Selecting the correct tile adhesive is just as important as selecting the right tile for the project. The job of the adhesive is to bond the bottom of the tile to a surface, called the setting bed. In the last few years, there have been vast improvements in adhesives which make it easier for people to lay tile themselves, without contracting the job out to a professional. Organic mastics and thin-set mortar are most common, although latex, acrylic, and epoxy are also used. The first step in choosing a tile adhesive is to consider the kind of installation involved in the project. A tile installer should consider whether the tile will be applied inside or outside, to the wall or the floor, or in a wet or dry area, among other issues. In addition, the installer should reflect on the kind of setting bed that will be used: drywall, concrete, plywood, or backerboard. Organic mastics are among the most popular kinds of adhesives. They are commonly purchased because they do not require mixing and they help wall tiles stay in place without slipping. Those who use them must be careful of where the tiles will be set, however, because this type of adhesive shouldn’t be used in locations that are exposed to heat or for tiles applied outside of the home.