Building a Limestone Patio with Moss Joints in Shade: Base Preparation Steps

For a limestone flagstone patio in part/deep shade: level subgrade to 1 inch, compact, add 2–3 inches crushed granite, screed with a 4-ft level on an 8-ft 2×4, compact again, add 1 inch sand setting bed, screed, set stones, tap with rubber mallet. Sweep a 50/50 mix of organic soil and sand into joints, then plant Irish moss. Keep moist until established.