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damp in bathroom in annex

Discussion in 'General DIY' started by Boofle28, 20 Jun 2021.

  1. Boofle28

    Boofle28

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    Evening, about 6 months ago I noticed rising damp in the annex bathroom (single storey flatroof) i found the walls were wet about waist height and it had run up through the floor in the next room causing the carpet to get mouldy. I did place a dismantled shed against the exterior wall for some very rainy months (cornwall) and as soon as I removed the shed from the wall the rising damp went down and got better. But after ripping the annex apart removing plaster/tiles ect it's done some damage and still feels damp loeer to the floor in areas behind tiles ect but not as bad as It was! See attached pics.. appretiate peoples thoughts. In the pics the radiator and pipes are fine (not leaking) and that wall is backed onto the garage the external wall where the shed was up against was the wall on the left.
    Dan
     

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  3. JohnD

    JohnD

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    you say it is an annexe bathroom.

    Are the walls made of brick? Or lightweight foamed concrete block (which is very absorbent)

    What makes you think the pipes are not leaking?

    Is the floor concrete?

    Can you peel back the floor covering and see if it is wet?

    Are there pipes buried in the floor?

    please show some photos of the outside. Include the gutters, downpipes, the foot of the wall at ground level, and the drains.

    p.s.
    it is not rising damp.
     
  4. Boofle28

    Boofle28

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    Thanks for your reply,
    Walls are made of brick.
    My heating system is fairly new and is not losing pressure, they run straight through into the garage. And the damp has come down since I removed the shed panels from leaning against the exterior wall possibly has come through the sink waste pipe which I have sealed again from the outside.

    The floor is concrete yes. The floor is also tiled which I am in process of lifting the tiles off.
    There is also water pipes running through the floor for the sink shower and toilet.
    See pic attached of outside wall.
     

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  5. Boofle28

    Boofle28

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    What makes you say this is not rising damp also?
    Dan
     
  6. JohnD

    JohnD

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    because it looks like a leak.

    It's very common for pipes buried in or under a concrete floor to leak.
     
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  8. Boofle28

    Boofle28

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    I agree...
    But the issue has got much better and looks as if its drying over the past 6 month or so.
    This photo was in the last 2 month or so.. if there was a pipe leaking in the ground I would like to think the tide mark will still be as high as it was?
     

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  9. foxhole

    foxhole

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    Shed had caused penetrating damp , if wall was soaked could take over 12months to dry depending on weather .
     
  10. wgt52

    wgt52

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    I'd say the shed panels leaning against the wall stopped it drying out naturally. Brickwork, especially old, soft bricks can hold surprising amounts of water.
     
  11. Boofle28

    Boofle28

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    I agree.. its ran accross under the floor also causing the floor to be damp and then up the stud wall in the middle of the room.. dp you think this can happen? If its breached the dpc?
     
  12. Boofle28

    Boofle28

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    Just taking up bathroom tiles and found a trail of damp floor.. it leads to the toilet pipe.. but I would expect alot more water if it was leaking? Thoughts?
     

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