10/09/2026
What Happens When Downspouts Can’t Handle Heavy Rain? - Ontario Downspout Service https://ontariodownspoutservice.com/what-happens-when-downspouts-cant-handle-heavy-rain/
When downspouts can’t handle heavy rain, water backs up in your eavestrough system and overflows directly onto your foundation, leading to basement leaks, foundation damage, soil erosion, and potential structural problems. Undersized or overwhelmed downspouts create a bottleneck in your drainage system—water enters your gutters faster than the downspouts can discharge it, forcing overflow exactly where it causes the most damage. For Toronto homeowners facing increasingly intense storms, downspout capacity has become a critical concern.
When downspouts can’t handle heavy rain, water backs up in [...]