With professional extraction and drying equipment, most flooded basements in the GTA are dry in 3 to 5 days. Without it, the same basement can stay wet for weeks — long enough for mould to start in 24 to 48 hours.
Typical drying times
| Situation | Typical time with pro equipment |
|---|---|
| Unfinished basement, concrete floor, clean water | 2 – 3 days |
| Finished basement, carpet and drywall, clean water | 3 – 4 days |
| Finished basement, sewer backup (materials removed) | 3 – 5 days after tear-out |
| Hardwood or engineered flooring | 5 – 10 days, sometimes more |
| Concrete slab after a deep flood | Can take 1 – 2 weeks |
What affects drying time
- How fast water is extracted. Every litre pulled out with a truck-mount or extractor is a litre the dehumidifiers don't have to remove.
- What's wet. Carpet pad and drywall below the water line are usually removed; that actually speeds drying of the structure behind.
- Equipment and airflow. Air movers across wet surfaces plus commercial LGR dehumidifiers, sized to the room following IICRC S500.
- Outdoor conditions. Humid GTA summers slow drying if windows are left open; a closed, dehumidified space dries faster.
How "dry" is measured
Dry isn't a feeling. A technician takes moisture readings of the wet materials and compares them with unaffected materials in the same home (the drying goal). Readings are logged every day. Equipment comes out when the goal is reached — not before, and not days after.
Mistakes that lead to mould
- Turning the furnace up to "dry it out" — heat without dehumidification spreads moisture.
- Leaving wet carpet pad or drywall in place.
- Stopping fans when the surface feels dry but the wall cavity is still wet.
- Waiting for the adjuster before starting. Your policy requires you to prevent further damage; take photos and start.
See a real setup in our basement project, read why GTA basements flood, or check what water damage restoration costs.
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