How to Prepare for a Retaining Wall - Site Excavation

Prepare the Allan Block retaining wall jobsite. Allan Block is a mortarless system that requires no concrete, grout, or pins to hold it together. This video discusses topics for laying out and excavating the jobsite. It also includes digging the base trench and placing the drain pipe, as well as building and compacting a gravel base. . You can find many more videos, photos, literature, estimating tools and more regarding retaining walls, AB Courtyard Collection seating walls and the AB Fence product at www.allanblock.com.

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Commercial Retaining Wall Construction

An informative video of an actual Allan Block retaining wall under construction. This Commercial application show all the steps involved in building an AB retraining wall. For more information or to watch other instructional videos, visit our website at www.allanblock.com.

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How to Build a Geogrid Reinforced Retaining Wall

Geogrid is a polyester woven fabric used to reinforce the soil behind a retaining wall. This video shows how to build a reinforced Allan Block retaining wall. Allan Block is a mortarless system that requires no concrete, grout, or pins to hold it together. There are two basic types of grid: Uniaxial and Biaxial. With uniaxial grid you must roll out the grid perpendicular to the wall, cut the grid to the designed length, and repeat as you move along the wall. With a biaxial grid, such as AB Reinforcement Grid, you can simply select a roll width that matches the design length and roll the geogrid along the retaining wall. You can find many more videos, photos, literature, estimating tools and more regarding retaining walls, AB Courtyard Collection seating walls and the AB Fence product at www.allanblock.com



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Basic Steps To A Retaining Wall Installation

The first step is to determine the size or area of the retaining wall by linear foot. This will figure into the estimate of materials needed later. Mark off the area with a string line and allow for extra room on the sides of the retaining wall blocks for a good gravel base.

Estimate the materials needed, chose desired retaining wall blocks, the size you choose will determine the amount needed, for example: if 12 inch blocks are used the number times the linear foot needed is obvious. If 8 or 16 inch blocks are used, convert total linear distance needed to inches and divide by 8 for an eight inch block. Estimate base material -gravel(3/4 " quarry process) for under retaining wall, use 4-6 inch gravel base, more if retaining wall is higher in size.

Preparing for a good retaining wall base is important and will be the most time consuming process. Excavate by shovel or loader if available, use local digging laws to make sure to avoid any buried cable. If possible use a landscape fabric under gravel for better support and protect base from soil. Some areas may require a deeper base (6 or more inches) due to poor soil or recent disturbed soil from new house construction. Next - get the gravel base in by wheelbarrow, shovel, loader, and rake it out to approximate level.

Grade the retaining wall base with a rake and 2X4 to get an even base where the wall will be placed. The string line should be in place with a proper level set and the direction of the wall. So when the base is ready and compacted to the correct string level, all you need to do is line the rear flat side of the retaining wall blocks with the string and keep on placing blocks. When installing string line, keep in mind that the first coarse of blocks should be 3/4 buried for good support of the entire wall.

Use a plate compactor or like compaction device to get a good solid base for the wall. If the gravel is too dry, wet it down some with a garden hose to make it pack better. Grade additional times after each compaction until complete.

Lay the retaining wall blocks along the string line until the first layer is complete, remember to have this first coarse secured well, some bury the first layer almost completely or 3/4 buried so the base is strong. When layer 1 is done, the next coarse is easier, up to the height you want to make it. Use a landscape block adhesive between each coarse for extra strength.
Some retaining wall blocks may need to be cut to finish or match nicely to a foundation or other structure. Use a diamond blade chop saw to get a nice cut. measure block in place and cut on your marked line. Retaining wall caps are a good option to use, they add a better appearance and will not allow weeds to grow between the joints on top of a wall. (depends on type of block used) secure with a landscape block adhesive for added strength.

Finish the retaining wall by adding or back fill any more base material or black dirt in front or behind the wall, seed grass if needed. If retaining wall is located in an area that water drainage is a concern, use a drain tile pipe along the back base of the wall and use rock or water friendly material for drainage purposes. Use this on the back of the retaining wall before black dirt or other soil is added.

Tip: Use Landscape Block Adhesive between each coarse of blocks, run a bead of caulk across the blocks, this will make the wall stronger and moisture will not leak through the blocks, they will be sealed.

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