Choosing a base for an outdoor mosaic

Always keep in mind where you are planning on putting your mosaic once you have completed.

If you are putting it in the garden you need to use a sealant on the base, tiles and grout in order to waterproof the mosaic.

Outside mosaics need exterior based plywood (marine ply). Ceramic mosaics need a thick heavy base, hence terracotta and garden planters are an excellent medium.

Always consider that most surfaces, whether intended for either inside or outside use, need to be strong, dry and able to take the weight of the mosaic.