FA Exhibit MECH-003. Water of crystallization in gypsum delays heat. Not a permit and not a sixth numbered eave item by itself. After Gypsum Association Type X description and R327 Type X exception language. Not-to-scale chemistry schematic. Illustrative — not a construction document. Verify with your building official. CC BY 4.0.
Technical review: Grayson Graham. Last verified 2026-08-23. JSON
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<img src="https://fireapproved.com/diagrams/mech-003-type-x-calcination.svg" alt="Sequence showing gypsum calcination, water of crystallization driven off as steam, and a Type X layer behind an exterior covering." />
