 You want to just make sure that you're not altering the height. But there's a type of paver called a Milano paver. It's made by the Pave Stone Company, and it's a thinner paver. So it's probably less than an inch thick, and you can glue these on. Because the problem is this. With all that old glue on there, you're going to have a heck of a time getting anything else to stick.