A couple of days ago a humidity barrier was painted onto the older concrete slab prior to screeding (the bit of the underfloor that is actually smooth and level). “Humidity barrier” is a euphemism for “disgusting, sticky black goo that looks like liquid tar”. A couple of rooms' worth of spreading the thing around, and the man had to leave the gloves on the broomstick. They went, broom and all, in the skip the next day.