Unilock Wall Block, 3" Sierra 3 Pc Random Bundle Estate Wall | EW-STD3-SR

Key Features

• Connection - features channels on top and bottom of each stone which are connected using a small insert provided with the system
• Recommended base stabilization one layer of DriveGrid™ stabilization grid between subgrade and base material
• Standard base - minimum 6 to 8 in. of 3/4 in. crusher run gravel (any road base standard in accordance with ASTM-D2940) compacted to 98% standard proctor density (SPD)
• Alternative permeable base - minimum 6 to 8 in. of 3/4 in. clear open-graded stone compacted to achieve full particle lock up and consolidation
• Levelling - levelling retaining wall blocks directly on top of gravel is tedious and generally does not yield the best results