How to Waterproof Basement Exterior
Learn how to waterproof basement exterior 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: Excavate Around Foundation
Step 1: Excavate Around Foundation
Dig trench 3-4 feet wide down to footer, expose entire foundation wall needing waterproofing.
Mini Excavator Rental
Compact excavator for digging around foundation (per day)
2 Step 2: Clean and Repair Foundation Wall
Step 2: Clean and Repair Foundation Wall
Pressure wash wall, repair cracks with hydraulic cement, let cure 24 hours.
Hydraulic Cement
Fast-setting cement for repairing foundation cracks
Wire Brush
Brush for cleaning foundation wall
3 Step 3: Apply Waterproof Membrane
Step 3: Apply Waterproof Membrane
Brush or roll waterproofing tar/membrane onto wall from footer to grade level.
Foundation Waterproofing Tar
Asphalt-based waterproofing for foundation (5 gallon)
Paint Roller and Tray
Roller for applying waterproofing membrane
4 Step 4: Install Drainage Board
Step 4: Install Drainage Board
Attach dimpled drainage board over waterproofing to protect membrane and channel water.
Foundation Drainage Board
Dimpled plastic sheeting for exterior drainage (4x8 sheet)
5 Step 5: Install or Repair Footer Drain
Step 5: Install or Repair Footer Drain
Place perforated drain pipe at footer level in gravel bed, slope to daylight or sump.
Perforated Drain Pipe
4-inch perforated pipe for foundation drainage (10 feet)
Drainage Gravel
Washed stone for surrounding drain pipe (per ton)
6 Step 6: Backfill and Grade Away
Step 6: Backfill and Grade Away
Backfill trench with soil, slope grade 6 inches over 10 feet away from foundation.
Fill Dirt
Clean fill for backfilling excavation (per cubic yard)