I think he is internally justifying it like it's not hurting anyone and no doubt there will be skips/etc., during our build so his rubbish will just 'disappear'...
Oh that’s crappy... really not fair to you!
True... I spoke to him about it but it was hard to get him to own the problem since he's being cheap and procrastinating, etc... Anyway in the whole scheme of things it's not worth alienating a neighbour over. I left it as diplomatically as I could, reasoning that "if there is a dump pile, passers-by will opportunistically dump more, on *both* our blocks..." and it might sink in!