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Stairway Construction Continued

 Printable Document(.pdf)
Install the Base Course
  • Place the blocks with the raised front lip facing up and near the front of the trench.
  • Check each block for level from side-to-side and front-to-back. Verify the proper position of the base course by examining a string line across the back of the blocks. Make adjustments as necessary.
  • Fill in the area in front of the blocks with on-site soils. This will keep the base course blocks from shifting while filling and compacting.
  • Fill the hollow cores and at least 12 in. (300 mm) behind the blocks or more to accommodate the next stair riser with wall rock.
         Base course for steps 		Align first stair riser
Backfill and Compact
  • Use infill or approved on-site soils to fill in any additional areas behind the wall rock. The stair tread area must be level with the top of the base course of blocks.
  • Use a plate compactor to compact the wall rock starting directly behind the block and working in a path parallel to the wall, working from the back of the block, over the stair tread area, to the back of the excavated area. Always compact in 8in. (200 mm) lifts or less.
          		Install next stair riser
Install wall out from stairs
Install First Stair Riser
  • Measure the distance for the placement of the first stair riser making sure that the blocks are parallel with the base course in front. Place the blocks on top of the compacted stair tread area making sure to allow for 6 in. (150 mm) of wall rock behind the blocks.
  • To ensure that the blocks will be level with the corresponding wall, place a block on the wall as a reference point and level from that block to the block being used for the stair treads.
  • Level and adjust as necessary.
  • To curve the wall out from the stair location, break the wings off the backs of blocks and place them tight together, following the layout on your approved plans.

Backfill and Compact
  • Fill in the area in front of the first stair riser with a small amount of wall rock. This will keep the blocks from shifting while filling and compacting.
  • Fill the hollow cores and at least 12 in. (300 mm) behind the blocks or enough to accommodate the next stair riser with wall rock.
  • Then compact and level the wall rock as previously done.
 Back fill and compact
Additional Steps
  • Repeat these steps for each stair riser.
  • Once all the steps are in place, install the selected stair tread material to finish your stairway.

For more information click here for Page 1.
For more information click here for Page 2.


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