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This guide will walk you through why rot happens, how to assess the damage, and the step-by-step process to make your window look and function like new. Wood rot is caused by fungus. That fungus needs three things to thrive: moisture, oxygen, and temperatures above 50°F (10°C) . Since windows are constantly exposed to rain, condensation, and sun (which breaks down paint), they are ground zero for rot. window rotted wood repair
There’s a sinking feeling every homeowner knows: you go to open a stuck window, press on the sill, and your finger goes right through the wood. Rot. It’s a dirty word in home maintenance, but when it comes to wooden windows, it’s not a death sentence. Have a rot repair story or question
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Before you call a replacement window company for a $1,500+ quote, know this: Wood rot is caused by fungus
| Damage Level | Action | |--------------|--------| | (less than 1/4” deep, localized) | Sand, treat, and use wood hardener + filler. | | Moderate rot (through one layer, but not structural) | Cut out rotted section; splice in new wood or use epoxy. | | Severe rot (rotten through the entire sash or frame, structural joints disintegrating) | Replace the window. Epoxy can’t rebuild missing joinery. |
Rotted window wood is intimidating, but it’s one of the most satisfying DIY repairs you can do. Take your time, use real epoxy (not cheap filler), and you’ll buy your windows another decade of life. And your wallet will thank you.