053-3 Wyo. Code R. § 57.22221 - Overcast and undercast construction (I-A, II-A, III, and V-A mines)

Overcasts and undercasts shall be-

(a) Of substantial construction;

(b)

(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;

(c) Kept clear of obstructions.

Notes

053-3 Wyo. Code R. § 57.22221