How to Build Retaining Wall
Learn how to build retaining wall with our detailed step-by-step guide. Follow our easy instructions to get it done right.
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0 of 6 steps completedStep-by-Step Instructions
1 Step 1: Plan Wall Height and Check Codes
Step 1: Plan Wall Height and Check Codes
Walls over 4 feet typically require permit and engineering - check local codes.
Retaining Wall Building Guide
Book on designing and building retaining walls
2 Step 2: Excavate and Create Base
Step 2: Excavate and Create Base
Dig trench 6 inches deep and 6 inches wider than blocks, add gravel base.
Crushed Gravel
Base gravel for retaining wall foundation (per ton)
3 Step 3: Level and Compact Base
Step 3: Level and Compact Base
Spread and compact gravel, make perfectly level - critical for entire wall.
Plate Compactor Rental
Compactor for packing gravel base (per day)
4-Foot Level
Level for checking wall base and blocks
4 Step 4: Lay First Course of Blocks
Step 4: Lay First Course of Blocks
Place first row on gravel, check level front-to-back and end-to-end continuously.
Retaining Wall Blocks
Interlocking blocks for wall construction (each)
5 Step 5: Stack Additional Courses
Step 5: Stack Additional Courses
Offset joints, use pins or adhesive per manufacturer, backfill and compact each row.
Wall Block Adhesive
Construction adhesive for bonding wall blocks
Wall Block Pins
Fiberglass pins for securing wall courses (box)
6 Step 6: Cap Wall and Install Drainage
Step 6: Cap Wall and Install Drainage
Install cap blocks on top, add drainage pipe behind wall, backfill with gravel.
Wall Cap Blocks
Flat cap stones for finishing retaining wall (each)
Perforated Drain Pipe
4-inch pipe for wall drainage (10 feet)