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Thread: ceiling cracks

  1. #1
    Join Date
    Feb 2008
    Posts
    4

    Default ceiling cracks

    with cold weather ceiling splits from wall.House is on slab and it is happening throughout the house.Is this a serious structural problem and how to fix it ?

  2. #2
    Join Date
    Feb 2008
    Posts
    1

    Default Re: ceiling cracks

    I have the same problem with the joint of the wall and ceiling on my two-story home. It seems to be peeling at the drywall tape.

    Can anyone help?

  3. #3
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: ceiling cracks

    Perhaps this may have something to do with it.


    I'm not familiar as to how cold it gets in your area but there is phenomenon that occurs in this area where it gets does get very cold.

    This phenomenon is well documented with builders across North America and has been labeled as "Truss Uplift".... although the cause is subject to speculation.

    There are plenty of discussions between builders and suppliers regarding "Truss Uplift" .... here's the short of the long.

    Truss uplift is a fairly recent discovery since modern homes are mainly built using pre-manufactured web trusses for the roof system. Usually the effects can be noises and/or gaps between the partition wall drywall and the ceiling drywall. Typically this gap will open and close with seasonal changes to the outside temperature.

    There is still speculation as to the the cause of truss uplift and the actual mechanics are not fully known .... but it is believed to be due to the design of the trusses.

    Modern trusses are designed to incorporate triangular webs that are built with dimensional lumber held together with metal plates. Using the properties of the wood , these triangles create very strong structural components which minimizes the overall weight of the trusses.

    The most current and widely accepted theory is ...... the temperature and humidity changes in the attic during the winter months affect different sections of the truss differently.

    The area of the truss above the insulation will be subject to different temperature and humidity levels than the bottom cord buried deep in the insulation. This difference causes the upper cords of the truss to expand and contract in the cool winter while the bottom cord remains fairly static. This results in an upward bowing of the bottom cord because it is securely connected to the top cords.

    The result of this differential movement is the center section of the bottom cord moves upward pulling on the interior wall or simply separating the the drywall and leaving gaps where they join at the ceiling.






    Hopefully this makes sense and helps.

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