Your back door is likely leaking water because of rotting in the door or its frame, or warping that has created gaps.
Here's a more detailed breakdown of potential causes:
Common Causes of Back Door Leaks:
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Rotting Wood: Wood doors and frames are susceptible to rot, especially if exposed to moisture. This rot can create pathways for water to enter.
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Warped Door or Frame: Temperature changes and humidity can cause the door or frame to warp, leading to gaps that allow water to seep through.
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Damaged or Missing Weather Stripping: Weather stripping around the door creates a seal. If it's damaged, worn, or missing, water can easily leak through.
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Improper Sealing: The area where the door frame meets the wall needs to be properly sealed. Cracks or deteriorated sealant can allow water to penetrate.
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Incorrect Door Installation: If the door wasn't installed correctly, it may not be properly sealed, leading to leaks.
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Drainage Issues: Water accumulating outside the door due to poor drainage can increase the likelihood of leaks. This includes clogged gutters or improper grading.
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Damaged Threshold: The threshold (the piece at the bottom of the door frame) can deteriorate, creating a path for water intrusion.
Troubleshooting and Solutions:
- Inspect the Door and Frame: Look for signs of rot, warping, cracks, and damage.
- Check the Weather Stripping: Ensure it's in good condition and properly installed. Replace if necessary.
- Examine the Sealant: Check the sealant around the door frame and re-caulk if needed.
- Assess Drainage: Make sure water is draining away from the door. Clean gutters and address any grading issues.
- Consider Professional Help: If the problem is severe or you're unsure how to fix it, consult a professional door installer or contractor.
