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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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General: Drying damp in a wall

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  1.  
    • CommentAuthormarsaday
    • CommentTimeMay 7th 2022
     
    The ground floor flat in a block of 3 flats has has an issue with damp over the years. It was treated in 2008 on the communal wall. The damp is back it seems and i think i have solved the issue. The downpipe for the roof feeds into a blocked gully. More importantly this origional gully (130 yrs old i think had no bottom.

    The the water entered the gully and then drained away out through the outlet. This probably blocked up over 20 yrs ago as it had a big holly tree root growing in it.

    I have swapped out the damaged gully and a bit of clay pipe for new plastic so all good now.

    The damp wall now has salt coming out. So am i right in thinking the wall is drying if the salts are now showing through ?

    If so what is the best course of action. I know we need to take off the plaster and recoat with a salt blocking plaster, but do we wait a year or do we just go ahead and do it now. The wall is not offending anyone or causing a visual issue.
    • CommentAuthortony
    • CommentTimeMay 7th 2022
     
    I would wait six months for sure, how thick is the wall? Lime or cement mortar?

    Strip wall now, keep air free to circulate, the salts will most likely be sodium nitrate, white crystals.

    Ensure fully dry before replastering
    • CommentAuthormarsaday
    • CommentTimeMay 7th 2022
     
    I think the wall is double brick skin. It will be lime mortar, but this area was damp treated in 2008 and so it has had a new plaster base applied. What ever these damp compnaies use. I dont think it is a gympsum base.
    • CommentAuthortony
    • CommentTimeMay 7th 2022
     
    I would hack it all off, it is likely waterproof and sealing damp into the wall

    Best thing is to let the brickwork dry out
    • CommentAuthormarsaday
    • CommentTimeMay 8th 2022
     
    Ok thanks Tony
    •  
      CommentAuthorfostertom
    • CommentTimeMay 9th 2022
     
    Posted By: tonyI would wait six months
    for six months of summer, to be precise!
  7.  
    I think you'll wait more than 6 months for 6 months of Summer!!

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