{"id":"det-003","license":"CC-BY-4.0","data":{"title":"The Type X exception: wood siding over 5/8\" exterior gypsum","file":"/diagrams/det-003-type-x-exterior-wall-exception.svg","caption":"FA Exhibit DET-003. The Type X exterior-wall exception.","alt":"An exterior wall section shows framing, one layer of five-eighths-inch Type X exterior gypsum sheathing, and exterior covering or cladding in that order. A bracket marks the covering extent from the top of the foundation to the roof, with termination at two-inch nominal blocking or the underside of an enclosed soffit.","kind":"diagram","rights":"cc-by-4.0","depicts":"ORSC R327.3.3 exception 1 deems an exterior wall to meet the section's assembly performance criteria when one layer of 5/8-inch (15.9 mm) Type X exterior gypsum sheathing is applied behind the exterior wall covering or cladding, on the exterior side of the framing","identifiableAddress":false,"exifGpsStripped":true,"derivation":"AFTER ORSC R327.3.3 EXCEPTION 1 & R327.3.3.1 · FEMA P-737 §4.3 CONTEXT · PARENT: WAL-100.","technicalReviewer":"Grayson Graham","lastVerified":"2026-08-25T00:00:00.000Z"}}