MSHA - Code of Federal Regulations - 30 CFR 75.205
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MSHA - Title 30 CFR
30 CFR § 75.205
Installation of roof support using mining machines with integral roof bolters.


When roof bolts are installed by a continuous mining machine with intregal roof bolting equipment:

(a) The distance between roof bolts shall not exceed 10 feet crosswise.

(b) Roof bolts to be installed 9 feet or more apart shall be installed with a wooden crossbar at least 3 inches thick and 8 inches wide, or material which provides equivalent support.

(c) Roof bolts to be installed more than 8 feet but less than 9 feet apart shall be installed with a wooden plank at least 2 inches thick and 8 inches wide, or material which provides equivalent support.