Basement flooding in Ottawa spiked after the city’s July 1st, 2026 storm dropped roughly 118 mm of rain in under two hours, more than double the previous Canada Day rainfall record. The City of Ottawa has received over 5,300 reports of basement flooding, with more than 4,500 basements affected across the city. If your basement took on water, you are far from alone, and there are real steps you can take once the cleanup starts.
What Happened During the Storm
The storm hit Ottawa on Canada Day afternoon, with the heaviest rain falling between about 2 p.m. and 7 p.m. Winds reached roughly 70 km/h, and tens of thousands of Hydro Ottawa customers lost power at the peak of the storm. City officials have said the property damage from this storm is more than double what Ottawa saw during the 2019 Ottawa River flood. Some areas of the city may also qualify for provincial disaster assistance through the Disaster Recovery Assistance for Ontarians (DRAO) program, though eligibility is area-specific and worth checking directly.
For many homeowners, the immediate priority is drying out and cleaning up. Once that work is done, a lot of people start asking whether an epoxy or polyaspartic coating can help protect their basement floor going forward. Here is look at what these coatings can and cannot do.
Can Epoxy or Polyaspartic Coatings Help With Water Damage?
Yes, but it helps to understand what “help” actually means here. Epoxy and polyaspartic coatings create a seamless, non-porous surface that seals bare concrete. That surface resists water, salt, and staining much better than untreated concrete, and it makes future cleanup faster and easier if water ever gets in again.
What a coating will not do is stop water from pushing up through the slab or in through foundation walls under hydrostatic pressure. A floor coating is a surface-level solution. It is not a substitute for exterior waterproofing, a sump pump, proper grading, or fixing the cracks that let water in during this storm. Any contractor who tells you a coating alone will “flood proof” your basement is not giving you the full picture, and we would rather be upfront about that.
What a Coating Does Well After a Flood
Once the water source is under control, a properly installed coating offers real, practical benefits for a basement that has been through a flood:
- Less porous concrete. Bare concrete soaks up water and holds onto moisture. A sealed floor sheds water instead of absorbing it, which cuts down on the damp conditions that mold and mildew need to grow.
- Faster cleanup next time. A smooth, seamless surface is much easier to mop, disinfect, and dry than bare or painted concrete.
- Better resistance to staining. Flood water often carries sediment, salt, and debris. A quality coating resists staining far better than raw concrete.
- Long-term durability. A properly installed epoxy or polyaspartic system can last years with normal care.
Get a Free Estimate for Your Basement
If your basement was affected by the July 1st storm and you want to talk through your options, our team is here to help. Fill out the form below and we will follow up to arrange a free, no-obligation quote.
What a Coating Can’t Fix on Its Own
Before any coating goes down, the real cause of the flooding needs to be addressed. That usually means:
- Repairing cracks in the slab or foundation walls where water got in
- Making sure a sump pump is installed and working, if the home doesn’t already have one
- Checking that grading and downspouts are directing water away from the foundation
- Confirming the slab is fully dry before any coating is applied
We offer concrete and crack repair as part of our basement prep work, since skipping this step is one of the most common reasons a coating fails down the road.
Why Now Is a Good Time to Coat Your Basement Floor
If your basement flooded, there is a decent chance the flooring, baseboards, or lower drywall have already been removed to dry things out. That is actually a good window to deal with the concrete itself. Cracks are exposed, the slab can be tested for moisture, and the floor can be properly ground and prepped before you put the room back together. Doing this now, rather than after new flooring goes back down, saves you from tearing everything out again later.
What to Do First If Your Basement Flooded
- Remove standing water and start drying the space with fans, dehumidifiers, and good airflow. Don’t rush this step.
- Address the water source, whether that is a crack, a failed sump pump, or grading around the foundation.
- Let the slab dry out fully. Concrete needs to reach an acceptable moisture level before any coating is applied, or the coating can bubble and fail. A professional installer can test this for you.
- Get the concrete prepped and coated once it’s dry and the underlying issue is fixed.
Frequently Asked Questions
Is epoxy flooring waterproof?
Epoxy and polyaspartic coatings are highly water-resistant on the surface and seal the concrete below. They are not a waterproofing system on their own and won’t stop water pushing up from underneath the slab or through foundation walls.
Can I coat a basement floor that just flooded?
Not right away. The slab needs to dry out completely and test at an acceptable moisture level first. Coating over a damp slab is one of the most common causes of coating failure.
How long should a basement floor dry before coating?
It depends on the extent of the flooding and drying conditions, but it is often several weeks. A moisture assessment, not a calendar, is what determines when the slab is ready. Our concrete coatings installers can help with this.
Does epoxy flooring prevent future flooding?
No. It protects the concrete surface and makes cleanup easier, but it does not replace waterproofing, sump pumps, or foundation repair.
How much does basement epoxy flooring cost in Ottawa?
Cost depends on the size of the space, the condition of the concrete, and the coating system you choose. We provide free, no-obligation quotes so you can get an accurate number for your basement.