Allan Block Muros de Contención
Allan Block USA
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AB Blocks are easily modified to build inside corners. To construct an inside corner, you will remove part of the raised lip on one block on each course.
Use a saw with a diamond blade or a chisel to remove half of the raised front lip. This allows the next course to be installed on a level surface (Step 1).
Lay the modified block perpendicular to another AB unit. This creates the corner (Step 1).
On the next course, remove the opposite half of the lip of an AB unit and position it over the right angle corner (Step 2).
On each successive course, simply reverse the position of the modified block to obtain an interlocked corner.
AB Corner Blocks are used to build outside 90° corners. To construct an outside corner, you will use an AB Corner Blocks on every course, alternating a right and left hand corner for each course.
Start construction of all walls at the corner. This will keep the block alignment within the 3 in. (76 mm overlap required).
Place an AB Corner Block at the corner. Place regular AB units on the base course working out from the corner in both directions (Step 1). Level, backfill and compact.
On the 2nd course place an alternating corner block. Again work out from the corner in both directions. Level, backfill and compact (Step 2).
Repeat this procedure, alternating every other course with AB Corner Blocks. Leveling, backfilling and compacting as the wall grows (Step 3).
Altering Corner Blocks for Different Setbacks
AB Corner Blocks are manufactured with a 12° setback. With some minor adjustments, the blocks can be modified to work with any setback. To modify the block for a 6° setback, cut a notch on the short side of the block 0.75 in. (19 mm) deep.
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