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Estimation Tools
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- Round up on all approximations to ensure you have enough material.
- Pay attention to the units of measurement.
- See Frequently Asked Questions for more helpful hints.
Decorative Rock, Sand and Class 5 Material:
Recommended Depth
- Decorative Rock: 3”-6” (size dependent)
- Drainage Rock: 6”+
- Patio Class 5 Base: 6”+
- Patio Sand Layer: 1”
Coverage (Rock 1 ½” or less)
1 cubic yard covers approximately
- 324 sq. ft. at a 1” depth
- 108 sq. ft. at a 3” depth
- 81 sq. ft. at a 4” depth
- 54 sq. ft. at a 6” depth
(1 ½” rock or less in size)
Wood Mulch, Black Dirt, and Fill Dirt Material:
Recommended Depth
- Soil base for sod: 3”+
- Soil base for seed: 3”+
- Perennial Garden Topping: 3”
Retaining Wall Backfill:
Recommendations
- If you have a 3 foot high wall, use 12”+ of backfill
- If the wall is higher than 4 feet, geo-grid is needed to reinforce the weight.
- Without proper drainage, hydrostatic pressure will build up and cause the wall to bulge or crack.
- When soil is less permeable, an increased amount of backfill is recommended.
Retaining Wall Block & Patio Pavers:
Please call or email us to inquire about estimation help with a Retaining Wall structure or Patio Paver project. It would be helpful to have a clear mental image of what you are hoping to achieve as well as all measurements and slope changes to relay.
Fieldstone, Boulders and Outcropping:
Please call or email us to inquire about estimation help with fieldstone boulders or outcropping projects. Be prepared to share what sizes of boulders you are planning to use and the projected length and height of each wall. It would be helpful to have a clear mental image of what you are hoping to achieve as well as all measurements and slope changes to relay.