June 23rd, 2015 9:51 AM by Eileen Denhard
Stone walls for raised beds should be about 12 inches high.
The setup: A stacked flagstone wall for your raised beds has an old-world look that mellows any landscape. Best of all, you don’t have to be stonemason to build one. Begin by laying out the wall with stakes and mason’s line. Tamp a level bed of sand for the first course. As you add courses, stagger joints at least 3 inches. Set each course back ¼-inch so the wall leans backward slightly. Once finished, back the wall with landscaping fabric before filling with topsoil.Specs and cost: Choose a stone of consistent thickness. Flagstone might be limestone, sandstone, shale — any rock that splits into slabs. A ton of 2-inch-thick stone is enough for a wall 10 feet long and 12 inches high.
Cost: About $300 for stones and sand.Tip: Permanent retaining walls should be backed by pea gravel for drainage. In some locations, walls taller than 3 feet high require a building permit.Tools: Stakes and mason’s line, spade, shovel, a 2-by-4 that’s 8 feet long, a 4-foot level, garden rake, tamper.Time: 1 day for a 10-foot-long wall that’s 12 inches high.