Cementitious Waterproofing

• 1). Purchase waterproofing cement and acrylic additive from a masonry supply store. The acrylic additive serves to improve the bond between the cement and the concrete.
  
  
• 2). Dry the entire surface of the concrete foundation that you wish to waterproof. A propane torch is effective for such a job.
  
  
• 3). Scrape off any loose material that is on the surface of the foundation.
  
  
• 4). Add the waterproofing cement to an industrial-sized pail.
  
  
• 5). Add water to the pail. Pour in twice as much water as there is cement in the pail.
  
  
• 6). Stir the acrylic additive into the cement mixture with a long-handled brush.
  
  
• 7). Brush the waterproofing cement mixture on the surface of the concrete. A single coating of cement creates a durable water barrier.
  
  

Liquid Waterproofing

• 1). Purchase a liquid waterproofing product at a hardware store.
  
  
• 2). Dry the entire surface of the concrete foundation that you wish to waterproof. A propane torch is effective for such a job.
  
  
• 3). Scrape off any loose material that is on the surface of the foundation.
  
  
• 4). Apply the liquid waterproofing product evenly to the surface of the concrete foundation using a paint roller.
  
  
• 5). Apply a second coating of liquid waterproofing product to the foundation. Cover the foundation with at least 2.3 inches of liquid membrane to form a waterproof seal.