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  1. #1
    Join Date
    Feb 2008
    Location
    Aust
    Posts
    192

    Default Exterior cladding - best flushing product?

    I noticed there is a few knowledgeable people here on board and flushing.

    I'm trying to find a solution for boarding/claddding timber ( pine ) stud frame then trowel texture coating the board to exterior.

    Everywhere I look these days there seems to be fractures straight down the texture at the board joins. What causes this?

    What is the best board product and method of flushing for texture coating over?

    Thanks in advance
    c2=a2+b2;
    When buildings made with lime are subjected to small movements thay are more likely to develop many fine cracks than the individual large cracks which occur in stiffer cement-bound buildings. Water penetration can dissolve the 'free' lime and transport it. As the water evaporates, this lime is deposited and begins to heal the cracks. This process is called autogenous healing.

  2. #2
    Join Date
    May 2003
    Location
    Kuranda, paradise, North Qld
    Age
    63
    Posts
    2,026

    Default

    Never used it myself, but I'd be checking out Hardie's site for fixing and flushing specs for their Harditex product (blue board). I'd assume that if used per specifications you wouldn't have any cracking problems. On a related subject, a mate of mine is a painter and render applicator (has about 20 blokes working for him) and he uses a lot of Quickwall"s product without any dramas.

    Mick
    "If you need a machine today and don't buy it,

    tomorrow you will have paid for it and not have it."

    - Henry Ford 1938

  3. #3
    Join Date
    Feb 2008
    Location
    Aust
    Posts
    192

    Default

    Thanks JM

    The Quickwall product looks alright.
    c2=a2+b2;
    When buildings made with lime are subjected to small movements thay are more likely to develop many fine cracks than the individual large cracks which occur in stiffer cement-bound buildings. Water penetration can dissolve the 'free' lime and transport it. As the water evaporates, this lime is deposited and begins to heal the cracks. This process is called autogenous healing.

  4. #4
    Join Date
    Feb 2008
    Location
    Aust
    Posts
    192

    Default

    James Hardie are saying its up to the texture manufacturer to supply the flushing technology.

    Weird
    c2=a2+b2;
    When buildings made with lime are subjected to small movements thay are more likely to develop many fine cracks than the individual large cracks which occur in stiffer cement-bound buildings. Water penetration can dissolve the 'free' lime and transport it. As the water evaporates, this lime is deposited and begins to heal the cracks. This process is called autogenous healing.

  5. #5
    Join Date
    Feb 2007
    Location
    Sydney
    Posts
    87

    Default

    I'm in the process of cladding an external laundry with harditex and plan on using the rockcote textured system.

  6. #6
    Join Date
    Feb 2008
    Location
    Aust
    Posts
    192

    Default

    rockcote
    Is this to the external walls Emptybucketman?

    Its a roll on?

    I have done plenty of Texture before on rendered brick walls but never boarded.

    I really need to flush the board prior to trowel on or

    a. The join will definitely crack
    b. Its very hard to get a consistent finish over the joins

    Ive asked a couple of Gyprock guys but their work has cracked. Ill have to speak to the texture head honchos to see what they recommend.

    thanks, found this
    http://www.rockcote.com.au/technical/polyrender.html

    it blows me away that hardies don't supply the whole solution...
    c2=a2+b2;
    When buildings made with lime are subjected to small movements thay are more likely to develop many fine cracks than the individual large cracks which occur in stiffer cement-bound buildings. Water penetration can dissolve the 'free' lime and transport it. As the water evaporates, this lime is deposited and begins to heal the cracks. This process is called autogenous healing.

  7. #7
    Join Date
    May 2007
    Location
    Albury
    Posts
    11

    Default

    Rockcote have a product for board joints which is flexible and should not crack.

    Rockcote Coarse Patch & Fibre Patch.
    "Rockcote Coarse Patch & Fibre Patch are flexible, low-shrink patching compounds suitable for setting the joints between cement sheeting"

    I suggest the patch first in the joints and then the polymer render over the lot.

  8. #8
    Join Date
    Jun 2006
    Location
    melbourne
    Posts
    77

    Default

    hello,

    I think the issue comes down to a couple of things:

    1. you never get blueboard fixed to specs, mostly the no. of nails is poor on people's jobs

    2. i think the mesh needs to be bedded into the render (polymer/patch whatever) ie. render is applied to rebate and then mesh "bedded" in, this is rarely done, similar with styrene the mesh comes sticky and is stuck on then rendered over

    3. you need to do rebates and wall in basically one homogenous run ie. all together, also use the same render to do any further levelling/float coats, use the same render

    sure it might cost more but in the long run whats better

    you will find the joint area isnt cracked but the outer coat for instance will be

    myla

  9. #9
    Join Date
    Feb 2008
    Location
    nsw
    Posts
    73

    Default

    i would give the whole blue board thing a miss... im working for a extension builder at the moment and we only use insuclad or unitex systems now - after numerous call backs to fix cracking blue board, the set joints in blue board cant cope with shrinkage/swellage.

    with these foam systems you fix plywood to ya stud wall then fix the foam boards to this then apply yer texture finish with mesh laid in it. havent seen any problems with it yet, another benifit is that it gives a reveal at windows and doors which makes it look more look real brickwork. the foam also gives thermal benefits aswell

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