{"id":"det-021","license":"CC-BY-4.0","data":{"title":"Skylight swap: plastic dome vs multipane tempered glass","file":"/diagrams/det-021-skylight-plastic-vs-multipane.svg","caption":"FA Exhibit DET-021. Plastic skylight dome versus multipane tempered glass.","alt":"Two NTS curb sections compare thermoplastic dome glazing with an IBHS Plus multipane glass option having at least two tempered panes. A source-status strip distinguishes FEMA guidance, Oregon code options, and the IBHS voluntary standard.","kind":"diagram","rights":"cc-by-4.0","depicts":"FEMA routes existing plastic skylight glazing to one of its recommended glazing types; the source-grounded comparison is a plastic dome versus an explicit IBHS Plus option—multipane glass with at least two tempered panes","identifiableAddress":false,"exifGpsStripped":true,"derivation":"SOURCES · FEMA P-737 §4.5 (2025) · 2023 ORSC R327.3.6 · IBHS WFPH Plus §3.1.5 (2025) · U.S. patent geometry records.","technicalReviewer":"Grayson Graham","lastVerified":"2026-08-25T00:00:00.000Z"}}