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  1. #1
    Join Date
    Oct 2012
    Posts
    4

    Default Crack in old plaster

    I have a home built in 1929 and with the intense summer heat, a crack appeared in the plaster. How should I fix? Thanks

  2. #2
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,503

    Default Re: Crack in old plaster

    1- Where is the crack?

    2- Is there vertical displacement? - can you slide something across it and hit a lip?

    3- is the crack vertical? Horizontal or at a 45 angle?

    4- How many cracks are there?

    5- is there a corresponding crack on the other side of the same wall?

  3. #3
    Join Date
    Jun 2009
    Posts
    271

    Default Re: Crack in old plaster

    Houston Remodeler has some very good questions.
    After 70 years and than you have a crack develope I would think it would be a structural problem ( movement ).
    Cracks in plaster have many causes but I think you can rule out Internal Stress , Deflection crack as this type crack would have many off shoots.A warped stud crack would be vertical and have small off shoots. All other types off cracking in plaster would have occured many years ago.

  4. #4
    Join Date
    Oct 2012
    Posts
    4

    Default Re: Crack in old plaster

    Thanks for reply. The message board won't let me post pictures. I would really like some better input based upon the photos. I can email them or leave my email. Thanks, Jay

  5. #5
    Join Date
    Mar 2008
    Location
    nova scotia, canada
    Posts
    1,522

    Default Re: Crack in old plaster

    where in the house is the crack, is there a floor above. the heat doesnt make much sense.. but if its the main floor ceiling or on the top floor and you had your roof redone it wouldnt surprise me.. if something heavy was dropped the impact can cause the plaster to crack
    fire up the saw and make some dust

  6. #6
    Join Date
    Oct 2012
    Posts
    4

    Default Re: Crack in old plaster

    The crack is in a "nook" extending from the house. Crawl below it - roof replaced 5+ years ago. We had the hottest/driest summer in history. House built in '29

  7. #7
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    5,436

    Default Re: Crack in old plaster

    I don't think it's heat related.
    Is the crack wider than 1/4"?

    Also, try to answer some of the questions we are asking - we are trying to help you!

  8. #8
    Join Date
    Oct 2012
    Posts
    4

    Default Re: Crack in old plaster

    1- Where is the crack?

    2- Is there vertical displacement? - can you slide something across it and hit a lip?

    3- is the crack vertical? Horizontal or at a 45 angle?

    4- How many cracks are there?

    5- is there a corresponding crack on the other side of the same wall?
    __________________

    The crack is about 45 and is less then 1/4" One main crack and some splinters next to window - hairline crack extends upward
    The board won't allow me to upload pics. Says they're invalid - I reduced there size. Im a mac user

  9. #9
    Join Date
    Jun 2009
    Posts
    271

    Default Re: Crack in old plaster

    I would say based on that explaination that it is a RACKING CRACK
    these are caused by structural movement.
    These type cracks are directional and move in almost a straight line with very short off shoots, all the off shoots will come off the main crack at about a 45 degree angle and pointed in the same direction.Any crack larger than 1/16 of an inch would be structural.
    The off shoots will not get to the 1/16" more like hair line cracks.

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