Before we launch into the tips, it’s helpful for you to have a general idea of the installation process. Almost all stone veneer installations start with a layer or two of building paper, covered by properly installed dimpled and galvanized wire lath. The next step is to cover the lath with a 1/2-in. layer of Type S mortar, which is “scratched” while it’s still wet to allow the stone to cling better. After this “scratch coat” dries overnight, the stone is applied with the same type of mortar. If you’re using stone intended to look like it’s dry-stacked—that is, no mortar between the stones—you’re done. Otherwise you’ll finish the job by grouting the joints between the stones with mortar.