Block = nautical 
Block = flooring

I may be the only one who read "block" in a paving context. Used to be much more
common to make floors of blocks.......end grain up. Or maybe someone has already
confirmed the meaning of the compound word "schruffhobel"? All Google is telling
me is "dross of metals". "Hobel" of course is "slicer".

For giggles, I sent the thread to mein Vater, who while not
Galootish at all, ist ein fluent and native Deutsche spracher. Will post if he
has anything interesting to observe.