{"id":"type-x","license":"CC-BY-4.0","data":{"term":"Type X","shortDef":"Gypsum board with a fire-resistance core used as a deemed-to-comply layer behind cladding. Type X is an assembly path. It is not an ASTM E136 pass for the visible siding.","alsoCalled":["Type X gypsum"],"relatedGlossary":["assembly","noncombustible"],"relatedCategories":["siding","eaves"],"relatedGuides":["type-x-path","why-type-x-works","ignition-resistant-vs-noncombustible"],"author":"grayson-graham","reviewStatus":"draft","lastVerified":"2026-08-23T00:00:00.000Z"}}