Details/0290D | https://standards.aarst.org/", "verification_date": "2026-07-24", "verification_tier": "★", "iowa_rule_note": "In Iowa, conversion of a passive system to an active system must be performed by a person credentialed under Chapter 44.", "limitations": "The plate does not assert that every passive pipe is suitable for activation without evaluation." }, { "record_id": "RMSD-010", "diagram_id": "D10", "diagram_title": "Manometer versus radon test — what each device shows", "system_family": "Monitoring and verification detail", "foundation_type": "Any active system; passive comparison included", "collection_interface": "Not applicable", "fan_present": "Active-system example: yes; passive-system example: no", "fan_location_shown": "Not the focus", "vent_route": "Small pipe segment detail only", "monitoring_component": "U-tube manometer indicates pressure/flow condition; radon test measures radon concentration", "component_ids": "C08|C09|C11|C13|C18", "primary_source_org": "Michigan EGLE; U.S. EPA", "primary_source_title": "Even homes with radon mitigation systems should test every two years (2025); Consumer’s Guide to Radon Reduction (2025)", "source_publication_or_effective_date": "2025-01-29; EPA guide 2025", "source_url": "https://www.michigan.gov/egle/newsroom/mi-environment/2025/01/29/test-for-radon | https://www.epa.gov/sites/default/files/2016-12/documents/2016_consumers_guide_to_radon_reduction.pdf", "verification_date": "2026-07-24", "verification_tier": "★", "iowa_rule_note": "Iowa post-mitigation testing requirements are separate from system pressure indication.", "limitations": "No universal “correct” manometer number is published; the normal baseline is system-specific." } ] }