Inside vs. Outside Basement Waterproofing: Strategies from Rain Away Waterproofing Experts

At Rain Away Waterproofing, we understand that keeping your basement dry isn’t just a preventative step—it’s a crucial investment in the stability and health of your entire home. With over 15 years of expertise, we provide nuanced, tailored solutions for basement waterproofing that address both internal and external threats to your home’s foundation.

The Importance of a Dry Basement

Maintaining a dry basement is essential for more than just comfort; it’s about safeguarding the foundation that supports your entire home. Here’s why prioritizing a moisture-free basement is critical:

  • Structural Health: Moisture can be a major adversary for a home’s foundation, leading to significant structural damage.
  • Health and Safety: Damp environments foster the growth of mold and mildew, which can pose serious health risks.
  • Utility and Value: A dry basement is versatile, usable space that increases property value.

Deciding Between Internal and External Waterproofing Methods

Choosing the right waterproofing approach can depend on various factors including the existing condition of your basement, geographic location, and budget. At Rain Away Waterproofing, we specialize in comprehensive assessments to determine the best strategy tailored to each unique situation.

Interior Waterproofing Solutions

  • Sealants and Coatings: These are applied directly to your basement walls and floors to block moisture infiltration.
  • Sump Pumps and Drains: These systems are installed inside the basement to manage and redirect water away from your home.

Discover more about our interior waterproofing solutions.

Exterior Waterproofing Solutions

  • Proper Drainage Systems: Ensuring water flows away from your foundation is crucial, and may involve regrading your landscape or improving your gutter system.
  • Waterproof Barriers: We apply specialized membranes along the exterior basement walls to resist external water pressure and prevent moisture from entering.

Discover more about our exterior waterproofing solutions.

Below is a table summarizing the main highlights of deciding between interior and exterior basement waterproofing methods


Exterior Waterproofing

Interior Waterproofing


Sealing the home from the outside, involving a trench around the house down to the foundation.

Waterproofing from the inside using a water drainage track and a sump pump.


1. Prevents water from entering the basement.

1. Less expensive and less disruptive.

2. Quick installation (takes a day or two).

3. Easy to fix and service.

4. Effective at waterproofing.


1. Expensive and time-consuming.

2. Damages landscaping or hardscaping.

3. Not serviceable without significant rework.

Requires moving stored items away from walls; basement unavailable during installation.

Method Type

Preventative solution

Corrective solution


Creates a barrier preventing water entry

Redirects water that enters the basement

Installation Impact

Disruptive, affects landscaping and requires significant digging

Non-disruptive to exterior, no need to dig up yard


High due to extensive labor and groundwork

Lower cost due to less labor-intensive work

Both methods are effective in keeping water out, but the choice largely depends on whether prevention or correction of water ingress is desired, and the budget available for the project. Make sure to choose a reliable and experienced contractor for whichever method you decide.

Cost-Effectiveness and Efficiency

At Rain Away Waterproofing, we pride ourselves on providing solutions that are both efficient and economical. We understand the importance of a long-term investment in your home and aim to provide services that offer the best balance of cost and effectiveness.

Comparative Cost Analysis of Exterior vs. Interior Basement Waterproofing in Ontario

Cost Factor

Exterior Waterproofing

Interior Waterproofing

Initial Installation

$150 – $250 per linear foot (average)

$40 – $100 per linear foot (average)

Average Total Cost

$20,000 to $30,000 for a typical home

$5,000 to $15,000 for a typical home


Long-term solution, but more expensive

Effective but might require maintenance


High (landscaping, excavations, etc.)

Low (mostly interior work)

Maintenance & Repairs

Difficult and costly; redoing might require similar expenses as initial installation

Easier and less costly, accessible for repairs


  1. Exterior Waterproofing: This method involves extensive excavation and preparation, which adds significant labor and material costs. Especially in Ontario, where weather conditions can complicate extensive outdoor work, the costs can be at the higher end.
  2. Interior Waterproofing: This is generally less expensive as it involves less invasive procedures, fewer materials, and less labor compared to exterior methods. It is favored for being less disruptive to daily life and the property’s exterior landscape or structures.

Keep in mind prices can vary significantly by contractor and specific project requirements. It’s crucial to get multiple quotes and understand the full scope of what’s included in the price. Additionally, consider the long-term benefits and potential necessity for future maintenance or reapplications when choosing the best method for your needs.

Our Proven Track Record

Year after year, our team completes over 400 projects successfully, attesting to our profound commitment and expertise. From smaller residential cases to large-scale commercial projects, Rain Away Waterproofing stands as a leader in the industry.

Client Testimonials

Hear directly from those who have experienced the Rain Away difference. Our client testimonials highlight the satisfaction and security that our services have brought to homeowners throughout Ottawa.

Ready to Protect Your Home? Contact Us Today!

Don’t delay in addressing potential water damage. Contact Rain Away Waterproofing for a free, detailed consultation to explore both internal and external waterproofing options. Our experienced team is ready to tailor a solution specific to the needs of your home.

Learn more about us and our innovative strategies for keeping your basement dry and functional. Visit us online or reach out directly to discover why Rain Away Waterproofing is the trusted choice for comprehensive moisture protection in Ottawa.

FAQs About Basement Waterproofing at Rain Away