CornerStone 100 Stairs

Proper installation of stairs in a wall project requires the same care and thoroughness as the creation of the wall itself. CornerStone’s design features including the hollow core, and SecureLug simplify the process and provide installers with a range of options to create stairs that are striking and unique. This section provides illustrated step-by-step instructions for using CornerStone® 100 to construct stair details.

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Step 1: Base Levelling Pad

  • When building steps, exercise the same care used in typical retaining wall construction
  • Prepare the sub-base and base leveling pad by following Gravity retaining wall CornerStone® Installation Steps 1 to 9
  • Build each step in sequence with each course of the regular retaining wall units for best results of wall to step interlock

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Step 2: Lay First Course

  • CornerStone® first base units will have the SecureLugs removed before placing on the leveling pad
  • The first course of step units will be completely buried
  • Backfill behind the first course units with gravel, then compact and level flush to the top of the first course
  • Do not fill the step units’ hollow cores with gravel if you plan to use concrete

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Step 3: Lay Second Course

  • Place the second course of units on top of the base units
  • Place a second row of units back to back behind the second course of units on
    half bond
  • Backfill behind the second course of units with gravel, then compact and level flush to
    the top of the second course
  • Do not fill the step units’ hollow cores with gravel if you plan to use concrete

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Step 4: Lay Third Course

  • Place the third course of units on the lower backward facing units with the SecureLugs placed into the 2 hollow cores of the lower units on half bond
  • Pull the units forward to lock the SecureLugs into the lower backward units
  • The third course units will be in a forward batter approximately 1.5 inch leaving 10.5 inches exposed on the front first step
  • Place a second row of units back to back behind the third course of units on half bond

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Step 5: Continue Installation

  • Continue to install each course of step units following the same steps as above
  • The top and final step does not need backward units

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Step 6: Concrete Core Steps

  • Concrete filling the cores of all the step units will provide for greater stair stability
  • Concrete core fill flush to the top of the units
  • Use a steel bar to hand vibrate the cores to insure proper filling
  • Option: Unit cores can be filled with gravel but must be well compacted

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Step 7: Stair Threads

  • CornerStone® 12 inch deep cap units can be used as a stair tread
  • Option: Pavers, Patio Slabs or Natural Stone can also be used as a stair tread

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Step 8: 8″ Riser Cross Section

  • The 12 inch cap will overhang the step units by approximately 1.5 inch on each step
  • The riser will be a full 8 inches using the above installation
  • Properly secure the cap units using a
    concrete adhesive
  • Make sure all units are free of dirt and stones before installing
  • Place a bead of adhesive between each joint of the caps

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Step 9: Lower Step Risers

  • Lower risers can be made such as 6″ or 7″ by lowering the buried units 1 to 2 inches below the top of the backward buried unit
  • Larger treads can be created by moving the buried units back off the forward step course 3 to 4 inches to create a 15 to 16 inch tread
  • A variety of riser heights and tread lengths can be created to suit your project

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By | 2017-04-08T01:06:17+00:00 January 7th, 2016|CornerStone 100, How To, Installation, Stairs|