Tiling over an uneven surface will give you less than stellar results so level out any globs of dried grout with a sander and secure loose tiles with fresh.
Tiling outside of cooler walls.
Repair any loose or cracked tiles.
3 apply a waterproofing membrane.
Generally ceramic porcelain or stone tile can be installed in exterior locations over suitable substrates such as masonry concrete mortar beds and in some cases certain types of backer board units.
Installation can be made on a damp surface but new concrete must cure for at least 28 days before adhering tile.
9 clean up after grouting.
2 prepare the exterior substrate to receive tile.
Basic temperatures most thin set grout and mastic manufacturers ask that you maintain between 50 and 100 degrees fahrenheit with a minimum time of 72 hours allowed for drying.
A mortar like custom s prolite rapid setting tile.
Warmer temperatures speed up curing time.
Remove the tile and prepare the wall according to the corresponding instructions above or tile over the existing tile.
Wash the wall with tsp tri sodium phosphate or an ammonia based cleaner to remove any grease or oil.
Additionally epoxy mortar sets quickly.
In warm climates the barrier should point to the outside of the house blocking the vapor from the humid outside air that may seep into the walls or ceilings.
Prepare the surface for installation.
In cold climates the opposite is true.
The air is usually warmer inside the house so condensation can build up from air entering the wall from the inside.
On the downside epoxy mortar is more expensive than thinset and has a strong smell while it cures.
Keep in mind that the surface receiving the tile may be colder than the air temperature above it.
Nearly any type of tile can be used on an exterior wall including ceramic stone or glass as long as it.
10 complete the installation and maintain as needed.
To do so make sure all of the tiles are intact and secure.
6 set the tile.
If you must install tile in an environment near the recommended 50ยบ f minimum the installation may benefit from an accelerated or rapid curing mortar.
7 prepare the installation for grouting.
1 inspect the exterior substrate.
8 mix and apply grout.
Unlike the tiles used for indoor walls and floors outdoor tiles need to be particularly strong and able to withstand a wide range of temperatures and weather conditions.
And just how strong they need to be is dependent on the level of use you anticipate.
If existing tiles are beyond repair remove the tile and install a piece of wallboard in its place.
Cooler temperatures slow it down.
These substrates must be structurally sound meet deflection requirements and meet on plane requirements.