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Crack in ceiling plaster at Apex.

  • 03-11-2009 12:20PM
    #1
    PaddyThai
    Closed Accounts Posts: 62 ✭✭


    I should know what to do but I don't.

    Have a roof where ceiling goes all the way to the ridge. At the ridge there is a 100mm horizontal piece of plasterboard. The joints between this and the sloped plasterboard are finished with tape and jointing compound. Cracks have apperaed along the line of the joints. I previously opened up the cracks with a wide screwdriver and filled with flexible decorators caulk. In the past I have found this to work and once painted over no cracks are seen.

    However, in this case cracks have re-appeared and I am looking for a more permanent solution.

    Any ideas??


Comments

  • #2
    mickdw
    Registered Users, Registered Users 2 Posts: 23,812 ✭✭✭✭mickdw


    The plaster board is probably fixed to the underside of the ridge at this location and possibly the edges that are cracking have no timber supports behind the joints so the joint is relying on the rigidity of the plasterboard and the jointing tape.
    I would rip off that 100mm wide horizontal strip, screw fix tapered battens (tapered so that the underside of the batten will sit horizontal to fit slab onto) along each edge and fix new plasterboard to these battens, possibly not contacting the underside of the ridge at all. I cant see the joint cracking again then although you will have to get the plastering right again after this work


  • #3
    PaddyThai
    Closed Accounts Posts: 62 ✭✭PaddyThai


    Hadn't considered that.
    A lot of worjk but I can see how it would be a solid job.
    Are you a plasterer?

    Appreciate advice, thanks.


  • #4
    mfceiling
    Registered Users, Registered Users 2 Posts: 12,973 ✭✭✭✭mfceiling


    You could try opening the crack slightly then a double layer of scrim cloth on it with a decent coat of bonding on it then a finish coat of skim or jointing compound.


  • #5
    mickdw
    Registered Users, Registered Users 2 Posts: 23,812 ✭✭✭✭mickdw


    PaddyThai wrote: »
    Hadn't considered that.
    A lot of worjk but I can see how it would be a solid job.
    Are you a plasterer?

    Appreciate advice, thanks.

    No, Im an Engineer. That is what I would be advising as proper fix.


  • #6
    Kricket
    Closed Accounts Posts: 27 ✭Kricket


    HI Guys, where you have a vaulted ceiling with no structural collars you will always have trouble with cracks unless you over speced on rafters and it would depend on the span of the build and length of rafters to determan what would be required.


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  • #7
    mickdw
    Registered Users, Registered Users 2 Posts: 23,812 ✭✭✭✭mickdw


    You might have a point but I was assuming that all was well structurally.
    Are we sure there are no collars used here? In many cases, the collar are there and form part of the feature of the roof.


  • #8
    PaddyThai
    Closed Accounts Posts: 62 ✭✭PaddyThai


    No collars.

    Rafters go up to Apex (ridge).

    Might have to cut back plasterboard about 300mm below ridge along slope. Put in 4" x 2" screwed to raftes. Fix plasterboard to this and skim.

    The problem with this is trying to get good joint between new horizontal skim and sloped ceiling existing plaster. Might have to use jointing compound as it sands down to feather edge.

    Thanks for all advice above.


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