Selecting the Best Waterproofing Method for Lowered Basements

Protecting your home from water damage, mould, and structural issues is essential after lowering your basement. Choosing the right basement waterproofing method can be a daunting task, but with the right information, you can make an informed decision. In this comprehensive guide, we will discuss the various basement waterproofing methods, their benefits, and how to choose the right one based on your specific needs and foundation type.

The Relevance of Basement Lowering to Waterproofing

Lowering a basement, also known as underpinning, involves increasing the depth of your basement to add more living space or address structural issues. This process can affect the integrity of your foundation, making it more susceptible to water infiltration. As a result, choosing the appropriate waterproofing method is crucial to ensure the long-term protection of your home.

Types of Basement Waterproofing Methods

Interior Waterproofing

Interior waterproofing methods are applied from inside the basement, focusing on preventing water seepage and managing water that has already penetrated the foundation. Common interior waterproofing methods include:

Sealants: Waterproof sealants, such as epoxy or polyurethane injections, are used to fill cracks and gaps in the foundation, preventing water from seeping in. Popular products include Sika Crack Fix and RadonSeal Concrete Foundation Crack Repair Kit, which cost between $70-$100 per kit.
Waterproof Coatings: Waterproof coatings, like cementitious or silicate-based coatings, are applied to the interior walls and floor to create a watertight barrier. Drylok and Kryton are well-known brands that offer products ranging from $30-$60 per gallon.
Interior Drainage Systems: An interior drainage system, like a French drain or perimeter drain, collects water that has entered the basement and channels it to a sump pump, which expels the water outside. These systems typically cost between $2,000 and $6,000, depending on the size of your basement and the complexity of the installation.

Exterior Waterproofing

Exterior waterproofing methods are applied outside the basement, addressing the root cause of water infiltration by directing water away from the foundation. Popular exterior waterproofing methods include:

Exterior Drainage Systems: Exterior drainage systems, such as French drains or footing drains – weeping tile, divert water away from the foundation to prevent seepage. These systems can cost anywhere from $120 to $300 per linear foot of the foundation wall, depending on the size of your property and the installation complexity.
Waterproof Membranes: Waterproof membranes, like rubber or plastic sheeting, are applied to the exterior walls of the basement to create a barrier against water intrusion. Brands like Delta or Bakor offer products ranging from $130-$250 per 65 foot long roll.
Dampproofing: Dampproofing involves applying a water-resistant coating, such as BlueSeal or AquaBloc or bitumen, to the exterior walls to prevent moisture penetration.

Water Management Systems

Water management systems control the flow of water around and through the foundation, ensuring that water doesn’t accumulate and cause damage. Common water management methods include:

Gutters and Downspouts: Properly functioning gutters and downspouts are crucial for directing rainwater away from the foundation, reducing the risk of basement flooding. Regular maintenance and repair of gutters and downspouts are essential to their effectiveness.
Grading: Grading the soil around your foundation with a slope away from your home, ensures that water drains away from the foundation, preventing seepage. Grading costs depend on the size of your property and the complexity of the project but typically range from $1,000 to $3,000.

Choosing the Right Waterproofing Method After Lowering

Evaluate Your Basement’s Needs: Assess your basement’s unique needs by identifying the source of water infiltration, the extent of the water damage, and the type of foundation your home has, such as concrete, stone, or brick. Different foundation materials may require specific waterproofing methods or products.
Consider the Cost and Time Involved: Different waterproofing methods have varying costs and time requirements. Be sure to factor in the cost of labour, materials, and any necessary repairs when making your decision. Keep in mind that investing in a more expensive method may save you money in the long run by providing better protection against water damage.
Consult with a Waterproofing Professional: It’s always a good idea to consult with a waterproofing professional who can provide expert advice and guidance. They can assess your specific situation and recommend the most effective waterproofing method for your needs.
Weigh the Pros and Cons of Each Method: Carefully consider the advantages and disadvantages of each waterproofing method, including its effectiveness, durability, and maintenance requirements. This will help you make an informed decision that best suits your needs and budget.
Use a Decision-Making Framework: To help you evaluate your own situation and choose the most suitable waterproofing method, consider using a decision-making framework. This can be as simple as a checklist or a more detailed matrix that compares factors like cost, effectiveness, and potential long-term savings.

Conclusion

Choosing the right basement waterproofing method after lowering is crucial for maintaining a healthy, dry, and structurally sound home. By evaluating your basement’s needs, considering the cost and time involved, consulting with a professional, and weighing the pros and cons of each method, you can make an informed decision that will protect your home from water damage for years to come. Invest in quality waterproofing solutions to ensure the safety and longevity of your living space.

Basement Underpinning FAQ

Most frequent questions and answers

What is the difference between interior and exterior basement waterproofing methods?

Interior waterproofing methods focus on preventing water seepage and managing water that has already penetrated the foundation from inside the basement. Exterior waterproofing methods, on the other hand, address the root cause of water infiltration by directing water away from the foundation outside the basement. Both methods have their own advantages and can be used in combination for comprehensive protection against water damage.

How much does it typically cost to waterproof a basement after lowering?

The cost of waterproofing a basement after lowering can vary greatly depending on the chosen method, the size of your basement, and the complexity of the installation. Interior waterproofing methods like crack injection can cost between $70-$100 per kit or per gallon for sealants and coatings, while interior drainage systems range from $70 to $100 per linear foot. Exterior waterproofing methods can cost anywhere from $120 to $per linear foot for drainage systems, $130-$250 per roll for waterproof membranes, and $150 to $250 for dampproofing. Additional costs may include repairs, and consultations with professionals.

Can I waterproof my basement myself, or do I need to hire a professional?

While some DIY waterproofing methods, such as applying sealants or coatings, can be done by homeowners with some experience in home repairs, more complex methods, like installing drainage systems or applying waterproof membranes, typically require the expertise of a professional waterproofing contractor. Consulting with a professional can also help ensure you choose the most effective waterproofing method for your specific situation.

How do I know which waterproofing method is best for my lowered basement?

To choose the best waterproofing method for your lowered basement, evaluate your basement’s unique needs by identifying the source of water infiltration, the extent of the water damage, and the type of foundation your home has. Consider factors like cost, effectiveness, durability, and maintenance requirements. It’s also a good idea to consult with a waterproofing professional who can provide expert advice and guidance.

Is it necessary to waterproof my basement after lowering?

Yes, waterproofing your basement after lowering is crucial for maintaining a healthy, dry, and structurally sound home. Lowering a basement can affect the integrity of your foundation, making it more susceptible to water infiltration. Proper waterproofing helps protect your home from water damage, mould growth, and structural issues, ensuring the safety and longevity of your living space.