NM CID GS-16 Practice Questions - New Mexico CID GS-16 Masonry Examination Exam

Why is abrasive sandblasting generally unacceptable for cleaning historic or new face-brick masonry?

It is too slow to remove mortar smears It erodes the fired face (fire skin) and the mortar, leaving a porous surface that weathers and stains faster OSHA 1926.706 expressly requires sandblasting of all new masonry It increases mortar compressive strength above Type M

Correct Answer:

It erodes the fired face (fire skin) and the mortar, leaving a porous surface that weathers and stains faster

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