Are the handmade tiles suitable for outside?
The tiles are not frost proof. If water gets into the glaze and freezes, it will expand and the glaze will eventually flake off, which is ok if the look you want is romantic decay. I have included a photo of some weathered tiles I saw in Mexico. Despite being in the Tropics the altitude means occasionally it freezes. You can, however, tile on an external house wall, as the heat emanating from the house would stop the tiles freezing.
