![]() ![]() For further knowledge on constructing boulder walls, click here to see the most common reasons why boulder walls fail. Using bigger boulders will lead to a much longer lasting wall. When constructing a boulder wall, remember that bigger is better for boulder size. Plant gaps between boulders to improve wall durabilityīoulder walls can be a beautiful and durable solution as a retaining wall or purely for decorative purposes.You will use more rock this way but the wall will be MUCH stronger. For example, if a boulder is shaped like a shoebox then put one of the ends of the shoebox facing outwards. Spend time piecing together wall for tightest fit.Set courses (rows) back 3 inches per foot of wall height.Don’t use fabric in clay/silty soils as fabric will plug up, bulge, and push the wall forward.Use fabric behind boulders in sandy/gravely soils Masonry chimneys and foundations shall be anchored at each floor, ceiling or roof line more than 6 feet (1829 mm) above grade with two 3 / 16 -inch by 1-inch (4.8 mm by 25 mm) straps embedded not less than 12 inches (305 mm) into the chimney.Add drainage rock behind wall in poorly draining (i.e.Bury 1/3 to 1/2 of first course (row) so bottom of wall can’t slide out.Use a 3″-6″ compacted gravel base in soft soils.Better to order a little less than you think you need as trying to return massive boulders can be a pain.Walls over 8 feet (sometimes even over 4′) need engineering (i.e.Heavier walls are more resistive to erosion, freeze/thaw cycles, etc. Boulder size should increase as wall height increases. Tips for Installing Boulder Retaining Walls It will also protect against freeze/thaw heaving. This will give the boulder wall a solid foundation to sit on. If you have silty/clay soils, the boulder wall calculator will include an estimate for drainage gravel that is recommended behind the wall.Īlso remember to add compacted gravel under the first course if you have silty/clay soils or soft soils that don’t compact well. Soil Typeįinally, choose the type of soil you have at the location you are building the wall and hit calculate. Obviously there is some wiggle room here. Now you can choose your boulder size based on the following recommended minimum boulder sizes: This is a very common combination used in boulder walls. Fieldstone is usually sold as a combination of granite, limestone, and sandstone. Next, choose the type of rock you will use. Then, add these up and divide by the total number of measurements taken. The average height can be found by first taking several measurements every few feet. How To Use This Calculator Wall Dimensionsįirst, enter the length and average height of the wall you are building. These numbers can vary significantly from supplier to supplier. *Note – The materials densities and coverages are averages derived from multiple landscape material suppliers. ![]()
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