How To Waterproof A Block Foundation From The Exterior With 8 Steps

Waterproofing a block foundation from the exterior is a crucial undertaking to protect your home from water infiltration and moisture-related issues. Block foundations are commonly found in many homes and require specialized techniques to ensure effective waterproofing. In this comprehensive guide, we will walk you through the step-by-step process of how to waterproof a block foundation from the exterior. By following these steps, you can create a moisture-resistant barrier that safeguards your home’s structural integrity and durability.

Step 1: Site Assessment and Preparation

Before beginning the waterproofing process, assess the condition of the block foundation. Look for cracks, gaps, and areas of deterioration in the blocks. Address any issues by repairing and patching the damaged areas using appropriate sealants and repair compounds. Thoroughly clean the foundation surface to remove dirt, debris, and any existing coatings.

Step 2: Excavation and Exposing the Foundation

Create an excavation trench around the perimeter of the foundation to expose the exterior surface of the block foundation. The trench should extend below the frost line to ensure proper protection against freeze-thaw cycles. Exercise caution to avoid damaging utility lines and other structures during excavation.

Step 3: Surface Cleaning and Preparation

Clean the exposed block foundation surface using a pressure washer to remove dirt, dust, and loose particles. Ensure the surface is smooth and even, with no protrusions or irregularities that could hinder the application of waterproofing materials.

Step 4: Application of Waterproofing Membrane

Apply a high-quality waterproofing membrane to the cleaned block foundation surface. Waterproofing membranes are available in various forms, such as liquid-applied and sheet membranes. Roll or brush on the liquid membrane, or adhere the sheet membrane as per manufacturer instructions. Overlap the edges of the sheet membrane to create a continuous barrier.

Step 5: Protection Board Installation

Install protection boards over the applied waterproofing membrane to shield it from damage during backfilling. Protection boards are rigid panels that provide a protective layer against soil pressure and debris. Secure the protection boards in place using appropriate fasteners.

Step 6: Backfilling and Compaction

With the protection boards in place, carefully backfill the excavation trench with soil. Compact the soil in layers to ensure stability and prevent settling. Gradually backfill the trench while monitoring the protection boards to prevent displacement.

Step 7: Grading and Drainage

Ensure that the grading around your home slopes away from the foundation to encourage proper drainage. This prevents water from pooling against the block foundation and minimizes the risk of water infiltration. A functional gutter and downspout system should direct rainwater away from the foundation.

Step 8: Restoration of Landscaping

After completing the waterproofing process, restore the landscaping around your home. Replant vegetation, lay sod, or apply mulch as desired. Maintain consistent grading to ensure effective drainage away from the block foundation.

Benefits of Exterior Block Foundation Waterproofing

There are multiple benefits of exterior block foundation waterproofing:

  • Longevity: Properly waterproofed block foundations can last for decades, preserving the structural integrity of your home.
  • Moisture Protection: Exterior waterproofing shields block foundations from water infiltration, preventing moisture-related damage and mold growth.
  • Energy Efficiency: A dry foundation contributes to better insulation and reduced energy loss, enhancing overall energy efficiency.
  • Property Value: Well-maintained and waterproofed block foundations enhance the value of your property.

Waterproofing a block foundation from the exterior is a crucial step to protect your home from water-related issues. By following this step-by-step guide, you can create a durable and moisture-resistant barrier that ensures the long-lasting integrity of your property. Effective block foundation waterproofing not only safeguards your investment but also provides peace of mind, knowing that your home is well-prepared to withstand the challenges of moisture and the elements.