07/14/2026
This is what a floor drain sewage backup did to a subfloor in just a few days. π³ This Toronto homeowner had no idea it was happening.
The mushrooms are the part that really gets people's attention β and they should. Fungi fruiting like this doesn't happen from a quick spill. It means the wood was thoroughly saturated. It's possible there was some moisture in this area before this event too, just never noticed, which could explain how things progressed so fast once the drain backed up.
Floor drains in furnace rooms are easy to forget about until something goes wrong. If it's been a while since anyone checked yours, it's worth a look.
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