HELP! Countertop Nailed in instead of Screws
This sounds like the older "custom countertops" made from plywood, nailed down to the base counters, and then the formica was glued onto the countertops on site. As previously posted, use pry bars, a lot of TLC and the counter top(s) should come off. You did not mention back splash, if they were added after the counter tops then they may have to come off first, as they were probably nailed on separately. IF you already know that roofing nails were used (I've never seen this one) then you must have uncovered some area of counter top already. You may gain by lifting the counter top some, cutting the nails with a Sawzall, or a mini-hacksaw to make it easier.