One small joint which deteriorates can quickly lead to failures behind and throughout the wall. When moisture enters masonry or joints it can freeze and cause rapid failure in a wall. When reviewing a masonry wall check that mortar is not crumbling, broken free, missing or cracked, that weep holes are cleared of debris to provide drainage, and that masonry materials are structurally performing as required. Verify that masonry material is properly weathersealed with paint or clear silicone sealer. Many are available, and include porcelai, quarry, or natural stone tiles.
Ceramic tile performs poorly outside.
It is fairly easy to apply, after proper surface preparation. Color choices are many and bases are formulated for many different, even difficult applications where surface protection is required. If there is one drawback to paint it is longevity. Proper application can greatly increase the life expectancy, however. Comsult with local suppliers forliterature on surface preparation and use their expertise to help you with selection and preparation of these materials.