For a 20×15-foot Saltillo tile patio on bare dirt in frost-free Southern California, you have two installation paths. If tiles are under 1 inch thick (true tiles), pour a 4-inch concrete slab, then mortar-set and grout like interior tile. If they're pavers (over 1 inch thick), use a compacted 3-inch crushed granite base topped with 1 inch of screeded sand.
Either way, ensure the subgrade is firm, graded for drainage (¼ inch per foot away from structures), and compacted. Saltillo is porous—seal it after installation with a penetrating sealer to resist staining. In freeze-thaw climates, the concrete slab method is mandatory; in your zone, the sand-set paver method works well and allows minor movement without cracking.
Buy extra tiles for breakage and future repairs. Home Depot stock varies—verify thickness and quality before committing.
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