Basements are incredibly useful spaces — whether you're turning yours into a rental unit, a rec room, or extra storage. But because they're below ground, they’re more prone to moisture issues. Left untreated, this can lead to mold, odours, and even structural damage.
The solution? Proper waterproofing. With the right materials and techniques, you can keep your basement clean, dry, and functional for years to come.
Why Basement Waterproofing Matters
Even small cracks in your foundation or poor drainage can allow moisture into your basement. Over time, this can cause:
Waterproofing protects your investment and ensures a healthier, safer environment.
5 Steps to Waterproofing Your Basement Floor
1. Fix the Source of Moisture
Start by identifying where the moisture is coming from. Common sources include:
If your basement has flooded before, consider installing a sump pump or an interior drainage system.
2. Choose the Right Flooring
Some flooring materials — like carpet, hardwood, or laminate — absorb moisture and degrade over time. Instead, choose Porcelain or Ceramic Tiles. These are:
Even the best tiles need proper prep. Apply a waterproof membrane or sealant to the subfloor before installation. This adds a moisture barrier and helps prevent long-term issues.
You’ll also need quality adhesives, cement, grout, and sealers to ensure a solid and lasting finish.
3. Seal the Grout
Grout lines are often overlooked, but they can let moisture seep through. After your tiles are installed, apply a grout sealer — and reapply every 1–2 years for continued protection.
4. Control Humidity
Even with waterproof flooring, a humid basement can still feel damp. Use a dehumidifier and make sure your space is well-ventilated. Keeping humidity below 50% helps prevent mold and preserves your floor.
Turning Your Basement into a Rental?
If your goal is to create a livable or income-generating space, waterproofing is a crucial first step. It lays the foundation for a healthy, durable, and comfortable environment — especially important for tenants.
For more renovation tips, check out:
10 Essential Considerations When Renting Out Basements in Ontario
