pack wall

pack wall

[′pak ‚wȯl]
(mining engineering)
A wall of dry stone built along the side of a roadway, or in the waste area, of a coal or metal mine to help support the roof and to retain the packing material and prevent its spreading into the roadway.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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SAVE: pounds 5.84 a pack Walls Crown Standard, Earth Balance and Originals emulsions (2.5 litres), B&Q, pounds 18.98 each or buy one, get one free.
So "rock on" and dense pack walls. The approach is practical and cost effective.