NM CID GS-30 Practice Questions - New Mexico CID GS-30 Plastering, Stucco And Lathing Examination Exam

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Why must portland cement plaster and gypsum plaster not be mixed together or applied as succeeding coats on each other unless a standard specifically allows the combination?

The two binders are chemically incompatible; gypsum can cause deterioration of portland cement paste, and the coats do not form a reliable bond Gypsum makes portland cement plaster too dark The combination is stronger than either material alone, so codes forbid it as overkill They set at exactly the same time and cannot be troweled

Correct Answer:

The two binders are chemically incompatible; gypsum can cause deterioration of portland cement paste, and the coats do not form a reliable bond

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