Scott Stone : Products : Navastone : Stack 'n' Go : Construction Guide

These are a series of questions to ask yourself that will make designing the retaining wall easier. Scott Stone will also use this information to provide you with an estimate of materials and price.

Q: How High?

The height of your wall needs to include at least one buried base course, not just what's above ground. Missing the base course could make a big difference in calculation of material requirements and the price!

Q: Does the height vary?

If the property has a slope, the wall height may vary accordingly. For example, you may have a 30' long wall that starts at only 2' high, but ends at 3'. To make estimating easier, break up your wall into sections. Allow each section to step up or down always maintaining a minimum of 1 course below grade.

Q: Will the wall be terraced?

If so, the upper wall must be distanced from the lower wall by at least 1.5 times the height of the lower wall, H1. The distance, D, is measured from the front of the upper wall, H2, to the rear of the lower wall's footing. The distance D, is a minimum design parameter.

Q: Do I have a grade plan?

When a home is constructed, a grade plan is usually produced for the owner. Check your records, you probably have one which illustrates exactly how your land's grade changes. Then just map your wall onto a copy of the plan.

Q: What setback do I need?

Wallstone systems can accommodate several setbacks. Generally, setback walls can go higher than vertical walls. Setback walls tend to use less product.

Step 2

TOOLS YOU WILL NEED

Shovel. Chisel, Hammer, String, Level, Stakes, Straight Edge, Wheelbarrow, Compactor, Butyl Tape or Landscape Adhesive, Base and Backfill Materials (crushed granular aggregate with gradation size from 3/4" stones to fine sand.)

Step 3

EXCAVATION & LEVELING BASE PREPARATION

Excavate a trench for base course to minimum depth of 200mm (8") below finished grade or to firm soil. The trench width should be a minimum of 300mm (12"). Spread a minimum 100mm (4") of crusher run gravel in the trench, leveling and compacting it to provide a firm base.
Leveling Tip: Place screeding guides approximately 100mm (4") below the final grade. Fill with the base material and screed to level.

Step 4

BASE COURSE & WALL CONSTRUCTION

Set a straight laying line by simply snapping a chalk line or laying a string line on the laying bed. Start placing standard pieces at an outside corner or at the lowest grade point.

Heights to 600mm (24")

Check your alignment and leveling of the base course* and adjust if necessary. Continue laying blocks as per engineered drawings. (The multiple-groove feature allows for varied setbacks.) Consult engineering drawings if required. To ensure aesthetic appeal, we recommend a minimum joint overlap of 1/4 bond. Repeat for all the remaining courses. Backfill behind the wall with granular as you go after every 2 courses, compacting the backfill in 100mm (4") layers.

* A minimum of one course below grade is always required. The module used in the base may vary depending on design.

Step 5

COPING INSTALLATION

Lastly, place the coping units. The multi-groove feature allows placement in multiple positions for a special finishing touch. Butyl tape or landscape adhesive should be applied in two continuous beads along the outer edge of each tongue to secure the coping to the previous course.

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For More Information call: 800-649-8782

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