What is the purpose of verification of revised thickness or product after a change order?

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After a change order, you need to verify revised thickness or product to ensure the fireproofing system still meets the required fire resistance rating and remains compliant with the design and listings. When thickness or material type is altered, the protective performance can change, so this verification checks that the applied thickness matches what was designed, that the material is the approved product or substitute, and that installation parameters (coverage, adhesion, cure, etc.) align with tested and listed specifications. This keeps the structure's fire protection intact and ensures safety and code compliance. While color matching, cost considerations, or faster installation might be factors in a change, they do not guarantee the necessary fire resistance, which is why the verification focused on thickness and product is essential.