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Gravity Wall Construction



Document imprimable.pdf
Step 1: Site Prep and Excavation
  • Remove surface vegetation and organic soils
  • Per the approved plan, excavate base trench a minimum of 24 in.(610 mm) wide and 12 in. (300 mm) deep.*
  • Remove unsuitable soils and replace with compactible materials.
  • Buried block should be a minimum of 6 in. (150 mm). Check plans to see how much buried block is required.
  • Compact and level trench.
Step 2: Install Base Material
  • Per the approved plans, place a minimum of 6 in. (150 mm) of wall rock in the base trench and rake smooth.*
  • Compact and level base material.
  • Site Soils Engineer should verify that a proper base is established.
Step 3: Install Base Course
  • Begin at the lowest wall elevation.Place AB units on base material, check and adjust for level and alignment of each unit.
  • Drain pipe is required for walls over 4 ft. (1.2 m) tall or are constructed in silty or clay soils. See approved plans for location and specifications. Refer to design details for information on an alternate drain location.
Step 4: Install Wall Rock and Backfill Materials
  • Fill the AB hollow cores and a minimum of 12 in. (300 mm) behind the wall with wall rock.
  • Use approved soils to backfill behind the wall rock and in front of the base course.
  • Use a plate compactor to consolidate the area behind the block.Compact in lifts of 8 in. (200 mm) or less.
Gravity Wall Typical Cross Section


La fondation
Step 5: Install Additional Courses
  • Remove all excess material from the top surface of AB units. This can be done when installing the next course of block, by sliding the block into place.
  • Stack the next course of blocks so that the vertical seams are offset from the blocks below by at least 3 in. (75 mm) or 1/4 the length of the block.
  • Check and adjust for level, alignment and the wall batter as the wall stacks up.
  • Fill the block cores and behind with wall rock then place approved soils as described in Step 4.
  • From course 2 and above use a plate compactor to compact directly on the blocks as well as the area behind the blocks. Compact in lifts of 8 in. (200 mm) or less.
  • Complete wall to required height. Click here for information on wall ending options.
  • Use 8 in. (200 mm) of impermeable fill on the last lift to finish off wall.


See Reinforced Wall Construction for more detailed information on these installation steps.


*For walls under 4 ft (1.2 m), an 18 in. (460 mm) wide by 10 in. (250 mm) deep trench with 4 in. (100 mm)of wall rock base materials is acceptable.

Installez la base
Installez la base, mesurez le niveau, compactez.

Contrôlez le niveau des blocs
Contrôlez le niveau des blocs et ajustez où c'est nécessaire



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