What started as one U.K. homeowner's plan to "repair the broken joist and relay the floor" quickly turned into something far more serious.
Here's what to know
Photos the homeowner posted to Reddit's r/DIYUK showed what they found after lifting part of the floor.
"The only thing holding this door up was the laminate," they wrote. "85% of it was dust. Every joist snapped with 0 pressure on it."
In the comments, the poster said their "get out of jail card" was that "this needed doing anyway, and a professional would've cost about £6000 [nearly $8,000]."
One commenter joked, "Relay the floor. Sell the house. Agree never to speak of it again."
More background
One commenter said that the issue was "dry rot / lack of adequate ventilation in the floor void," adding, "You'll need to install new joists and floorboards whilst ensuring adequate ventilation and air flow."
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A possible reason emerged when the poster said two of the home's three air bricks had been blocked before being cleared. From there, much of the discussion focused on moisture getting trapped beneath old floors when underfloor airflow is poor.
The thread also prompted stories from others whose small repair jobs grew into full-scale projects. One commenter said their son had bought a basement apartment with a floor "rotten as Hell," and that once they tore it out, they ended up redoing "All 100sq.m of it" and "changing everything…."
Humor kept running through the thread. One commenter called it a "Brave choice to leave the things on the cabinet and windowsills etc while doing that," while another joked that it looked like "Tom has chased Jerry with a hammer."
What can be done?
Once the damage had been exposed, simply covering it back up was no longer an option.
Based on the discussion, the clearest path forward was to replace the damaged joists and floorboards, especially if limited ventilation had let the decay spread beneath the surface.
Restoring airflow under the house was also part of that response. The poster said two of the three air bricks were blocked when they checked, and that clearing them was an immediate step meant to ventilate the void again.
Where can I learn more?
These other home stories show how problems can hide beneath the floor — and what people do once they find them.
• One homeowner tackled fleas in hardwood floors while trying to protect six pets.
• A cleaning expert said black tea revived hardwood without reaching for harsher products.
• Scientists warned common construction materials may leave microplastics in human blood vessels.
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