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  1. #1
    Join Date
    Sep 2006
    Location
    Sydney
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    1

    Default Cracking - Blue Board join movement or render problem?

    G'day,

    Looking at buying a house with cracking evident in the render appearing in the blue board joins. Appears to be a rendering issue but not 100%. Anyone know of a blue board manufacturer or who's responsible for meshing the joints before applying the render? Is it the builders job to seal the joints before rendering or the renders?

  2. #2
    Join Date
    Jul 2004
    Location
    Sale
    Age
    69
    Posts
    559

    Default

    Does it matter? The last thing I would be doing is buying someone else's problem. There is a correct way to fit blueboard with a gap and filler which is as important as the tape. Some builders get the joins a bit tight which causes cracking. It's an easy fix, pull off blue board, refix new sheet and replaster. All you need is very deep pockets, looking for the cause to asertain liability is something the vendor should be doing.

  3. #3
    Join Date
    Jan 2006
    Location
    Melbourne
    Posts
    722

    Default

    Hi Monaro, there seem to be a lot of problems around similar to what you are desribing, so I would have thought a call to a rendering company would tell you if there are any long term fixes that are any good.

    I agree with JohnC, you'll end up stuck with the problem and pursuing a builder to fix it will probably be as much work as doing it yourself.

    Just find out whats involved, maybe someone has come up with a brilliant wonder product to fix it.

  4. #4
    Join Date
    Aug 2005
    Location
    Victoria
    Posts
    412

    Default

    Quote Originally Posted by johnc View Post
    Does it matter? The last thing I would be doing is buying someone else's problem. There is a correct way to fit blueboard with a gap and filler which is as important as the tape. Some builders get the joins a bit tight which causes cracking. It's an easy fix, pull off blue board, refix new sheet and replaster. All you need is very deep pockets, looking for the cause to asertain liability is something the vendor should be doing.
    While I agree that blueboard should not be tight against other surfaces or internal corners,the proper way to install the sheets is that there should not be ANY gap left between them.

    Tools

  5. #5
    Join Date
    Nov 2001
    Location
    Parkside - South Australia
    Age
    46
    Posts
    479

    Default

    Blueboard + Render = Cheap job.

    Not often that you see a classy house clad with blueboard.
    Cheap, quick & easy. Looks good for a few years, helps with the sale and keeping the price down and then it looks shocking.
    Now proudly sponsored by Binford Tools. Be sure to check out the Binford 6100 - available now at any good tool retailer.

  6. #6
    Join Date
    Jun 2006
    Location
    melbourne
    Posts
    77

    Default

    hello,

    quick fix is to seal with sikaflex and repaint (2 coats), this an easy fix, keep sealant to a minimum on sides of crack

    whole lot could be re-rendered with appropriate meshing and render ($40/bag stuff)

    why blueboard cops it I dont know, am know currently patching/fixing a lot of polystyrene sheet clad houses where washers are coming through, angles peeling off, cracks etc

    when rendering blueboard I believe best to use "patch" render for joint with mesh and then skim whole wall with "patch" and mesh again wider than original

    doesnt take much longer but definitely holds up

    thankyou
    myla

  7. #7
    Join Date
    Jul 2006
    Location
    Melbourne
    Posts
    675

    Default

    Blue board cracks because fibre glass mesh tape just doesn't cut it.

    Mind you the manufactures have not come up with a better jointing solution yet.

    I have blueboard on my own house that has the odd hairline crack as well.

    Even villaboard will develope cracks if fibreglass mesh tape is used. Paper tape is the only answer for villaboard but I can't see it being used externally with the resin jointing compounds.

    Come up with practical solution and you will make money!! (Maybe a hemp tape is the answer? It is stronger than fibre glass!)

    Cheers

    Rod Dyson
    Great plastering tips at
    www.how2plaster.com

  8. #8
    Join Date
    Apr 2006
    Location
    sydney
    Posts
    10

    Default

    Rod you've got me worried about this mesh not being good enough, i'm going to texture coat a blueboard job(complete house)and have bought a couple of rolls of this mesh tape. You mention about the tape, but maybe the resin compound might be a problem,i went wattle paint shop they had the tape and an external joint filler that you mix, is that what you by resin compoun and if so would this be the way to go?

  9. #9
    Join Date
    Apr 2006
    Location
    sydney
    Posts
    10

    Default

    myla, you said skim whole wall with patch and mesh again,do you put the mesh first then skim wall?Joe.
    Quote Originally Posted by myla View Post
    hello,

    quick fix is to seal with sikaflex and repaint (2 coats), this an easy fix, keep sealant to a minimum on sides of crack

    whole lot could be re-rendered with appropriate meshing and render ($40/bag stuff)

    why blueboard cops it I dont know, am know currently patching/fixing a lot of polystyrene sheet clad houses where washers are coming through, angles peeling off, cracks etc

    when rendering blueboard I believe best to use "patch" render for joint with mesh and then skim whole wall with "patch" and mesh again wider than original

    doesnt take much longer but definitely holds up

    thankyou
    myla

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