Vertical masonry consists of retaining walls and veneer as well as fireplaces pizza ovens fence columns and outdoor kitchens. If outdoors, his should always be a structural integrity application rather than a facade. Retaining walls may be dry-stacked or mortared whereas veneer is solely mortared. Veneer may hide the mortar joints to give the dry stacked appearance and should be laid in a mortar bed, not ever to be laid like brick with the air pocket and toothed corners. When done right, proper masonry should outlast all of us. Masonry done wrong can and will need repairs in as little as a few years. Protect your investment and do it once the right way.