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Chimney clean out continues to fill with water

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William B. says:

Hello, I purchesed a new home last year ( Built in 2011) and for some reason the chimney clean out continues to fill with water, even after pumping out the water and vacuuning the excess, it continues to fill, what could be the cause, Thank You.
asked in House Chimney by darekrudy (21,730 points)
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1 Answer

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Hi William,

There might be a few reasons responsible for chimney clean out filling up with water, the following are the most common;

  1. The chimney is clogged and exhaust gasses are condensing on its interior walls causing flooding. If it’s a straight chimney, put a mirror into the clean-out and check if you can see the light / top of the chimney opening.
  2. Heavy rains & missing rain cap on the top of the chimney or poorly installed flashing (top of the chimney and roof area).
  3. Chimney foundation / underground walls problem (assuming that this clean-out is below the ground level). The underground wall / foundation section might be cracked or depending on the material (bricks, cinder blocks) separating on joints and leaking ground water. This could be associated with poorly designed drainage around your property.


answered by darekrudy (21,730 points)