![]() ![]() Fieldstone and pre-made concrete stepping stones from the lawn and garden center are good for smaller projects such as mosaic plaques and mosaic stepping stones. Masonry can be smoother by plastering with thinset a few days (preferably 2 weeks) before the mosaic is applied. Masonry, concrete and stone are also good outdoor mosaic backers. Use 1/4″ concrete backer board, which is available at building material stores and is cut by scoring with box cutter and snapped along a straight edge. Outdoor Backersĭo not use wood as a backer for outdoor mosaics. Even then, the life expectancy of such a project will be relatively short if exposed to the elements. You should seal the mosaic with multiple applications of a tile and grout sealer a few days after the grout cures. We carry convenience sized thinset mortar here.Īll that being said, if you do want to mosaic something wooden for outdoors, such as a mosaic birdhouse, use thinset mortar to attach the tiles and make sure that every surface of the birdhouse not covered in mosaic is covered in multiple coats of exterior paint. ![]() Thinset and concrete backer board is available at building material stores. For attaching the tiles, use thinset mortar instead of adhesive. Instead of wood, use 1/4″ concrete backer board for your outdoor mosaic projects. The reason is that wood swells and contracts due to humidity changes in the air, and tiles will start to fall off eventually, and usually sooner than expected. First, wood should never be used as a backer for outdoor mosaics, even those kept relatively dry. However, outdoor mosaics and wet mosaics like pools and fountains require different backers and cements. For these indoor mosaics, wood can be used as a backer, and we recommend the “glue-then-grout” method using Weldbond glue, a water-based PVA adhesive with no fumes. Our regular mosaic instructions page is written for indoor mosaics not subject to standing water such as a shower floor. Outdoor Mosaic Patio Table with bench seats by Naomi Haas. Paint the back of your mosaic with acrylic paint.Mosaic techniques for outdoor table tops, patio floors, fountains or birdbaths.Repeat process so two coats of sealant are applied.Before the sealant dries wipe the sealant off the tiles with a towel, ensuring that you remove all sealant.Paint the sealant directly onto the piece, allowing it to soak into the grout.It will however make it easier to clean and stain proof. If you have waterproofed your work correctly than sealing the grout is not necessary.The same sealant you used to seal your base can be used to seal the grout after your mosaic has been completed.If using ply or MDF as the base you could either grout over the edges or coat them with acrylic paint.pots) but it's not suitable for surfaces that requires waterproofing (timber, ply or MDF). You could use PVA as sealant on terracotta (e.g. A common sealant is PVA glue diluted in water (1 part PVA glue to 4 parts water).Allow each coat to dry completely before applying the next coat (30 minutes to 1 hour). ![]()
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