Right you are, Rob. The fibreboard strips provided grip for personnel attending to aerial matters on top of the wireless box.
Typically the fibreboard is manufactured with a smooth, glossy finish on one side and a rough, checkerboard pattern pressed into the backside. In this particular application as grip strips on the roof, it is important to mount the strips rough side up, otherwise it completely defeats the purpose of safe footing. Over the years I have seen a number of these boxes where the strips were replaced with plywood ones and according to a former signals vetern I talked to once, the plywood idea proved just as dangerous when wet, or with mud on your boots, as the plain aluminum roof would have been.
David
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