Installation Instructions

RETAINING WALLS

Tiered Denver and Clifton walls oer a visually pleasing and less obtrusive alternative to

conventional wall construction. On sites that provide sucient land area for this application, these

walls are typically designed with green space between the tiers.

Walls perform independently and may not need engineering when the distance between gravity

walls is at least two times the height of the lower wall, and the height of the upper wall is equal to

or less than the height of the lower wall (known as the 2 to 1 rule). Walls that must be evaluated

by an engineer are any walls needing geogrid reinforcement. These include walls closer than two

times the height of the lower wall, walls with more than two terraces, and terraced walls with any

structures above. Terraced walls that do not perform independently based on the 2 to 1 rule listed

above must also be evaluated for global stability, and the lower wall must be designed to resist the

load of the upper wall.

TIERED WALLS

Cap Block

nished Grade

Varies

Clifton Block

6°

6”

6” Minimum Compacted

Granular-Base

Leveling Pad

4” ø Drain Tile (Elev. Varies)

12” of Free Draining Aggregate

1st Layer

2nd Layer

Other Layers

24”

4” ø Drain Tile (Elev. Varies)

4” ø Drain

Tile (Ele

Varies)