['Specialized Industries']

['Mining']

07/19/2025

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§57.22221 Overcast and undercast construction (I-A, II-A, III, and V-A mines).

...

§57.22221 Overcast and undercast construction (I-A, II-A, III, and V-A mines).

RegSense CFR Regulations Mining Specialized Industries CFR Section English Focus Area USA

Overcasts and undercasts shall be—

(a) Of substantial construction;

(1) Constructed of noncombustible materials; or

(2) Where constructed of combustible materials, the outside surfaces shall be coated with at least one inch of construction plaster containing perlite and gypsum; at least one inch of expanded vermiculite, Portland cement and limestone; or other coatings with equivalent fire resistance;

['Specialized Industries']

['Mining']

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