The back door was replaced about a year ago, and the bottom of the jamb now looks dark and worn. The caulk also looks rough. How can I tell whether it is actual rot, and what should I check before repairing it?
Could this door jamb really be rotting after just a year?
Asked by VelvetKite
Answers
First check the wood itself, not just the color. If it feels firm and a small probe does not sink in easily, it may be surface discoloration or unfinished primer rather than rot. If it is soft, crumbly, or damp, take that more seriously. Clean it, let it dry, then use the right primer and exterior paint if the jamb is sound.
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Before adding more caulk, figure out how water is reaching that spot. Check the door trim, sill, and flashing for gaps or signs of water getting behind them. Caulk can help at the right joints, but avoid covering any openings meant to drain. If the jamb is genuinely soft or the area stays wet, a surface patch will not fix the cause.
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Since the replacement was recent, take clear photos and contact the installer or seller before cutting anything out. Ask them to inspect the jamb and the way the sill and exterior trim were finished. The appearance alone is not enough to say the installation was wrong, but a prompt inspection may help distinguish a paint-maintenance issue from water intrusion.
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