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How To Waterproof A Concrete Basement Floor?


Picture of  Richard Greig

Richard Greig

Richard joined the Aquatech family in early 2022. He brings over 15 years of experience with him in the foundation repair and waterproofing trade. Learn More About Richard Greig

Waterproofing your concrete basement floor is a critical step to protect your home from water damage, mold growth, and structural issues. Aquatech Waterproofing provides a comprehensive guide and professional services to ensure your basement stays dry and secure. Here’s how to waterproof your basement floor effectively!

Step 1: Choose the Right Sealant

Selecting the appropriate sealant is crucial. Aquatech offers various options based on your basement’s specific needs:

  • Acrylic Sealer: Opt for basements with light foot traffic and minimal harsh exposure.
  • Epoxy Sealant: Ideal for floors in workshops or garages where grease and heavy use are common.
  • Polyurethane Sealer: Provides flexibility and UV protection, suitable for both indoors and outdoors.
  • Siloxane Sealant: Best for exterior surfaces needing deep penetration and long-lasting protection.

Step 2: Prepare the Surface

Before applying any sealant, it’s essential to clean the concrete thoroughly. Remove any debris, dirt, or grease that might prevent the sealant from adhering correctly. Consider professional cleaning services to ensure the best results.

Step 3: Repair Cracks and Damage

Use concrete repair caulk to fill in any cracks or holes in the surface. Once the caulk is dry, sand it down to create a smooth, even surface. Ensuring all damages are properly repaired is key to effective waterproofing.

Step 4: Apply the Sealant

Once the surface is prepared, apply your chosen sealant according to the manufacturer’s instructions. This may include brushing, rolling, or spraying the sealant evenly across the concrete. 

Ensure proper ventilation during application and allow sufficient drying time.

Signs Your Concrete Basement Floor Needs Waterproofing

Spotting potential water issues in your basement early can save you a world of trouble. From the blatant to the barely noticeable, here are key indicators that it’s time to think about waterproofing your concrete basement floor:

  • Persistent Dampness: Even without visible puddles, a perpetually damp floor suggests moisture seepage.
  • Unpleasant Smells: A persistent musty smell often hints at hidden mold growth due to moisture.
  • Efflorescence: Keep an eye out for a powdery, white residue on floors or walls. This is efflorescence, caused by water evaporation leaving mineral deposits behind.
  • Water Marks on Walls or Floor: Stains or discoloration on surfaces signal past water trouble.
  • Condensation: Regular condensation on windows, pipes, or ductwork indicates excessive basement humidity.
  • Rusty Appliances: Signs of rust on your water heater or other metal objects in the basement can be a clue to ambient moisture problems.

DIY vs. Professional Concrete Basement Waterproofing

When water threatens to breach your basement’s defenses, it’s crucial to weigh the options between tackling the job yourself and calling in the professionals. Here’s a breakdown to help guide your decision:

DIY Waterproofing

DIY Waterproofing

  • Cost-Effective: Handling the waterproofing yourself can save on labor costs.
  • Immediate Action: You can start the project on your timeline without waiting for a professional’s availability.

DIY Waterproofing

  • Complex Challenges: Identifying and effectively addressing all sources of water intrusion can be difficult without extensive expertise.
  • Temporary Fixes: DIY solutions might not address the root cause, leading to potential future water issues.
  • Risk of Incorrect Application: Misapplying waterproofing materials can lead to further damage and expenses.

Professional Waterproofing


  • Expert Diagnosis: Professionals can accurately identify all water entry points and underlying issues, ensuring a comprehensive solution.
  • Long-Term Solutions: Armed with the right tools and materials, experts provide lasting waterproofing solutions rather than temporary fixes.
  • Guarantee and Peace of Mind: Many professional services come with a warranty, giving you confidence in the durability of the work.


  • Cost: The initial outlay for professional services is higher than DIY, but it’s an investment in long-term protection.
  • Scheduling: You may need to work within the professional’s schedule, which might not align perfectly with yours.

Tips to Save on Concrete Basement Waterproofing

  1. Catch It Early: Deal with moisture problems as soon as you spot them to avoid bigger, costlier repairs later.
  2. Use DIY for Small Jobs: Apply sealants or waterproof paints yourself for minor dampness issues.
  3. Compare Quotes: Don’t settle for the first contractor; get various estimates to ensure you’re getting a good deal.
  1. Prevent Water Build-Up: Make sure your home’s exterior is diverting water away effectively with proper gutter and landscape management.
  2. Invest in Quality: Opting for durable solutions might cost more upfront but saves money by preventing future issues.

Say Goodbye To Wet Basements With Aquatech Waterproofing!

Our experts can turn a leaky or flooded basement into a dry and happy place. We don’t just fix leaks; we make sure your home stays safe and sound for a long time. Want to keep your basement dry? Call Aquatech Waterproofing and let us help protect your home!

FAQs on Waterproofing A Concrete Basement Floor

Generally, a properly applied waterproofing treatment can last several years, but it’s wise to inspect your basement floor annually for any signs of wear or moisture ingress. The need for re-application depends on the condition of the waterproofing layer and the level of moisture exposure the basement receives.

For minor dampness and preventative measures, DIY solutions like sealants or waterproofing paint might be sufficient. However, for persistent moisture problems or visible water infiltration, it’s recommended to consult a professional. They can provide a comprehensive assessment and long-lasting solutions.

Several effective methods include sealants, epoxy injections for cracks, membrane installations, and interior drainage systems. The best method depends on your basement’s specific conditions, such as existing moisture levels and vulnerability to water intrusion.

Yes, by preventing moisture from entering your basement, waterproofing significantly reduces the risk of mold and mildew growth, which thrive in damp conditions. However, adequate ventilation and humidity control are also crucial to prevent air moisture from fostering mold development.