Technical Resource Guide_WEB_BEL25-D-516650 - Page 38 of 84

38 | belgard ® product installation guide | belgard.com | 877-235-4273 Outside Curves CALCULATE THE RADIUS When building an outside curve, begin by determining the desired radius of the top course. This will be the smallest radius in the wall and must not be less than the minimum radius for the wall system used. To determine the approximate base course radius: 1) Add ¼-inch to the setback of the block used. Multiply that by the number of courses in the finished wall. 2) Add desired radius length of the top course to the result of step 1. This number equals the approximate radius length of the base course. 3) To determine the radius for the front edge of the trench, add 6 inches to the approximate radius length of the base course. Example: Setback of the Highland Stone ® product is 11/8-inch. The wall is 8 courses high. The desired radius of the wall measured to the front of the block on the top course is 6 feet. 1) Setback multiplied by number of courses 11/8" + 1/4" = 13/8" x 8 courses = 11" 2) Desired radius plus setback 6' + 11" = 6'11" 3) Front of trench 6'11" + 6" = 7'5" LAY OUT THE TRENCH Drive a stake into the ground at the desired radius point of the curve. Attach a string and rotate it in an arc at the desired length to mark the curve in the soil. Dig the trench. BASE COURSE Using the existing radius point stake and string, mark the base course curve on the leveling pad. Align the front of the block with the marked curve and ensure level placement from side to side and front to back. ADDITIONAL COURSES On each course, some of the rear lip of each block must be in contact with the back of the units below to ensure structural stability. The setback of the block will cause the radius of each course to gradually decrease and eventually affect the running bond of the wall. To maintain proper running bond, use partial units as needed. Once a split or cut unit is cut to size, glue in place with a concrete adhesive. Additional Courses String Stake Mark Base Course Curve Front of Trench 6" Wider for Base Pro Tip Subtract the depth of the block if you prefer to mark the curve from the back of the block.