Retaining walls are built to prevent soil erosion or to prevent the fall of landslides. Moreover, they provide points of level for planting flowers or plants in an area which otherwise might be too steep for cultivation. According to some experts a high wall 4 meters in length to 15 can hold up to 20 tons of saturated soil . For this reason, you should only consider the creation of small walls of support in the vicinity of his home. If you want to build a wall higher than 4 meters high, it is necessary to request the assistance of a team of experts. Here’s how to proceed.

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Lay a garden hose on the ground to mark where you want to place the front of the retaining wall . Sprinkle flour the tube so to mark the exact position of the earth wall. Digging a trench to the width and the depth of the blocks in use. Trying to do the walls of the trench vertically as possible and then add at least two inches of gravel on the bottom of the trench. Use a compacting machine for compacting the gravel and add more, if necessary, to level the bottom of the ditch.

Place the first block in the trenches. If you’re building the wall against a solid structure, place this block against that structure. Mark the beginning and the end of the wall with two poles and attach a string between the two ends. Adjust the string so that it rests on top of the block level. This string represents the real guide for the rest of the blocks in the first row. Place the blocks so that their tops sit under the string and add or remove the gravel from the trench to level the blocks. Add the first row of overlapping stones without aligning the joints. Most of the blocks have a lip on the back, which creates an angle between them, this helps to support the weight of the soil behind the wall.

Continue adding rows of blocks until the retaining wall reaches the desired height. Install a perforated drainage pipe behind the wall, with the holes facing down and cover it with a layer of gravel. Add a couple of inches of stones and gravel at the base of the wall and Finally, add several inches of soil behind the top.